CVE-2000-1172 in Gaim
Summary
by MITRE
Buffer overflow in Gaim 0.10.3 and earlier using the OSCAR protocol allows remote attackers to conduct a denial of service and possibly execute arbitrary commands via a long HTML tag.
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Analysis
by VulDB Data Team • 05/28/2018
The vulnerability identified as CVE-2000-1172 represents a critical buffer overflow flaw within Gaim version 0.10.3 and earlier implementations that utilize the OSCAR protocol for instant messaging communications. This protocol serves as the foundation for AOL Instant Messenger and similar messaging services, making the vulnerability particularly concerning given the widespread adoption of these platforms during the late 1990s and early 2000s. The buffer overflow occurs specifically when processing incoming HTML content within the OSCAR protocol implementation, creating a scenario where maliciously crafted data can overwhelm the allocated memory buffers.
The technical nature of this vulnerability stems from inadequate input validation and memory management within the Gaim client's HTML parsing routines. When the application receives a message containing an excessively long HTML tag, the buffer allocated for processing this content becomes insufficient to accommodate the incoming data. This overflow condition can corrupt adjacent memory locations, potentially allowing attackers to overwrite critical program variables, function pointers, or return addresses within the application's execution context. The vulnerability operates under CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows memory to be overwritten beyond its allocated boundaries.
From an operational perspective, this vulnerability presents attackers with multiple potential attack vectors that can result in severe consequences for affected systems. The primary impact manifests as a denial of service condition where the vulnerable Gaim client crashes or becomes unresponsive upon receiving the maliciously crafted HTML content. However, the more dangerous aspect emerges when the buffer overflow conditions can be manipulated to execute arbitrary code on the target system. This capability aligns with ATT&CK technique T1059, which covers the execution of commands through various attack vectors including buffer overflow exploitation. The vulnerability essentially allows remote code execution, making it a particularly attractive target for malicious actors seeking to compromise user systems through social engineering or automated exploitation campaigns.
The exploitation of this vulnerability typically involves crafting a specially formatted message containing an overly long HTML tag that exceeds the buffer capacity allocated by the Gaim client. When the client attempts to parse and render this content, the buffer overflow occurs, potentially allowing attackers to inject and execute malicious code with the privileges of the affected user. This represents a classic example of a remote code execution vulnerability that can be leveraged for persistent access to compromised systems. The impact extends beyond simple service disruption to potentially enable full system compromise, making this vulnerability particularly dangerous in enterprise environments where instant messaging clients are widely deployed.
Mitigation strategies for CVE-2000-1172 primarily focus on immediate software updates and security configuration adjustments. The most effective solution involves upgrading to Gaim versions that have patched this vulnerability, specifically versions beyond 0.10.3 where proper input validation and buffer management have been implemented. Organizations should also implement network-level filtering to restrict HTML content processing in instant messaging communications, reducing the attack surface for this type of vulnerability. Additionally, user education regarding the dangers of accepting messages from untrusted sources remains crucial in preventing exploitation, as the vulnerability often requires social engineering elements to successfully compromise systems. Security teams should also monitor for indicators of compromise related to this vulnerability and implement appropriate network detection mechanisms to identify potential exploitation attempts.