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XSS CHEAT SHEET
XSS Cheat Sheet. This 32-page booklet includes 100+ Cross-Site Scripting payloads and techniques with clear directions in several possible scenarios to help you with modern XSS. Sample here. Table of Contents: 1. Basics. 2. Advanced. 3. CSP BYPASS GUIDELINES CSP Bypass Guidelines. March 8, 2021. March 8, 2021. Brute The Art of XSS Payload Building. Content Security Policy (CSP) is the last line of defense against the exploitation of a XSS vulnerability. When correctly implemented, it seems to be extremely effective in doing so (nowadays). Here we will deal with the possible ways to abuse flaws inDOM-BASED XSS
The most common type of XSS (Cross-Site Scripting) is source-based. It means that injected JavaScript code comes from server side to execute in client side. But there’s another main type, the DOM-based one, where injected malicious input does not come from server via reflected or stored means: XSS is generated in client side by native Continue reading DOM-based XSS – The 3 SinksXSS 101 - BRUTE XSS
1. What is XSS? Cross-site scripting (XSS) is both the name of the most common vulnerability in web applications and the exploitation method performed against it. XSS attacks abuse the dynamic way websites interact with their clients, the browsers. It makes possible, for an attacker, to control the victim’s browser and his/her interaction with a Continue reading XSS 101 THE GENESIS OF AN XSS WORM The greatest danger of a cross-site scripting (XSS) vulnerability is the possibility of spreading from user to user of an application until the whole user system get infected. Such code capable of doing that is what we call an XSS worm. In order to better understand how this digital creature works, we will start a Continue reading The Genesis of an XSS Worm – Part I XSS VIA HTTP HEADERS In some cases, an information passed in one of the HTTP headers of the application is not correctly sanitized and it’s outputted somewhere in the requested page or in another end, giving rise to a XSS situation. But unfortunately, once an attacker can’t make a victim to edit his/her own HTTP headers in an actual Continue reading XSS viaHTTP Headers
XSS PAYLOAD SCHEME
XSS Cheat Sheet. The best Cross-Site Scripting collection out there! Tested Proof-of-Concept vectors and payloads. Covers basics to advanced, filter bypass and other cases.XSS AND RCE
XSS and RCE. May 9, 2016. May 9, 2016. Brute The Art of XSS Payload Building. RCE (Remote Code Execution) is a critical vulnerability which usually is the final goal of an attack. With code execution, it’s possible to compromise servers, clients and entire networks. XSS, as many other vulnerabilities, is a step towards to it, even ifpeople
XSS TEST PAGE BY BRUTE LOGIC XSS Test by @brutelogic Hello, guest! Find user profile providing oneor more below:
BRUTE XSS - MASTER THE ART OF CROSS SITE SCRIPTING. The Art of XSS Payload Building. Testing for Cross-Site Scripting (XSS) might seem easy at first sight, with several hacking tools automating this process. But regardless of how tests to find a XSS are performed, automated or manually, here we will see a step-by-step procedure to try to find most of the XSS cases out there.XSS CHEAT SHEET
XSS Cheat Sheet. This 32-page booklet includes 100+ Cross-Site Scripting payloads and techniques with clear directions in several possible scenarios to help you with modern XSS. Sample here. Table of Contents: 1. Basics. 2. Advanced. 3. CSP BYPASS GUIDELINES CSP Bypass Guidelines. March 8, 2021. March 8, 2021. Brute The Art of XSS Payload Building. Content Security Policy (CSP) is the last line of defense against the exploitation of a XSS vulnerability. When correctly implemented, it seems to be extremely effective in doing so (nowadays). Here we will deal with the possible ways to abuse flaws inDOM-BASED XSS
The most common type of XSS (Cross-Site Scripting) is source-based. It means that injected JavaScript code comes from server side to execute in client side. But there’s another main type, the DOM-based one, where injected malicious input does not come from server via reflected or stored means: XSS is generated in client side by native Continue reading DOM-based XSS – The 3 SinksXSS 101 - BRUTE XSS
