CVE-2001-1305 in ICQ
Summary
by MITRE
ICQ 2001a Alpha and earlier allows remote attackers to automatically add arbitrary UINs to an ICQ user s contact list via a URL to a web page with a Content-Type of application/x-icq, which is processed by Internet Explorer.
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Analysis
by VulDB Data Team • 05/31/2019
The vulnerability described in CVE-2001-1305 represents a significant security flaw in the ICQ instant messaging client version 2001a Alpha and earlier. This issue exploits a critical weakness in how the application handles specific content types when processing web-based requests through Internet Explorer. The vulnerability enables remote attackers to manipulate the target user's contact list by automatically adding arbitrary User Identification Numbers to their ICQ contact list without their knowledge or consent.
The technical mechanism behind this vulnerability involves the manipulation of web content through a specially crafted URL that delivers content with a Content-Type header set to application/x-icq. When Internet Explorer processes this content type, it triggers an automated behavior within the ICQ client that interprets the incoming data as legitimate contact list entries. This represents a classic case of improper input validation and unsafe content handling where the application fails to properly sanitize or validate external data sources before processing them. The vulnerability operates at the intersection of web browser security and instant messaging client security, exploiting the trust relationship between Internet Explorer and the ICQ application.
The operational impact of this vulnerability is substantial as it allows for unauthorized contact list manipulation, which can serve as a precursor to more sophisticated attacks. Attackers can use this technique to flood users with unwanted contacts, potentially leading to social engineering campaigns, phishing attempts, or other malicious activities. The automatic nature of the addition means users remain unaware of the compromise until they manually review their contact lists, creating a significant window for malicious activity. This vulnerability directly relates to CWE-20, which covers "Improper Input Validation," and represents a form of cross-site scripting or content injection attack that bypasses normal user interaction requirements.
The security implications extend beyond simple contact list manipulation, as this vulnerability demonstrates the dangerous interaction between web browsers and desktop applications in 2001-era software ecosystems. Modern security frameworks would classify this as a privilege escalation or unauthorized modification attack, potentially enabling attackers to establish persistent presence in user communication networks. The vulnerability also highlights the lack of proper content type handling and the dangers of automatic content processing in client applications. Organizations and users should consider implementing browser security policies that restrict automatic processing of specific content types, while the ICQ developers should have implemented proper content validation and user consent mechanisms.
Mitigation strategies for this vulnerability include updating to newer versions of ICQ that properly handle content type validation, implementing browser security restrictions that prevent automatic processing of application/x-icq content, and educating users about the risks of visiting untrusted websites. Network administrators should consider implementing web filtering solutions that can block or warn users about potentially malicious content types. This vulnerability also underscores the importance of secure coding practices and proper input validation in client applications, particularly those that interface with web browsers and external content sources. The issue represents a foundational security flaw that would be addressed through modern secure development lifecycle practices and adherence to security standards such as those outlined in the OWASP Top Ten and NIST cybersecurity frameworks.