CVE-2002-1486 in Trillian
Summary
by MITRE
Multiple buffer overflows in the IRC component of Trillian 0.73 and 0.74 allows remote malicious IRC servers to cause a denial of service and possibly execute arbitrary code via (1) a large response from the server, (2) a JOIN with a long channel name, (3) a long "raw 221" message, (4) a PRIVMSG with a long nickname, or (5) a long response from an IDENT server.
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Analysis
by VulDB Data Team • 05/08/2025
The vulnerability identified as CVE-2002-1486 represents a critical security flaw in Trillian instant messaging software versions 0.73 and 0.74, specifically within its IRC protocol implementation. This vulnerability manifests as multiple buffer overflow conditions that occur when processing various IRC protocol messages from malicious servers, creating a significant attack surface for remote exploitation. The flaw stems from inadequate input validation and bounds checking within Trillian's IRC client component, which fails to properly handle oversized data payloads that exceed predetermined buffer limits. These buffer overflows occur during normal IRC protocol operations when the client receives malformed responses from IRC servers, making the vulnerability particularly dangerous as it can be triggered through legitimate network communication channels.
The technical implementation of this vulnerability spans several distinct attack vectors that exploit different aspects of the IRC protocol processing within Trillian. The first vector involves large responses from IRC servers that exceed buffer capacity, while the second targets JOIN commands with excessively long channel names that overflow memory buffers allocated for channel data processing. The third vector exploits the "raw 221" message format, which is part of the standard IRC protocol for sending user mode information, where oversized responses can trigger buffer overflows. The fourth vector targets PRIVMSG commands with extended nickname fields, while the fifth vector focuses on long responses from IDENT servers, which are used for user authentication in IRC networks. Each of these attack vectors demonstrates a fundamental flaw in input sanitization and memory management practices within the Trillian IRC client implementation.
The operational impact of CVE-2002-1486 extends beyond simple denial of service conditions to potentially enable remote code execution on vulnerable systems. When buffer overflows occur, they can corrupt adjacent memory regions and potentially overwrite critical program execution pointers, allowing attackers to inject and execute arbitrary code with the privileges of the Trillian application. This represents a severe security risk for users who may unknowingly connect to malicious IRC servers or networks, as the vulnerability can be exploited without requiring any user interaction beyond establishing a normal IRC connection. The remote nature of the attack means that malicious actors can exploit this vulnerability from anywhere on the internet, making it particularly dangerous for widespread deployment. Additionally, the denial of service component of this vulnerability can disrupt legitimate communication services, potentially affecting users who rely on Trillian for their instant messaging needs.
From a cybersecurity perspective, this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios. The attack patterns associated with CVE-2002-1486 correspond to techniques described in the MITRE ATT&CK framework under T1203 for Exploitation for Execution and T1059 for Command and Scripting Interpreter, as attackers can leverage these buffer overflows to gain unauthorized code execution capabilities. The vulnerability demonstrates poor software development practices regarding memory management and input validation, which are fundamental security requirements for network applications. Organizations and individuals using Trillian versions 0.73 and 0.74 should immediately implement mitigation strategies including software updates, network segmentation to prevent access to potentially malicious IRC servers, and monitoring for unusual network activity patterns that might indicate exploitation attempts. The vulnerability also highlights the importance of proper software security testing, particularly for network protocols that must handle untrusted data from external sources, as the lack of proper bounds checking in the IRC client component created multiple entry points for malicious exploitation.