1. What is XSS? Cross-site scripting (XSS) is both the name of the most common vulnerability in web applications and the exploitation method performed against it. XSS attacks abuse the dynamic way websites interact with their clients, the browsers. It makes possible, for an attacker, to control the victim’s browser and his/her interaction with a Continue reading XSS 101 THE GENESIS OF AN XSS WORM The greatest danger of a cross-site scripting (XSS) vulnerability is the possibility of spreading from user to user of an application until the whole user system get infected. Such code capable of doing that is what we call an XSS worm. In order to better understand how this digital creature works, we will start a Continue reading The Genesis of an XSS Worm – Part I XSS VIA HTTP HEADERS In some cases, an information passed in one of the HTTP headers of the application is not correctly sanitized and it’s outputted somewhere in the requested page or in another end, giving rise to a XSS situation. But unfortunately, once an attacker can’t make a victim to edit his/her own HTTP headers in an actual Continue reading XSS viaHTTP Headers
XSS PAYLOAD SCHEME
XSS Cheat Sheet. The best Cross-Site Scripting collection out there! Tested Proof-of-Concept vectors and payloads. Covers basics to advanced, filter bypass and other cases.XSS AND RCE
XSS and RCE. May 9, 2016. May 9, 2016. Brute The Art of XSS Payload Building. RCE (Remote Code Execution) is a critical vulnerability which usually is the final goal of an attack. With code execution, it’s possible to compromise servers, clients and entire networks. XSS, as many other vulnerabilities, is a step towards to it, even ifpeople
XSS TEST PAGE BY BRUTE LOGIC XSS Test by @brutelogic Hello, guest! Find user profile providing oneor more below:
XSS CHEAT SHEET
XSS Cheat Sheet. This 32-page booklet includes 100+ Cross-Site Scripting payloads and techniques with clear directions in several possible scenarios to help you with modern XSS. Sample here. Table of Contents: 1. Basics. 2. Advanced. 3.XSS 101 - BRUTE XSS
1. What is XSS? Cross-site scripting (XSS) is both the name of the most common vulnerability in web applications and the exploitation method performed against it. XSS attacks abuse the dynamic way websites interact with their clients, the browsers. It makes possible, for an attacker, to control the victim’s browser and his/her interaction with a Continue reading XSS 101LEVERAGING SELF-XSS
Leveraging Self-XSS. April 2, 2016. April 14, 2020. Brute The Art of XSS Payload Building. Self-XSS is a curious case of cross-site scripting: an attacker is able to execute code in the browser, but only he/she can do it. No link to share, no common place to be visited by someone else in case of a stored flaw (like in restrictedprofiles).
XSS PAYLOAD SCHEME
XSS Cheat Sheet. The best Cross-Site Scripting collection out there! Tested Proof-of-Concept vectors and payloads. Covers basics to advanced, filter bypass and other cases. MULTI REFLECTION XSS When finding XSS in websites usually we see more than one reflection of our input in source code which can be very useful to bypass several types of filters. Let’s start with a very simple way to know how many reflections we may have with the same payload: Example: French Wikipedia Website => Continue reading Multi Reflection XSS TESTING FOR XSS (LIKE A KNOXSS) Testing for Cross-Site Scripting (XSS) might seem easy at first sight, with several hacking tools automating this process. But regardless of how tests to find a XSS are performed, automated or manually, here we will see a step-by-step procedure to try to find most of the XSS casesout there.
BRUTE XSS - MASTER THE ART OF CROSS SITE SCRIPTING. Brute XSS - Master the art of Cross Site Scripting. XSS TEST PAGE BY BRUTE LOGIC XSS Test by @brutelogic Hello, guest! Find user profile providing oneor more below:
XSS CHEAT SHEET
XSS Cheat Sheet – 2020 Edition _____ Disclaimer We, author and publisher, are not responsible for the use of this material or thedamage
BLIND XSS CODE
A simple code to grab remote info from a victim which triggers a blind XSS and emailed them to a tester/attacker is here. It needs to be renamed to index.php and have the email data “myName@myDomain” and “report@myDomain” correctly replaced by tester/attacker own settings. It also needs a SMTP server installed and configured in thesystem.
