CVE-2008-6891 in ASP Forum Script
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in ASP Forum Script allow remote attackers to inject arbitrary web script or HTML via the (1) forum_id parameter to (a) new_message.asp and (b) messages.asp, and the (2) query string to default.asp.
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Analysis
by VulDB Data Team • 07/13/2024
The vulnerability identified as CVE-2008-6891 represents a critical security flaw in ASP Forum Script that exposes web applications to cross-site scripting attacks. This issue affects multiple pages within the forum application including new_message.asp, messages.asp, and default.asp, making it a widespread concern for organizations utilizing this particular forum software. The vulnerability stems from inadequate input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before incorporating it into dynamic web content. According to CWE classification, this vulnerability maps to CWE-79 which specifically addresses cross-site scripting flaws where untrusted data is improperly incorporated into web pages without proper sanitization or encoding measures.
The technical exploitation of this vulnerability occurs through manipulation of specific parameters within the web application's URL structure. Attackers can inject malicious scripts by crafting specially formatted URLs containing the forum_id parameter in new_message.asp and messages.asp, or by manipulating the query string in default.asp. These injection points allow threat actors to execute arbitrary JavaScript code within the context of other users' browsers who visit affected pages. The flaw exists because the application does not adequately validate or encode user input before rendering it in web responses, creating an environment where malicious payloads can be executed in the victim's browser context. The attack vector operates through standard HTTP GET requests, making it easily exploitable through social engineering techniques or by embedding malicious links in other web pages.
The operational impact of this vulnerability extends beyond simple data theft or defacement, as it enables attackers to perform session hijacking, steal sensitive information, and potentially escalate privileges within the affected application. Users who visit maliciously crafted links may unknowingly execute scripts that can capture their session cookies, redirect them to phishing sites, or perform actions on their behalf within the forum application. This vulnerability particularly affects the integrity and confidentiality of user communications, as any data exchanged through the forum could be compromised. The vulnerability also represents a significant risk to the application's availability, as attackers could potentially inject scripts that cause denial of service conditions or redirect users to malicious sites, creating a broader security incident that could affect the entire organization's online presence.
Mitigation strategies for CVE-2008-6891 should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application. Organizations should immediately apply the vendor-provided patches or upgrade to a newer version of the ASP Forum Script that addresses these vulnerabilities. Additionally, implementing proper parameter validation on all input parameters, particularly those used in URL query strings and form submissions, will prevent malicious data from being processed by the application. The implementation of Content Security Policy headers can provide an additional layer of protection against XSS attacks by restricting the sources from which scripts can be loaded. According to ATT&CK framework, this vulnerability falls under the T1059.007 technique for command and scripting interpreter, as it allows for the execution of malicious scripts within the victim's browser environment. Regular security testing including dynamic application security testing and manual penetration testing should be conducted to identify similar vulnerabilities in other web applications within the organization's infrastructure, ensuring comprehensive protection against cross-site scripting threats.