CVE-2004-1229 in Instant Messenger
Summary
by MITRE
Cross-site scripting vulnerability in the parser for Gadu-Gadu allows remote attackers to inject arbitrary web script or HTML via (1) http:// or (2) news:// URLs, a different vulnerability than CVE-2004-1410.
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Analysis
by VulDB Data Team • 07/21/2017
The vulnerability identified as CVE-2004-1229 represents a cross-site scripting flaw within the Gadu-Gadu messaging protocol parser, specifically targeting the handling of uniform resource identifiers. This security weakness resides in the client-side processing logic that interprets various URL schemes, creating an avenue for malicious actors to execute unauthorized code within the context of a victim's browser session. The vulnerability manifests when the Gadu-Gadu client processes incoming messages containing specially crafted URLs, particularly those beginning with http:// or news:// protocols, which are then rendered without proper sanitization or encoding.
The technical exploitation of this vulnerability occurs through the manipulation of URL schemes within Gadu-Gadu messages, where the parser fails to adequately validate or escape user-supplied input before rendering it in the client interface. When a victim receives a message containing malicious URLs, the parser processes these inputs without sufficient security controls, allowing attackers to inject arbitrary HTML code or JavaScript payloads. This flaw falls under the category of CWE-79 - Improper Neutralization of Input During Web Page Generation, which specifically addresses the failure to properly sanitize user input that could lead to XSS attacks. The vulnerability demonstrates a classic case of insufficient input validation where the application trust the integrity of received data without proper sanitization mechanisms.
The operational impact of CVE-2004-1229 extends beyond simple script injection, as it enables attackers to perform various malicious activities including session hijacking, credential theft, and redirection to phishing sites. When exploited, the vulnerability allows remote attackers to execute code within the context of the victim's browser, potentially compromising user sessions and accessing sensitive information. The attack vector specifically leverages the trust placed in legitimate Gadu-Gadu communication channels, making it particularly dangerous as users are unlikely to suspect malicious content within standard messaging protocols. This vulnerability operates in the realm of web-based attacks and aligns with ATT&CK technique T1566.001 - Phishing: Spearphishing Attachment, where malicious payloads are delivered through seemingly legitimate communication channels.
Mitigation strategies for this vulnerability require immediate implementation of proper input sanitization and output encoding mechanisms within the Gadu-Gadu client parser. Organizations should ensure that all URL schemes are validated against a whitelist of approved protocols and that any user-supplied content is properly encoded before rendering in the client interface. The solution involves implementing robust input validation that specifically addresses URL parsing and ensuring that the application treats all external content as untrusted. Additionally, security updates should include proper HTML escaping routines that prevent malicious scripts from executing when URLs are displayed within the messaging interface. These measures align with security best practices outlined in OWASP Top Ten and provide defense in depth against similar cross-site scripting vulnerabilities in web applications and messaging protocols. The vulnerability serves as a reminder of the critical importance of input validation in all user-facing applications and the necessity of treating all external data sources as potentially malicious.