BRUTE XSS - MASTER THE ART OF CROSS SITE SCRIPTING. The Art of XSS Payload Building. Testing for Cross-Site Scripting (XSS) might seem easy at first sight, with several hacking tools automating this process. But regardless of how tests to find a XSS are performed, automated or manually, here we will see a step-by-step procedure to try to find most of the XSS cases out there.XSS CHEAT SHEET
XSS Cheat Sheet. This 32-page booklet includes 100+ Cross-Site Scripting payloads and techniques with clear directions in several possible scenarios to help you with modern XSS. Sample here. Table of Contents: 1. Basics. 2. Advanced. 3. CSP BYPASS GUIDELINES CSP Bypass Guidelines. March 8, 2021. March 8, 2021. Brute The Art of XSS Payload Building. Content Security Policy (CSP) is the last line of defense against the exploitation of a XSS vulnerability. When correctly implemented, it seems to be extremely effective in doing so (nowadays). Here we will deal with the possible ways to abuse flaws inDOM-BASED XSS
The most common type of XSS (Cross-Site Scripting) is source-based. It means that injected JavaScript code comes from server side to execute in client side. But there’s another main type, the DOM-based one, where injected malicious input does not come from server via reflected or stored means: XSS is generated in client side by native Continue reading DOM-based XSS – The 3 SinksXSS 101 - BRUTE XSS
1. What is XSS? Cross-site scripting (XSS) is both the name of the most common vulnerability in web applications and the exploitation method performed against it. XSS attacks abuse the dynamic way websites interact with their clients, the browsers. It makes possible, for an attacker, to control the victim’s browser and his/her interaction with a Continue reading XSS 101 THE GENESIS OF AN XSS WORM The greatest danger of a cross-site scripting (XSS) vulnerability is the possibility of spreading from user to user of an application until the whole user system get infected. Such code capable of doing that is what we call an XSS worm. In order to better understand how this digital creature works, we will start a Continue reading The Genesis of an XSS Worm – Part I XSS VIA HTTP HEADERS In some cases, an information passed in one of the HTTP headers of the application is not correctly sanitized and it’s outputted somewhere in the requested page or in another end, giving rise to a XSS situation. But unfortunately, once an attacker can’t make a victim to edit his/her own HTTP headers in an actual Continue reading XSS viaHTTP Headers
XSS AND RCE
XSS and RCE. May 9, 2016. May 9, 2016. Brute The Art of XSS Payload Building. RCE (Remote Code Execution) is a critical vulnerability which usually is the final goal of an attack. With code execution, it’s possible to compromise servers, clients and entire networks. XSS, as many other vulnerabilities, is a step towards to it, even ifpeople
XSS PAYLOAD SCHEME
XSS Cheat Sheet. The best Cross-Site Scripting collection out there! Tested Proof-of-Concept vectors and payloads. Covers basics to advanced, filter bypass and other cases. XSS TEST PAGE BY BRUTE LOGIC XSS Test by @brutelogic Hello, guest! Find user profile providing oneor more below:
BRUTE XSS - MASTER THE ART OF CROSS SITE SCRIPTING. The Art of XSS Payload Building. Testing for Cross-Site Scripting (XSS) might seem easy at first sight, with several hacking tools automating this process. But regardless of how tests to find a XSS are performed, automated or manually, here we will see a step-by-step procedure to try to find most of the XSS cases out there.XSS CHEAT SHEET
XSS Cheat Sheet. This 32-page booklet includes 100+ Cross-Site Scripting payloads and techniques with clear directions in several possible scenarios to help you with modern XSS. Sample here. Table of Contents: 1. Basics. 2. Advanced. 3. CSP BYPASS GUIDELINES CSP Bypass Guidelines. March 8, 2021. March 8, 2021. Brute The Art of XSS Payload Building. Content Security Policy (CSP) is the last line of defense against the exploitation of a XSS vulnerability. When correctly implemented, it seems to be extremely effective in doing so (nowadays). Here we will deal with the possible ways to abuse flaws inDOM-BASED XSS
The most common type of XSS (Cross-Site Scripting) is source-based. It means that injected JavaScript code comes from server side to execute in client side. But there’s another main type, the DOM-based one, where injected malicious input does not come from server via reflected or stored means: XSS is generated in client side by native Continue reading DOM-based XSS – The 3 SinksXSS 101 - BRUTE XSS
1. What is XSS? Cross-site scripting (XSS) is both the name of the most common vulnerability in web applications and the exploitation method performed against it. XSS attacks abuse the dynamic way websites interact with their clients, the browsers. It makes possible, for an attacker, to control the victim’s browser and his/her interaction with a Continue reading XSS 101 THE GENESIS OF AN XSS WORM The greatest danger of a cross-site scripting (XSS) vulnerability is the possibility of spreading from user to user of an application until the whole user system get infected. Such code capable of doing that is what we call an XSS worm. In order to better understand how this digital creature works, we will start a Continue reading The Genesis of an XSS Worm – Part I XSS VIA HTTP HEADERS In some cases, an information passed in one of the HTTP headers of the application is not correctly sanitized and it’s outputted somewhere in the requested page or in another end, giving rise to a XSS situation. But unfortunately, once an attacker can’t make a victim to edit his/her own HTTP headers in an actual Continue reading XSS viaHTTP Headers
XSS AND RCE
XSS and RCE. May 9, 2016. May 9, 2016. Brute The Art of XSS Payload Building. RCE (Remote Code Execution) is a critical vulnerability which usually is the final goal of an attack. With code execution, it’s possible to compromise servers, clients and entire networks. XSS, as many other vulnerabilities, is a step towards to it, even ifpeople
XSS PAYLOAD SCHEME
XSS Cheat Sheet. The best Cross-Site Scripting collection out there! Tested Proof-of-Concept vectors and payloads. Covers basics to advanced, filter bypass and other cases. XSS TEST PAGE BY BRUTE LOGIC XSS Test by @brutelogic Hello, guest! Find user profile providing oneor more below:
XSS CHEAT SHEET
XSS Cheat Sheet. This 32-page booklet includes 100+ Cross-Site Scripting payloads and techniques with clear directions in several possible scenarios to help you with modern XSS. Sample here. Table of Contents: 1. Basics. 2. Advanced. 3.XSS 101 - BRUTE XSS
1. What is XSS? Cross-site scripting (XSS) is both the name of the most common vulnerability in web applications and the exploitation method performed against it. XSS attacks abuse the dynamic way websites interact with their clients, the browsers. It makes possible, for an attacker, to control the victim’s browser and his/her interaction with a Continue reading XSS 101LEVERAGING SELF-XSS
Leveraging Self-XSS. April 2, 2016. April 14, 2020. Brute The Art of XSS Payload Building. Self-XSS is a curious case of cross-site scripting: an attacker is able to execute code in the browser, but only he/she can do it. No link to share, no common place to be visited by someone else in case of a stored flaw (like in restrictedprofiles).
