CVE-2012-2369 in pidgin-otr
Summary
by MITRE
Format string vulnerability in the log_message_cb function in otr-plugin.c in the Off-the-Record Messaging (OTR) pidgin-otr plugin before 3.2.1 for Pidgin might allow remote attackers to execute arbitrary code via format string specifiers in data that generates a log message.
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Analysis
by VulDB Data Team • 12/31/2024
The CVE-2012-2369 vulnerability represents a critical format string vulnerability within the Off-the-Record Messaging plugin for Pidgin messaging client. This flaw exists in the log_message_cb function located in the otr-plugin.c file, affecting versions prior to 3.2.1. The vulnerability arises when the plugin processes incoming data that generates log messages, creating a scenario where remote attackers can inject malicious format specifiers into the logging mechanism. The issue stems from improper input validation and handling of user-supplied data within the logging function, which directly interprets and processes format strings without adequate sanitization. This type of vulnerability falls under CWE-134 which specifically addresses the use of format strings with user-supplied data, making it a well-documented and dangerous class of vulnerability that has been exploited in numerous security incidents.
The operational impact of this vulnerability is severe as it enables remote code execution capabilities for attackers who can craft malicious messages containing format string specifiers. When the vulnerable plugin processes these messages and logs them, the format string vulnerability allows attackers to manipulate the program's execution flow by injecting specific format specifiers that can read from or write to memory locations. This can lead to arbitrary code execution on the victim's system, potentially allowing attackers to gain full control over the affected Pidgin installation. The vulnerability is particularly dangerous because it operates within a messaging application where users frequently receive data from unknown or untrusted sources, making exploitation relatively straightforward. The attack vector requires only that a malicious actor send specially crafted messages to a victim who has the vulnerable OTR plugin installed, making this a passive yet highly impactful threat.
Mitigation strategies for CVE-2012-2369 involve immediate patching of the affected OTR plugin to version 3.2.1 or later, which contains the necessary fixes to properly handle format strings in log messages. System administrators should also implement network-level controls to monitor for unusual logging activity that might indicate exploitation attempts, though this represents a reactive approach rather than a preventive one. The vulnerability aligns with ATT&CK technique T1059.007 which covers command and scripting interpreter usage, as exploitation could enable attackers to execute arbitrary commands on the compromised system. Additionally, this vulnerability demonstrates the importance of proper input validation and the principle of least privilege in software development, as the flaw could have been prevented through better defensive programming practices. Organizations should also consider implementing application whitelisting policies to prevent execution of untrusted plugins and maintain comprehensive monitoring of system logs for signs of exploitation attempts. The fix implemented in version 3.2.1 likely involved proper sanitization of user data before logging and the use of secure logging functions that do not interpret format specifiers from untrusted sources, thereby preventing the exploitation scenario described in the vulnerability report.