CVE-2007-3910 in Bandersnatch
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Bandersnatch 0.4 allows remote attackers to inject arbitrary JavaScript via a Jabber resource name and possibly other data items, which are stored in conversation logs.
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Analysis
by VulDB Data Team • 09/05/2018
The vulnerability described in CVE-2007-3910 represents a classic cross-site scripting flaw within the Bandersnatch instant messaging client version 0.4. This particular implementation exposes users to significant security risks through improper input validation and sanitization of Jabber resource names and other data elements. The vulnerability exists because the application fails to adequately filter or escape user-supplied data before storing it in conversation logs, creating a persistent XSS vector that can be exploited by remote attackers.
The technical flaw manifests when malicious actors craft specially formatted Jabber resource names containing JavaScript code that gets executed when legitimate users view the conversation logs. This type of vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws in web applications and client-side systems. The attacker can leverage this weakness to inject malicious scripts that execute in the context of the victim's browser, potentially leading to session hijacking, data theft, or further compromise of the victim's system. The persistence of this vulnerability stems from the fact that the malicious code is stored in conversation logs, making it active each time those logs are accessed.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable sophisticated attack chains within the messaging environment. When users view conversation logs containing the malicious JavaScript, the code executes automatically in their browser context, potentially allowing attackers to steal session cookies, redirect users to malicious sites, or perform actions on behalf of the victim. This vulnerability particularly affects collaborative environments where conversation logs are shared or viewed by multiple users, amplifying the potential attack surface. The attack can be classified under ATT&CK technique T1566 which covers spearphishing with a link, as the malicious JavaScript often serves as a delivery mechanism for further exploitation.
Mitigation strategies for this vulnerability require immediate implementation of proper input sanitization and output encoding mechanisms within the Bandersnatch application. All user-supplied data, particularly Jabber resource names and other conversation elements, must be validated against a strict whitelist of acceptable characters and patterns before being stored in logs. The system should employ context-appropriate escaping mechanisms when displaying user data, ensuring that any potentially malicious content is rendered harmless. Additionally, implementing Content Security Policy headers and adopting a principle of least privilege for log access can significantly reduce the impact of successful exploitation attempts. Regular security audits and code reviews should focus on input validation routines to prevent similar vulnerabilities from emerging in future versions of the application.