XSS PAYLOAD SCHEME
XSS Cheat Sheet. The best Cross-Site Scripting collection out there! Tested Proof-of-Concept vectors and payloads. Covers basics to advanced, filter bypass and other cases. MULTI REFLECTION XSS When finding XSS in websites usually we see more than one reflection of our input in source code which can be very useful to bypass several types of filters. Let’s start with a very simple way to know how many reflections we may have with the same payload: Example: French Wikipedia Website => Continue reading Multi Reflection XSS TESTING FOR XSS (LIKE A KNOXSS) Testing for Cross-Site Scripting (XSS) might seem easy at first sight, with several hacking tools automating this process. But regardless of how tests to find a XSS are performed, automated or manually, here we will see a step-by-step procedure to try to find most of the XSS casesout there.
BRUTE XSS - MASTER THE ART OF CROSS SITE SCRIPTING. Brute XSS - Master the art of Cross Site Scripting. XSS TEST PAGE BY BRUTE LOGIC XSS Test by @brutelogic Hello, guest! Find user profile providing oneor more below:
XSS CHEAT SHEET
XSS Cheat Sheet – 2020 Edition _____ Disclaimer We, author and publisher, are not responsible for the use of this material or thedamage
BLIND XSS CODE
A simple code to grab remote info from a victim which triggers a blind XSS and emailed them to a tester/attacker is here. It needs to be renamed to index.php and have the email data “myName@myDomain” and “report@myDomain” correctly replaced by tester/attacker own settings. It also needs a SMTP server installed and configured in thesystem.
BRUTE XSS - MASTER THE ART OF CROSS SITE SCRIPTING. The Art of XSS Payload Building. Testing for Cross-Site Scripting (XSS) might seem easy at first sight, with several hacking tools automating this process. But regardless of how tests to find a XSS are performed, automated or manually, here we will see a step-by-step procedure to try to find most of the XSS cases out there. CSP BYPASS GUIDELINES CSP Bypass Guidelines. March 8, 2021. March 8, 2021. Brute The Art of XSS Payload Building. Content Security Policy (CSP) is the last line of defense against the exploitation of a XSS vulnerability. When correctly implemented, it seems to be extremely effective in doing so (nowadays). Here we will deal with the possible ways to abuse flaws inDOM-BASED XSS
The most common type of XSS (Cross-Site Scripting) is source-based. It means that injected JavaScript code comes from server side to execute in client side. But there’s another main type, the DOM-based one, where injected malicious input does not come from server via reflected or stored means: XSS is generated in client side by native Continue reading DOM-based XSS – The 3 SinksXSS CHEAT SHEET
XSS Cheat Sheet. This 32-page booklet includes 100+ Cross-Site Scripting payloads and techniques with clear directions in several possible scenarios to help you with modern XSS. Sample here. Table of Contents: 1. Basics. 2. Advanced. 3.XSS 101 - BRUTE XSS
1. What is XSS? Cross-site scripting (XSS) is both the name of the most common vulnerability in web applications and the exploitation method performed against it. XSS attacks abuse the dynamic way websites interact with their clients, the browsers. It makes possible, for an attacker, to control the victim’s browser and his/her interaction with a Continue reading XSS 101 THE GENESIS OF AN XSS WORM The greatest danger of a cross-site scripting (XSS) vulnerability is the possibility of spreading from user to user of an application until the whole user system get infected. Such code capable of doing that is what we call an XSS worm. In order to better understand how this digital creature works, we will start a Continue reading The Genesis of an XSS Worm – Part IXSS AND RCE
XSS and RCE. May 9, 2016. May 9, 2016. Brute The Art of XSS Payload Building. RCE (Remote Code Execution) is a critical vulnerability which usually is the final goal of an attack. With code execution, it’s possible to compromise servers, clients and entire networks. XSS, as many other vulnerabilities, is a step towards to it, even ifpeople
