CVE-2007-3305 in Trillian
Summary
by MITRE
Heap-based buffer overflow in Cerulean Studios Trillian 3.x before 3.1.6.0 allows remote attackers to execute arbitrary code via a message sent through the MSN protocol, or possibly other protocols, with a crafted UTF-8 string, which triggers improper memory allocation for word wrapping when a window width is used as a buffer size, a different vulnerability than CVE-2007-2478.
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Analysis
by VulDB Data Team • 06/08/2025
This vulnerability exists in Cerulean Studios Trillian 3.x versions prior to 3.1.6.0 and represents a heap-based buffer overflow that can be exploited remotely to execute arbitrary code. The flaw specifically occurs when processing messages through the MSN protocol but may also affect other protocols within the application. The vulnerability stems from improper memory allocation during the word wrapping process when handling UTF-8 encoded strings, creating a condition where attacker-controlled input can overflow allocated memory buffers and potentially overwrite critical program execution structures. The technical implementation involves using a window width value as a buffer size parameter, which creates a direct relationship between user-supplied data and memory allocation decisions, making the system susceptible to controlled buffer overflows.
The operational impact of this vulnerability is severe as it allows remote attackers to execute arbitrary code on affected systems without requiring any local privileges or authentication. Attackers can craft malicious UTF-8 strings that, when processed by Trillian's message handling routines, trigger the buffer overflow condition. This creates a remote code execution vector that can be exploited across network boundaries, potentially allowing attackers to gain full control over vulnerable systems. The vulnerability's classification as a heap-based buffer overflow aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite heap memory. The flaw demonstrates a classic memory safety issue where dynamic memory allocation does not properly validate input sizes against allocated buffer boundaries.
The exploitation scenario involves sending specially crafted messages through the MSN protocol or potentially other supported protocols to a vulnerable Trillian client. When the client processes these messages, it attempts to perform word wrapping operations using the window width as a buffer size parameter, resulting in insufficient memory allocation for the UTF-8 string handling. This creates a condition where the application writes beyond the allocated buffer boundaries, potentially overwriting return addresses, function pointers, or other critical memory structures. The vulnerability differs from CVE-2007-2478, which indicates that multiple distinct buffer overflow conditions exist within the same software version, highlighting the complexity of memory safety issues in messaging applications. From an attack framework perspective, this vulnerability maps to ATT&CK technique T1190 for Exploit Public-Facing Application, as it represents a remote exploitation opportunity through a client application interface.
Mitigation strategies should focus on immediate patching of Trillian to version 3.1.6.0 or later, which contains the necessary memory allocation fixes and bounds checking improvements. Organizations should also implement network-based restrictions such as firewall rules that limit access to MSN protocol ports and other messaging services to reduce attack surface. Additionally, network monitoring should be enhanced to detect unusual message patterns that might indicate exploitation attempts. The fix likely involves implementing proper bounds checking for buffer size calculations when processing UTF-8 strings and ensuring that window width parameters are validated before being used as buffer size determinants. Security teams should also consider implementing application whitelisting controls to restrict execution of untrusted messaging applications and maintain regular vulnerability assessments of messaging clients to identify similar memory safety issues.