CVE-2004-1231 in Instant Messenger
Summary
by MITRE
Directory traversal vulnerability in Gadu-Gadu allows remote attackers to read arbitrary files via .. (dot dot) sequences in a DCC connection with a CTCP packet that contains a 1 as the type and a 4 as the subtype.
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Analysis
by VulDB Data Team • 07/21/2017
The vulnerability described in CVE-2004-1231 represents a directory traversal flaw within the Gadu-Gadu instant messaging client protocol implementation. This security weakness specifically affects the DCC (Direct Client-to-Client) connection handling mechanism that operates through CTCP (Client-to-Client Protocol) packets. The vulnerability stems from insufficient input validation and path sanitization within the client's processing of incoming CTCP packets, particularly those with specific type and subtype values. The flaw enables malicious actors to exploit the protocol's file handling mechanisms by crafting specially formatted CTCP packets containing directory traversal sequences.
The technical implementation of this vulnerability occurs when the Gadu-Gadu client processes incoming DCC connections through CTCP packets that specify a type value of 1 and a subtype value of 4. When these packets contain .. (dot dot) sequences in their payload, the client fails to properly validate or sanitize the file paths, allowing attackers to navigate outside the intended directory boundaries. This improper validation creates an opportunity for arbitrary file access, where an attacker can potentially read sensitive files from the victim's system that should otherwise remain protected. The vulnerability operates at the application layer and specifically targets the file system access controls implemented within the client's DCC protocol handler.
From an operational perspective, this vulnerability poses significant risks to users of the Gadu-Gadu messaging service, particularly in environments where the client runs with elevated privileges or has access to sensitive system files. Attackers can leverage this weakness to access configuration files, user credentials, or other sensitive data stored on the target system. The remote nature of the attack means that exploitation does not require local system access, making it particularly dangerous for users who may be connected to untrusted networks or who receive messages from malicious parties. The vulnerability can be exploited through social engineering tactics where attackers send specially crafted CTCP packets to unsuspecting users, potentially leading to information disclosure and further compromise of the affected systems.
The security implications of this vulnerability align with CWE-22, which identifies improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. This weakness creates a direct pathway for attackers to bypass normal access controls and retrieve unauthorized files from the system. The vulnerability also maps to several ATT&CK techniques including T1059 for command and scripting interpreter usage and T1566 for credential access through social engineering. Organizations should implement immediate mitigations including updating to patched versions of the Gadu-Gadu client, implementing network segmentation to limit exposure, and monitoring for suspicious CTCP packet patterns. Additionally, users should be educated about the risks of accepting messages from untrusted sources and the importance of keeping their client software updated to prevent exploitation of this and similar vulnerabilities.