CVE-2012-3374 in Pidgin
Summary
by MITRE
Buffer overflow in markup.c in the MXit protocol plugin in libpurple in Pidgin before 2.10.5 allows remote attackers to execute arbitrary code via a crafted inline image in a message.
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Analysis
by VulDB Data Team • 03/26/2021
The vulnerability identified as CVE-2012-3374 represents a critical buffer overflow flaw within the MXit protocol plugin of libpurple, the core messaging library underlying Pidgin instant messaging software. This issue affects Pidgin versions prior to 2.10.5 and stems from improper handling of inline image data within markup processing functions. The flaw exists in the markup.c file where the application fails to adequately validate the size of incoming image data before copying it into fixed-size buffers, creating an exploitable condition that can be triggered through crafted malicious messages.
The technical nature of this vulnerability aligns with CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The MXit protocol plugin specifically processes inline image data within chat messages, and when a remote attacker crafts a message containing malformed image parameters, the vulnerable code attempts to copy this data into a buffer without proper size validation. This allows the attacker to overflow the allocated buffer space and potentially overwrite critical memory segments including return addresses, function pointers, or other control data structures within the program's execution context.
From an operational perspective, this vulnerability creates a significant threat vector for remote code execution attacks, enabling adversaries to gain unauthorized control over affected systems. The attack requires only that a victim receive a specially crafted message containing malicious inline image data, making it particularly dangerous in environments where users regularly communicate with untrusted parties. The exploitability of this flaw means that attackers could execute arbitrary code with the privileges of the affected user, potentially leading to complete system compromise, data exfiltration, or use as a foothold for further network infiltration. This vulnerability particularly impacts enterprise environments where Pidgin is used for internal communications, as it could be leveraged to establish persistent access points within networks.
The mitigation strategy for this vulnerability involves immediate upgrading to Pidgin version 2.10.5 or later, which includes proper bounds checking and input validation for inline image processing within the MXit protocol plugin. System administrators should also implement network-level controls to monitor and filter suspicious messaging traffic, particularly when users are communicating with external parties. Additionally, organizations should consider implementing user education programs to raise awareness about the risks of accepting messages from untrusted sources, as well as deploying intrusion detection systems that can identify anomalous messaging patterns. The vulnerability demonstrates the importance of proper input validation and memory management practices in messaging applications, aligning with ATT&CK technique T1059.007 for execution through scripting and T1133 for persistence mechanisms that attackers might employ after initial compromise. Organizations should also conduct regular security assessments of their messaging infrastructure to identify similar vulnerabilities in other protocol plugins or third-party components that might be susceptible to similar buffer overflow conditions.