XSS VIA HTTP HEADERS In some cases, an information passed in one of the HTTP headers of the application is not correctly sanitized and it’s outputted somewhere in the requested page or in another end, giving rise to a XSS situation. But unfortunately, once an attacker can’t make a victim to edit his/her own HTTP headers in an actual Continue reading XSS viaHTTP Headers
BRUTE XSS - MASTER THE ART OF CROSS SITE SCRIPTING. Brute XSS - Master the art of Cross Site Scripting.XSS CHEAT SHEET
XSS Cheat Sheet – 2020 Edition _____ Disclaimer We, author and publisher, are not responsible for the use of this material or thedamage
BRUTE XSS - MASTER THE ART OF CROSS SITE SCRIPTING. The Art of XSS Payload Building. Testing for Cross-Site Scripting (XSS) might seem easy at first sight, with several hacking tools automating this process. But regardless of how tests to find a XSS are performed, automated or manually, here we will see a step-by-step procedure to try to find most of the XSS cases out there. CSP BYPASS GUIDELINES CSP Bypass Guidelines. March 8, 2021. March 8, 2021. Brute The Art of XSS Payload Building. Content Security Policy (CSP) is the last line of defense against the exploitation of a XSS vulnerability. When correctly implemented, it seems to be extremely effective in doing so (nowadays). Here we will deal with the possible ways to abuse flaws inDOM-BASED XSS
The most common type of XSS (Cross-Site Scripting) is source-based. It means that injected JavaScript code comes from server side to execute in client side. But there’s another main type, the DOM-based one, where injected malicious input does not come from server via reflected or stored means: XSS is generated in client side by native Continue reading DOM-based XSS – The 3 SinksXSS CHEAT SHEET
XSS Cheat Sheet. This 32-page booklet includes 100+ Cross-Site Scripting payloads and techniques with clear directions in several possible scenarios to help you with modern XSS. Sample here. Table of Contents: 1. Basics. 2. Advanced. 3.XSS 101 - BRUTE XSS
1. What is XSS? Cross-site scripting (XSS) is both the name of the most common vulnerability in web applications and the exploitation method performed against it. XSS attacks abuse the dynamic way websites interact with their clients, the browsers. It makes possible, for an attacker, to control the victim’s browser and his/her interaction with a Continue reading XSS 101 THE GENESIS OF AN XSS WORM The greatest danger of a cross-site scripting (XSS) vulnerability is the possibility of spreading from user to user of an application until the whole user system get infected. Such code capable of doing that is what we call an XSS worm. In order to better understand how this digital creature works, we will start a Continue reading The Genesis of an XSS Worm – Part IXSS AND RCE
XSS and RCE. May 9, 2016. May 9, 2016. Brute The Art of XSS Payload Building. RCE (Remote Code Execution) is a critical vulnerability which usually is the final goal of an attack. With code execution, it’s possible to compromise servers, clients and entire networks. XSS, as many other vulnerabilities, is a step towards to it, even ifpeople
XSS VIA HTTP HEADERS In some cases, an information passed in one of the HTTP headers of the application is not correctly sanitized and it’s outputted somewhere in the requested page or in another end, giving rise to a XSS situation. But unfortunately, once an attacker can’t make a victim to edit his/her own HTTP headers in an actual Continue reading XSS viaHTTP Headers
BRUTE XSS - MASTER THE ART OF CROSS SITE SCRIPTING. Brute XSS - Master the art of Cross Site Scripting.XSS CHEAT SHEET
XSS Cheat Sheet – 2020 Edition _____ Disclaimer We, author and publisher, are not responsible for the use of this material or thedamage
XSS CHEAT SHEET
XSS Cheat Sheet. This 32-page booklet includes 100+ Cross-Site Scripting payloads and techniques with clear directions in several possible scenarios to help you with modern XSS. Sample here. Table of Contents: 1. Basics. 2. Advanced. 3.LEVERAGING SELF-XSS
Leveraging Self-XSS. April 2, 2016. April 14, 2020. Brute The Art of XSS Payload Building. Self-XSS is a curious case of cross-site scripting: an attacker is able to execute code in the browser, but only he/she can do it. No link to share, no common place to be visited by someone else in case of a stored flaw (like in restrictedprofiles).
