CVE-2011-3185 in Pidgin
Summary
by MITRE
gtkutils.c in Pidgin before 2.10.0 on Windows allows user-assisted remote attackers to execute arbitrary programs via a file: URL in a message.
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Analysis
by VulDB Data Team • 04/07/2025
The vulnerability identified as CVE-2011-3185 affects Pidgin instant messaging client versions prior to 2.10.0 on Windows operating systems. This represents a critical security flaw that enables remote attackers to execute arbitrary code on vulnerable systems through crafted malicious messages containing file: URLs. The vulnerability specifically resides within the gtkutils.c source file, which handles graphical user interface utilities for the application. When a user receives a message containing a specially crafted file: URL, the application fails to properly validate or sanitize the URL before processing it, creating an execution path that can be exploited by malicious actors.
The technical implementation of this vulnerability stems from insufficient input validation and improper handling of file protocol URLs within the Pidgin messaging interface. When the application encounters a message containing a file: URL, it attempts to process the URL without adequate security checks, potentially triggering the operating system's default handler for file protocol schemes. This behavior creates a path for attackers to construct malicious URLs that can execute local programs or scripts on the victim's system. The flaw operates under CWE-74, which describes improper neutralization of special elements used in a command, and specifically relates to CWE-20, which covers improper input validation. The vulnerability essentially allows for command injection through URL handling mechanisms.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with the capability to perform arbitrary actions on compromised systems. An attacker could craft messages containing URLs that, when clicked by a victim, would execute malicious payloads such as malware installers, command shells, or other harmful programs. The user-assisted nature of this attack means that the victim must actively engage with the malicious message, typically by clicking on the URL, which makes the attack more difficult to automate but still highly effective when successful. This vulnerability directly maps to ATT&CK technique T1203, which covers exploitation for execution through malicious file URLs and command injection attacks.
Mitigation strategies for CVE-2011-3185 primarily focus on immediate patching and system hardening measures. The most effective solution is upgrading to Pidgin version 2.10.0 or later, which includes proper URL validation and sanitization mechanisms. Organizations should also implement network-level controls to monitor and filter suspicious message traffic, particularly those containing file: URLs or other protocol schemes that could be exploited. Additional defensive measures include configuring user access controls to limit the execution of downloaded content, implementing application whitelisting policies, and educating users about the risks of clicking on untrusted URLs in instant messaging applications. Security monitoring should focus on detecting unusual file protocol usage patterns and potential exploitation attempts through messaging platforms.