CVE-2002-0785 in Instant Messenger
Summary
by MITRE
AOL Instant Messenger (AIM) allows remote attackers to cause a denial of service (crash) via an "AddBuddy" link with the ScreenName parameter set to a large number of comma-separated values, possibly triggering a buffer overflow.
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Analysis
by VulDB Data Team • 06/25/2024
The vulnerability identified as CVE-2002-0785 represents a classic buffer overflow flaw within AOL Instant Messenger version 4.8 and earlier versions. This security weakness specifically manifests when the application processes an "AddBuddy" link containing a ScreenName parameter with an excessive number of comma-separated values. The flaw stems from inadequate input validation and boundary checking mechanisms within the AIM client software, which fails to properly handle malformed or excessively long input strings. The vulnerability operates at the application layer of the network stack, exploiting a fundamental programming error where the software does not enforce proper bounds checking on user-supplied data before processing it in memory.
The technical implementation of this vulnerability demonstrates a clear violation of secure coding practices and aligns with CWE-121, which addresses stack-based buffer overflow conditions. When an attacker crafts a malicious AddBuddy link with an excessive number of comma-separated screen names, the AIM client attempts to parse this input without sufficient validation, leading to memory corruption that ultimately results in application crash or complete system freeze. The buffer overflow occurs because the software allocates a fixed-size buffer to store the screen name information but fails to verify that the incoming data fits within these predetermined boundaries. This type of vulnerability falls under the category of remote code execution risks, though in this specific case it manifests as a denial of service rather than arbitrary code execution.
The operational impact of CVE-2002-0785 extends beyond simple service disruption, as it represents a significant security weakness that could be exploited in larger attack campaigns. The vulnerability affects users who are unknowingly exposed to malicious links through social engineering tactics, phishing emails, or compromised websites that host the malicious AddBuddy links. Attackers can leverage this flaw to systematically disrupt communication services for targeted individuals or organizations, potentially causing business disruption and loss of productivity. From an attacker's perspective, this vulnerability represents an easy-to-exploit vector that requires minimal technical skill to implement, making it attractive for both casual attackers and more sophisticated threat actors. The flaw also demonstrates poor software quality assurance practices and highlights the importance of input sanitization in client-side applications.
Mitigation strategies for this vulnerability encompass both immediate remediation and long-term architectural improvements. Users should immediately upgrade to AIM version 4.9 or later, which includes proper input validation and boundary checking mechanisms. Organizations implementing security controls should deploy network-based intrusion detection systems that can identify and block malicious AddBuddy link patterns, particularly those containing excessive comma-separated values. The implementation of web application firewalls and content filtering solutions can help prevent users from accessing malicious links before they reach the AIM client. Additionally, security awareness training programs should educate users about the dangers of clicking unknown links and the importance of verifying the legitimacy of communication requests. This vulnerability also underscores the necessity of implementing proper software development lifecycle security practices, including code reviews, static analysis tools, and dynamic testing to identify and prevent similar buffer overflow conditions in future software releases. The flaw serves as a historical example of how insufficient input validation can lead to critical security vulnerabilities in widely deployed instant messaging applications, emphasizing the need for robust security testing and quality assurance processes in software development.