BRUTE XSS - MASTER THE ART OF CROSS SITE SCRIPTING. Brute XSS - Master the art of Cross Site Scripting.XSS PAYLOAD SCHEME
XSS Cheat Sheet. The best Cross-Site Scripting collection out there! Tested Proof-of-Concept vectors and payloads. Covers basics to advanced, filter bypass and other cases. LOOKING FOR XSS IN PHP SOURCE CODE If we have the source code of a server side script, which is the case of open source software, we can find XSS vulnerabilities in an automated and much faster way. This white box approach is called static analysis and there’s a lot of tools available in the web for this task. But following our Continue reading Looking for XSS in PHPSource Code
XSS CHEAT SHEET
XSS Cheat Sheet – 2020 Edition _____ Disclaimer We, author and publisher, are not responsible for the use of this material or thedamage
BUILDING ADVANCED XSS VECTORS About - Presentation Not just another talk on XSS Use of alert(1) for didactic purposes Mainly about event based XSS Some stuff may be hardto follow
FILTER BYPASS IN MULTI CONTEXT The following multi context XSS cases come with a different yet more common scenarios: different entry points (“p” & “q” parameters) and Javascript context with JSON correctly encoded, giving no room for a bypass (with single reflection). We start with a simple and straightforward case, again filtering both entry points properly. XSS TEST PAGE BY BRUTE LOGIC XSS Test by @brutelogic Hello, guest! Find user profile providing oneor more below:
XSS TEST PAGE BY BRUTE LOGIC XSS Test by @brutelogic Hello, ! Find user profile providing one ormore below:
BRUTE XSS - MASTER THE ART OF CROSS SITE SCRIPTING. Master the art of Cross Site Scripting. Content Security Policy (CSP) is the last line of defense against the exploitation of a XSS vulnerability. When correctly implemented, it seems to be extremely effective in doing so (nowadays).XSS 101 - BRUTE XSS
1. What is XSS? Cross-site scripting (XSS) is both the name of the most common vulnerability in web applications and the exploitation method performed against it. XSS attacks abuse the dynamic way websites interact with their clients, the browsers. It makes possible, for an attacker, to control the victim’s browser and his/her interaction with a Continue reading XSS 101 XSS VIA HTTP HEADERS In some cases, an information passed in one of the HTTP headers of the application is not correctly sanitized and it’s outputted somewhere in the requested page or in another end, giving rise to a XSS situation. But unfortunately, once an attacker can’t make a victim to edit his/her own HTTP headers in an actual Continue reading XSS viaHTTP Headers
CSP BYPASS GUIDELINES Content Security Policy (CSP) is the last line of defense against the exploitation of a XSS vulnerability. When correctly implemented, it seems to be extremely effective in doing so (nowadays). Here we will deal with the possible ways to abuse flaws in its implementation. For a comprehensive reference on CSP check here. Some basic samples Continue reading CSP Bypass GuidelinesDOM-BASED XSS
The most common type of XSS (Cross-Site Scripting) is source-based. It means that injected JavaScript code comes from server side to execute in client side. But there’s another main type, the DOM-based one, where injected malicious input does not come from server via reflected or stored means: XSS is generated in client side by native Continue reading DOM-based XSS – The 3 SinksXSS AND RCE
RCE (Remote Code Execution) is a critical vulnerability which usually is the final goal of an attack. With code execution, it’s possible to compromise servers, clients and entire networks. XSS, as many other vulnerabilities, is a step towards to it, even if people usually don’t think about XSS in this way. But far from being Continuereading XSS and RCE
THE GENESIS OF AN XSS WORM The greatest danger of a cross-site scripting (XSS) vulnerability is the possibility of spreading from user to user of an application until the whole user system get infected. Such code capable of doing that is what we call an XSS worm. In order to better understand how this digital creature works, we will start a Continue reading The Genesis of an XSS Worm – Part I LOCATION BASED PAYLOADS In researching a way to evade a filter which detects and blocks the XSS attempt in the presence of parentheses in a payload, I came to interesting solutions of this problem that will be shared in this post and its subsequent parts. It’s worth to note that any encoding of the prohibited characters would not Continue reading Location BasedPayloads – Part I
CHROME XSS AUDITOR
More than an year ago, in my private twitter account Brutal Secrets, I shared an interesting way to bypass Google’s Chrome anti-XSS filter called XSS Auditor. We will see now in details, from a blackbox perspective, a logical sequence of assumptions and conclusions that leads to our XSS vector responsible for the bypass. We start Continue reading Chrome XSS Auditor – SVG Bypass CALLING REMOTE SCRIPT WITH EVENT HANDLERS After a tester or attacker is able to pop an alert box, the next step is to call an external script to do whatever he/she wants to do withthe victim.
