CVE-2002-2173 in Trillian
Summary
by MITRE
Buffer overflow in the IRC module of Trillian 0.725 and 0.73 allowing remote attackers to execute arbitrary code via a long DCC Chat message.
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Analysis
by VulDB Data Team • 07/11/2024
The vulnerability described in CVE-2002-2173 represents a critical buffer overflow flaw within the IRC module of Trillian instant messaging client version 0.725 and 0.73. This security weakness specifically targets the handling of Direct Client-to-Client chat messages, which are commonly used in IRC networks for file transfers and direct communication between users. The vulnerability arises from insufficient input validation and bounds checking when processing incoming DCC chat messages, creating an exploitable condition that can be leveraged by remote attackers to gain unauthorized control over affected systems. The buffer overflow occurs when the application fails to properly validate the length of incoming data, allowing an attacker to exceed the allocated buffer space and overwrite adjacent memory regions.
The technical implementation of this vulnerability aligns with CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows attackers to write beyond allocated memory boundaries. This particular flaw operates through the DCC chat protocol implementation within Trillian's IRC module, where the application processes incoming chat messages without adequate length verification. When a maliciously crafted DCC chat message exceeds the buffer capacity, it causes a stack-based buffer overflow that can be manipulated to overwrite return addresses and execution pointers. The vulnerability is classified as a remote code execution flaw because attackers can exploit it from outside the local network without requiring any local access or authentication. The attack vector specifically targets the IRC client's message parsing functionality, making it particularly dangerous in environments where users frequently interact with external contacts or participate in public IRC channels.
The operational impact of CVE-2002-2173 extends beyond simple system compromise, as it provides attackers with complete control over vulnerable systems through remote code execution capabilities. Once successfully exploited, the vulnerability allows threat actors to execute arbitrary code with the privileges of the affected user, potentially leading to full system compromise, data exfiltration, or establishment of persistent backdoors. The vulnerability affects a widely used instant messaging application, increasing its potential attack surface and making it a prime target for exploitation in botnet activities or targeted attacks against corporate networks. Organizations using Trillian versions 0.725 and 0.73 are particularly vulnerable because the flaw exists in the core messaging functionality that is essential for normal operation, making it difficult to disable the vulnerable component without completely removing the application. The exploitation process typically involves crafting a specially formatted DCC chat message that triggers the buffer overflow condition, potentially requiring minimal user interaction beyond receiving the malicious communication.
Mitigation strategies for this vulnerability must focus on immediate remediation through software updates and patches provided by the vendor, as well as network-level protections to prevent exploitation attempts. The most effective approach involves upgrading to Trillian versions that have addressed this buffer overflow condition through proper input validation and bounds checking mechanisms. Security administrators should implement network segmentation and access controls to limit exposure to potentially compromised systems while awaiting patch deployment. Additional protective measures include configuring firewalls to restrict DCC chat functionality or disabling it entirely in corporate environments where such communications are not essential. The vulnerability also highlights the importance of input validation practices and adheres to ATT&CK technique T1203, which covers exploitation of software vulnerabilities for privilege escalation and remote code execution. Organizations should conduct vulnerability assessments to identify all instances of affected Trillian versions and implement comprehensive monitoring to detect potential exploitation attempts. The remediation process must also include user education regarding the risks of accepting unsolicited DCC chat requests and the importance of maintaining current software versions to prevent exploitation of known vulnerabilities.