CVE-2005-3141 in Trillian
Summary
by MITRE
Cerulean Studios Trillian 3.0 allows remote attackers to cause a denial of service (crash) via a reverse direct connection from a different client, as demonstrated using LICQ.
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Analysis
by VulDB Data Team • 07/12/2018
The vulnerability identified as CVE-2005-3141 affects Cerulean Studios Trillian 3.0 instant messaging client, representing a significant denial of service weakness that can be exploited by remote attackers. This flaw specifically manifests when the application receives a reverse direct connection from an external client, creating a scenario where the software crashes and becomes unavailable to legitimate users. The vulnerability was demonstrated using the LICQ client, establishing a clear attack vector that exploits the application's handling of unexpected connection types.
This technical weakness stems from insufficient input validation and connection handling within the Trillian application's direct connection protocol implementation. When the software encounters a reverse direct connection from a client other than the expected one, it fails to properly process the connection request, leading to an unhandled exception that causes the application to terminate abruptly. The vulnerability resides in the application's failure to validate connection parameters and handle unexpected client behaviors gracefully, resulting in a complete service disruption.
The operational impact of this vulnerability extends beyond simple application instability, as it creates a persistent threat to communication availability for users relying on Trillian for instant messaging services. Attackers can systematically crash the application by initiating reverse direct connections, effectively denying legitimate users access to their messaging functionality. This type of denial of service attack can be particularly damaging in environments where continuous communication is critical, as it can disrupt business operations or personal communications without requiring sophisticated attack techniques or significant resources.
From a cybersecurity perspective, this vulnerability aligns with CWE-248, which addresses "Uncaught Exception" conditions in software applications, and represents a classic example of improper error handling in networked applications. The attack vector follows patterns consistent with ATT&CK technique T1499.004, which involves network denial of service attacks that target application availability. Organizations using Trillian 3.0 should implement immediate mitigations including network segmentation to prevent unauthorized access to the application, firewall rules to restrict direct connection attempts, and application-level monitoring to detect and respond to abnormal connection patterns. Additionally, upgrading to patched versions of the software represents the most effective long-term solution to address this vulnerability and prevent exploitation by malicious actors seeking to disrupt communication services.