BRUTE XSS - MASTER THE ART OF CROSS SITE SCRIPTING. Master the art of Cross Site Scripting. Content Security Policy (CSP) is the last line of defense against the exploitation of a XSS vulnerability. When correctly implemented, it seems to be extremely effective in doing so (nowadays).XSS 101 - BRUTE XSS
1. What is XSS? Cross-site scripting (XSS) is both the name of the most common vulnerability in web applications and the exploitation method performed against it. XSS attacks abuse the dynamic way websites interact with their clients, the browsers. It makes possible, for an attacker, to control the victim’s browser and his/her interaction with a Continue reading XSS 101 XSS VIA HTTP HEADERS In some cases, an information passed in one of the HTTP headers of the application is not correctly sanitized and it’s outputted somewhere in the requested page or in another end, giving rise to a XSS situation. But unfortunately, once an attacker can’t make a victim to edit his/her own HTTP headers in an actual Continue reading XSS viaHTTP Headers
CSP BYPASS GUIDELINES Content Security Policy (CSP) is the last line of defense against the exploitation of a XSS vulnerability. When correctly implemented, it seems to be extremely effective in doing so (nowadays). Here we will deal with the possible ways to abuse flaws in its implementation. For a comprehensive reference on CSP check here. Some basic samples Continue reading CSP Bypass GuidelinesDOM-BASED XSS
The most common type of XSS (Cross-Site Scripting) is source-based. It means that injected JavaScript code comes from server side to execute in client side. But there’s another main type, the DOM-based one, where injected malicious input does not come from server via reflected or stored means: XSS is generated in client side by native Continue reading DOM-based XSS – The 3 SinksXSS AND RCE
RCE (Remote Code Execution) is a critical vulnerability which usually is the final goal of an attack. With code execution, it’s possible to compromise servers, clients and entire networks. XSS, as many other vulnerabilities, is a step towards to it, even if people usually don’t think about XSS in this way. But far from being Continuereading XSS and RCE
THE GENESIS OF AN XSS WORM The greatest danger of a cross-site scripting (XSS) vulnerability is the possibility of spreading from user to user of an application until the whole user system get infected. Such code capable of doing that is what we call an XSS worm. In order to better understand how this digital creature works, we will start a Continue reading The Genesis of an XSS Worm – Part I LOCATION BASED PAYLOADS In researching a way to evade a filter which detects and blocks the XSS attempt in the presence of parentheses in a payload, I came to interesting solutions of this problem that will be shared in this post and its subsequent parts. It’s worth to note that any encoding of the prohibited characters would not Continue reading Location BasedPayloads – Part I
CHROME XSS AUDITOR
More than an year ago, in my private twitter account Brutal Secrets, I shared an interesting way to bypass Google’s Chrome anti-XSS filter called XSS Auditor. We will see now in details, from a blackbox perspective, a logical sequence of assumptions and conclusions that leads to our XSS vector responsible for the bypass. We start Continue reading Chrome XSS Auditor – SVG Bypass CALLING REMOTE SCRIPT WITH EVENT HANDLERS After a tester or attacker is able to pop an alert box, the next step is to call an external script to do whatever he/she wants to do withthe victim.
LEVERAGING SELF-XSS
Self-XSS is a curious case of cross-site scripting: an attacker is able to execute code in the browser, but only he/she can do it. No link to share, no common place to be visited by someone else in case of a stored flaw (like in restricted profiles). It’s confined to the place where it runs, Continue reading Leveraging Self-XSSXSS PAYLOAD SCHEME
XSS Cheat Sheet. The best Cross-Site Scripting collection out there! Tested Proof-of-Concept vectors and payloads. Covers basics to advanced, filter bypass and other cases. BRUTE XSS - MASTER THE ART OF CROSS SITE SCRIPTING. Brute XSS - Master the art of Cross Site Scripting. CROSS-ORIGIN SCRIPTING The origin of the XSS term comes from the pre-SOP (Same Origin Policy) age, when the attacks were really against a domain from a domain, hence the use of “cross-site” to describe it. Nowadays it’s more likely to consider XSS as a client-side markup/script injection because these attacks don’t really need to rely on another Continue reading Cross-Origin Scripting MULTI REFLECTION XSS When finding XSS in websites usually we see more than one reflection of our input in source code which can be very useful to bypass several types of filters. Let’s start with a very simple way to know how many reflections we may have with the same payload: Example: French Wikipedia Website => Continue reading Multi Reflection XSS TESTING FOR XSS (LIKE A KNOXSS) Testing for Cross-Site Scripting (XSS) might seem easy at first sight, with several hacking tools automating this process. But regardless of how tests to find a XSS are performed, automated or manually, here we will see a step-by-step procedure to try to find most of the XSS casesout there.
