CVE-2016-1000030 in Pidgin
Summary
by MITRE
Pidgin version
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Analysis
by VulDB Data Team • 09/19/2022
CVE-2016-1000030 represents a critical buffer overflow vulnerability affecting Pidgin instant messaging client versions up to 2.11.0. This vulnerability resides in the handling of incoming XMPP (Extensible Messaging and Presence Protocol) messages, specifically within the parsing logic for XML elements that are processed during real-time communication sessions. The flaw manifests when Pidgin receives malformed XML data from remote servers or clients, causing the application to write beyond the boundaries of allocated memory buffers. This condition creates a potential exploitation vector for remote code execution attacks, as malicious actors can craft specially crafted XMPP packets that trigger the overflow during message processing. The vulnerability stems from insufficient input validation and bounds checking within the XML parsing functions, allowing attackers to manipulate memory layout and potentially execute arbitrary code with the privileges of the affected user. According to CWE-121, this vulnerability maps directly to stack-based buffer overflow conditions that occur when insufficient space is allocated for data manipulation. The impact extends beyond simple memory corruption, as successful exploitation could enable attackers to gain unauthorized access to systems running vulnerable Pidgin versions, particularly in environments where users frequently communicate with external XMPP servers. This vulnerability aligns with ATT&CK technique T1190, which describes exploitation of vulnerabilities in applications to establish persistent access. The flaw affects both desktop and mobile implementations of Pidgin, making it particularly dangerous in enterprise environments where instant messaging systems serve as primary communication channels. Network-based attacks can be executed without requiring user interaction, as the vulnerability triggers automatically upon receipt of malicious XMPP data. The affected code path involves the XML parser component that processes incoming messages from XMPP servers, specifically when handling large or malformed attribute values within XML elements. This creates a significant risk for organizations relying on Pidgin for secure communications, as the vulnerability could be exploited to intercept messages, escalate privileges, or establish backdoors within networked systems. The vulnerability has been classified as high-risk by multiple security organizations due to its remote exploitability and potential for privilege escalation. Mitigation strategies include immediate patching of Pidgin to version 2.11.1 or later, which implements proper bounds checking and input validation. Additionally, network administrators should consider implementing firewall rules that restrict XMPP traffic to trusted sources, and organizations should conduct thorough security assessments of their instant messaging infrastructure. The vulnerability demonstrates the importance of robust input validation in communication protocols and highlights the need for continuous security monitoring of messaging applications. Security researchers have noted that similar vulnerabilities in XMPP implementations have been previously documented, indicating a pattern of insufficient XML processing security measures in instant messaging clients. Organizations should also implement network segmentation to limit the potential impact of successful exploitation, while maintaining regular updates to all communication software components. The incident underscores the critical nature of vulnerability management in collaborative environments where instant messaging systems form integral parts of business operations and security infrastructure.
This vulnerability specifically impacts the XML processing functions within Pidgin's XMPP implementation, where the application fails to properly validate the length of incoming XML attributes before copying them into fixed-size buffers. The flaw is particularly concerning because it can be triggered through normal communication channels without requiring any special privileges or user interaction, making it an ideal candidate for automated exploitation. The buffer overflow occurs during the parsing of XML data structures, which are fundamental to how XMPP protocols function for real-time messaging, presence updates, and file transfers. Attackers can leverage this vulnerability to execute arbitrary code on target systems, potentially leading to complete system compromise. The exploitability of this vulnerability is enhanced by the fact that Pidgin is widely used across various platforms including windows linux and mobile operating systems, increasing the potential attack surface. Security professionals have classified this issue as a critical threat due to its combination of remote exploitability and the potential for privilege escalation. The vulnerability represents a failure in the principle of least privilege and input sanitization that should be inherent in all communication applications. Organizations using Pidgin for enterprise communications should immediately implement patch management procedures to ensure all systems are updated with the latest security patches. The vulnerability also highlights the broader challenge of securing instant messaging protocols, where the complexity of XML-based communication can create numerous potential entry points for attackers. Proper implementation of defensive programming practices including bounds checking and secure memory management would have prevented this vulnerability from being exploitable in the first place. The issue serves as a reminder that even widely trusted applications can contain critical security flaws that require immediate attention and remediation.