Cross-Site Scripting(using elgg Application) -- SEEDUbuntu
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7 ماه پیش
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Cross-Site Scripting (XSS) remains a
Cross-Site Scripting (XSS) remains a pervasive vulnerability in web applications, enabling attackers to inject malicious code, such as JavaScript, into a victim's web browser. This report explores the practical aspects of XSS vulnerabilities through a hands-on laboratory exercise using the Elgg web application in a controlled Ubuntu 16.04 virtual machine environment.
The lab guides participants through a series of tasks, starting with the intentional exposure of Elgg to XSS attacks by disabling countermeasures. Participants are tasked with exploiting this vulnerability to launch an XSS attack similar to the infamous Samy worm on MySpace in 2005. The objective is to spread an XSS worm among users, causing infected profiles to automatically add the attacker to their friend lists.
The lab covers essential topics including Cross-Site Scripting attacks, XSS worms, self-propagation and session cookies. Tasks range from posting a simple malicious message to executing more advanced attacks such as displaying and stealing user cookies, and ultimately, making the XSS worm self-propagating.
The report introduces a more sophisticated attack inspired by the Samy Worm incident on MySpace. Participants are instructed to create a JavaScript program that forges HTTP requests from the victim's browser to add the attacker (Samy) as a friend without direct intervention. The report provides guidance on analyzing legitimate HTTP requests and adapting the JavaScript code accordingly.
Question 1: Explain the purpose of Lines ➀ and ➁, why are they are needed?
Lines (1) and (2) seem to be constructing parameters to be appended to the URL for the HTTP request. These parameters include a timestamp (elgg_ts) and a security token (elgg_token). The purpose of these lines is likely to include a time-based token and a security token in the Ajax request. This is a common practice in web applications to prevent certain types of attacks, such as cross-site request forgery (CSRF). The timestamp and security token are usually used to validate the authenticity of the request and to ensure that it is not a replay attack.
Question 2: If the Elgg application only provide the Editor mode for the "About Me" field, i.e. you cannot switch to the Text mode, can you still launch a successful attack?
If the Elgg application only provides the Editor mode for the "About Me" field and you cannot switch to Text mode, it may limit the attack vectors. However, the success of an attack depends on the specific vulnerabilities present in the application and how it processes user input.
The lab guides participants through a series of tasks, starting with the intentional exposure of Elgg to XSS attacks by disabling countermeasures. Participants are tasked with exploiting this vulnerability to launch an XSS attack similar to the infamous Samy worm on MySpace in 2005. The objective is to spread an XSS worm among users, causing infected profiles to automatically add the attacker to their friend lists.
The lab covers essential topics including Cross-Site Scripting attacks, XSS worms, self-propagation and session cookies. Tasks range from posting a simple malicious message to executing more advanced attacks such as displaying and stealing user cookies, and ultimately, making the XSS worm self-propagating.
The report introduces a more sophisticated attack inspired by the Samy Worm incident on MySpace. Participants are instructed to create a JavaScript program that forges HTTP requests from the victim's browser to add the attacker (Samy) as a friend without direct intervention. The report provides guidance on analyzing legitimate HTTP requests and adapting the JavaScript code accordingly.
Question 1: Explain the purpose of Lines ➀ and ➁, why are they are needed?
Lines (1) and (2) seem to be constructing parameters to be appended to the URL for the HTTP request. These parameters include a timestamp (elgg_ts) and a security token (elgg_token). The purpose of these lines is likely to include a time-based token and a security token in the Ajax request. This is a common practice in web applications to prevent certain types of attacks, such as cross-site request forgery (CSRF). The timestamp and security token are usually used to validate the authenticity of the request and to ensure that it is not a replay attack.
Question 2: If the Elgg application only provide the Editor mode for the "About Me" field, i.e. you cannot switch to the Text mode, can you still launch a successful attack?
If the Elgg application only provides the Editor mode for the "About Me" field and you cannot switch to Text mode, it may limit the attack vectors. However, the success of an attack depends on the specific vulnerabilities present in the application and how it processes user input.
7 ماه پیش
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