XSS WITHOUT EVENT HANDLERS Thanks for your comments, but I have to disagree. First, although it’s far better to have a payload running in the target domain, there’s no need of it to hook the browser or fake a web form which I consider a valid attack.BLIND XSS CODE
There are situations where an injection traverses profile areas, services and even network boundaries usually by means of a database storage of user controlled input (stored XSS). But when a tester or attacker is not able to see his/her injection working using regular ways and/or the inner workings of the affected software is not known, Continue reading Blind XSS Code XSS TEST PAGE BY BRUTE LOGIC XSS Test by @brutelogic Hello, guest! Find user profile providing oneor more below:
KNOXSS ADD-ON TEST PAGE KNOXSS Add-on Test Page => Click on your add-on icon to turn it on for this domain and then navigate clicking in one of the links below (except the ones marked with * which are in another domain).Skip to content
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FILTER BYPASS IN MULTI CONTEXT March 10, 2020March 10, 2020Brute
The Art of XSS PayloadBuilding
Some Cross-Site Scripting (XSS) vectors arise from strict but allowed possibilities, forming tricky combinations. It’s all about contexts and sometimes the interaction between different contexts with different filters lead to some interesting bypasses. Although in the same document (or page), usually the source code of a HTTP response is formed by 3 different contexts: HTML, Javascript and CSS. They have their own syntax and different filters are applied to the output of user input to avoid XSS situations. Continue reading → TESTING FOR XSS (LIKE A KNOXSS) November 28, 2019December 2, 2019Brute
The Art of XSS PayloadBuilding
Testing
for Cross-Site Scripting (XSS) might seem easy at first sight, with several hacking tools automating this process. But regardless of how tests to find a XSS are performed, automated or manually, here we will see a step-by-step procedure to try to find most of the XSS cases out there. For that we will use the same approach employed by KNOXSS , our online XSS PoCtool. Although
without details of its own implementation and intermediary steps needed to make its decisions (which will be done by ourselves if we follow the tests manually), this will cover pretty much what is done by this unique tool. Continue reading → XSS VIA HTTP HEADERS August 21, 2019August 21, 2019Brute
The Art of XSS PayloadBuilding
In
some cases, an information passed in one of the HTTP headers of the application is not correctly sanitized and it’s outputted somewhere in the requested page or in another end, giving rise to a XSSsituation.
But unfortunately, once an attacker can’t make a victim to edit his/her own HTTP headers in an actual XSS attack, those scenarios can only be exploited if the attacker payload remains stored somehow. Continue reading → XSS IN LIMITED INPUT FORMATS March 11, 2019March 11, 2019Brute
The Art of XSS PayloadBuilding
Testing
for XSS vulnerabilities requires knowing the data format of input. Usually the format is simply “string” without any restrictions but sometimes the manipulation of XSS entry point is limited. In most of times it might lead to the assumption of a security filter, one designed/employed specifically to avoid the attack which is nottrue.
Continue reading → ADVANCED JAVASCRIPT INJECTIONS December 11, 2018December 11, 2018Brute
The Art of XSS PayloadBuilding
Simple
JavaScript injections like ‘-alert(1)-’ or even \’-alert(1)// (see cases #6 and #7 here)
are usually enough to pop an alert box in a vulnerable page when an input reflection happens inside a script block and no HTML injection is possible (case #5 of same post above). But there are cases where the injection point lands in the middle of a more complex JS code: inside functions and conditionals (if or if+else), nested inside each other. Continue reading → QUOTELESS JAVASCRIPT INJECTIONS September 17, 2018November 3, 2018 Brute The Art of XSSPayload Building
In
multi reflection scenarios, like we already have seen here, it’s
possible to use payloads in such a way that avoid filters and WAFs (Web Application Firewalls) due to the change in the order of itselements.
But in source-based JS injections (those which happen in script blocks) there’s another interesting consequence of having more than one reflection point. Continue reading → DOM-BASED XSS – THE 3 SINKS April 16, 2018November 3, 2018Brute
The Art of XSS PayloadBuilding
The
most common type of XSS (Cross-Site Scripting) is source-based. It means that injected JavaScript code comes from server side to executein client side.
But there’s another main type, the DOM-based one, where injected malicious input does not come from server via reflected or stored means: XSS is generated in client side by native JavaScript code. Continue reading → CHROME XSS AUDITOR – SVG BYPASS August 14, 2017November 3, 2018Brute
The Art of XSS PayloadBuilding
More
than an year ago, in my private twitter account Brutal Secrets , I shared an interesting way to bypass Google’s Chrome anti-XSS filter called XSS Auditor. We will see now in details, from a blackbox perspective, a logical sequence of assumptions and conclusions that leads to our XSS vector responsible for the bypass. Continue reading → THE 7 MAIN XSS CASES EVERYONE SHOULD KNOW July 10, 2017November 3, 2018 Brute The Art of XSSPayload Building
When
reading material on XSS subject we usually see the classical as an demonstration of such vulnerability (PoC – Proof of Concept). While very true, it doesn’t go much beyond this, making the novice in this field to look for more in order to deal with real world scenarios. Continue reading → COMPROMISING CMSES WITH XSS June 5, 2017November 3, 2018Brute
The Art of XSS PayloadBuilding
CMSes
(Content Management Systems) are a perfect target for XSS attacks: with their module installation features and the possibility to know all the requests done by a legit administrator of the system previously, it’s pretty easy to mount a CSRF (Cross-Site Request Forgery) attack against him/her. Continue reading →POST NAVIGATION
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