CVE-2005-0472 in Gaim
Summary
by MITRE
Gaim before 1.1.3 allows remote attackers to cause a denial of service (infinite loop) via malformed SNAC packets from (1) AIM or (2) ICQ.
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Analysis
by VulDB Data Team • 01/19/2025
The vulnerability identified as CVE-2005-0472 affects Gaim versions prior to 1.1.3 and represents a significant denial of service flaw that can be exploited by remote attackers through malformed SNAC packets. This issue specifically impacts two major instant messaging protocols: AOL Instant Messenger and ICQ. The vulnerability stems from inadequate input validation and processing of network packets within the Gaim client's communication stack, creating a condition where malformed SNAC (Service Navigation and Control) packets can trigger an infinite loop in the application's processing logic.
SNAC packets serve as the fundamental communication protocol within the AOL Instant Messenger and ICQ ecosystems, handling various messaging operations and service interactions. The flaw occurs when Gaim receives malformed SNAC packets that contain unexpected data structures or invalid sequence numbers that the client's parser cannot properly handle. The vulnerability is classified under CWE-121, which deals with stack-based buffer overflow conditions, though in this case the specific manifestation results in an infinite loop rather than a traditional buffer overflow. This type of vulnerability falls under the broader category of malformed input processing issues that can be exploited to consume system resources and cause application instability.
The operational impact of this vulnerability extends beyond simple service disruption, as it can be leveraged by attackers to create persistent denial of service conditions that may require manual intervention to resolve. When an attacker sends specially crafted malformed SNAC packets to a vulnerable Gaim client, the application enters an infinite loop during packet processing, causing the client to become unresponsive and effectively rendering the instant messaging service unavailable. This vulnerability is particularly concerning because it can be exploited remotely without requiring authentication or prior access to the target system, making it a prime candidate for widespread exploitation. The attack vector aligns with ATT&CK technique T1499.004, which involves network denial of service attacks, and represents a classic example of how protocol parsing vulnerabilities can be weaponized to compromise system availability.
Mitigation strategies for CVE-2005-0472 primarily involve upgrading to Gaim version 1.1.3 or later, which includes proper input validation and error handling for SNAC packet processing. System administrators should also implement network monitoring to detect unusual packet patterns that might indicate exploitation attempts, and consider deploying network segmentation to limit the impact of potential attacks. The fix implemented in version 1.1.3 likely includes enhanced packet validation routines that either reject malformed SNAC packets immediately or implement proper loop detection mechanisms to prevent the infinite loop condition. Organizations using older versions of Gaim should also consider implementing firewall rules that limit incoming connections to specific ports used by these instant messaging protocols, although this approach provides only partial protection against the vulnerability. Additionally, regular security updates and patch management processes should be enforced to ensure that all instant messaging clients and related software components remain current with the latest security fixes.