CVE-2007-2479 in Trillian Pro
Summary
by MITRE
Cerulean Studios Trillian Pro before 3.1.5.1 allows remote attackers to obtain potentially sensitive information via long CTCP PING messages that contain UTF-8 characters, which generates a malformed response that is not truncated by a newline, which can cause portions of a server message to be sent to the attacker.
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Analysis
by VulDB Data Team • 07/18/2019
The vulnerability described in CVE-2007-2479 affects Cerulean Studios Trillian Pro version 3.1.5.1 and earlier, representing a classic information disclosure flaw that exploits improper handling of CTCP PING messages within IRC client software. This vulnerability specifically targets the protocol implementation in Trillian Pro's IRC client component where it fails to properly sanitize or truncate incoming CTCP PING messages containing UTF-8 characters, creating a condition where sensitive server information can be inadvertently exposed to remote attackers.
The technical mechanism behind this vulnerability involves the improper processing of CTCP (Client-to-Client Protocol) PING messages that contain UTF-8 encoded characters. When a malicious attacker sends a specially crafted CTCP PING message with extended UTF-8 content, the Trillian Pro client processes this message without adequate truncation or sanitization. This processing error results in a malformed response that lacks proper newline termination, allowing portions of server-generated messages to be transmitted to the attacker. The vulnerability stems from inadequate input validation and buffer management within the IRC client's message handling routines, creating a situation where the client's response buffer is not properly bounded, leading to information leakage.
From an operational perspective, this vulnerability presents significant security implications for users of Trillian Pro, as it enables remote attackers to potentially extract sensitive information from server responses that would normally be protected from direct client access. The exposure can include server internal state information, user session details, or other potentially confidential data that the server might send in response to malformed requests. This type of information disclosure can serve as a stepping stone for more sophisticated attacks, as attackers can gather intelligence about the target server environment, potentially identifying vulnerabilities in the server implementation or gathering user information that could be leveraged in subsequent attacks. The vulnerability operates at the application layer and can be exploited without requiring authentication, making it particularly dangerous in environments where Trillian Pro clients are connected to public or untrusted IRC networks.
The vulnerability aligns with CWE-20, which describes "Improper Input Validation" and CWE-122, which addresses "Heap-based Buffer Overflow," though the specific implementation here involves improper response handling rather than direct buffer overflows. From an ATT&CK framework perspective, this vulnerability maps to T1083 (File and Directory Discovery) and T1046 (Network Service Scanning) as attackers can use this information disclosure to gather more information about the target network environment and potentially identify other vulnerable systems. The attack surface is primarily through network-based communication channels where the IRC protocol is used, and the vulnerability affects systems that process CTCP messages in a manner that fails to properly handle extended character sets. Organizations should implement immediate mitigations including updating to Trillian Pro version 3.1.5.1 or later, implementing network-level filtering to restrict CTCP message processing, and monitoring for unusual CTCP message patterns that might indicate exploitation attempts. Additionally, system administrators should consider implementing network segmentation and access controls to limit the potential impact of such information disclosure vulnerabilities, as they can serve as reconnaissance tools for more comprehensive attacks against the target infrastructure.