CVE-2014-3698 in Pidgin
Summary
by MITRE
The jabber_idn_validate function in jutil.c in the Jabber protocol plugin in libpurple in Pidgin before 2.10.10 allows remote attackers to obtain sensitive information from process memory via a crafted XMPP message.
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Analysis
by VulDB Data Team • 02/23/2022
The vulnerability identified as CVE-2014-3698 represents a critical information disclosure flaw within the Jabber protocol implementation of Pidgin messaging client. This vulnerability resides in the jabber_idn_validate function located in the jutil.c source file, which is part of the libpurple library that provides core messaging functionality for Pidgin. The issue manifests when processing XMPP (Extensible Messaging and Presence Protocol) messages, specifically those containing crafted internationalized domain name (IDN) data that triggers improper memory handling within the validation routine.
The technical nature of this vulnerability stems from inadequate input validation and memory management within the IDN validation function. When a malicious attacker sends a specially crafted XMPP message containing malformed IDN data, the jabber_idn_validate function fails to properly handle the input, leading to memory disclosure. This occurs because the function does not adequately sanitize or bounds-check the incoming data before processing it, allowing an attacker to potentially read arbitrary memory contents from the process heap. The vulnerability is particularly dangerous as it operates at the protocol parsing layer, meaning it can be exploited through normal communication channels without requiring special privileges or authentication.
The operational impact of this vulnerability extends beyond simple information disclosure, as the leaked memory contents could potentially contain sensitive data such as session tokens, user credentials, or other confidential information that may be stored in memory during normal operation. Attackers could leverage this vulnerability to perform reconnaissance activities, gather intelligence about running processes, or potentially extract cryptographic keys and other security-sensitive data. The vulnerability affects all versions of Pidgin prior to 2.10.10, making it a significant concern for organizations and individuals using affected versions of the messaging client. This type of information disclosure vulnerability is categorized under CWE-200 (Information Exposure) and aligns with ATT&CK technique T1005 (Data from Local System) and T1041 (Exfiltration Over Command and Control Channel).
The exploitation of CVE-2014-3698 demonstrates the importance of proper input validation in security-critical code paths, particularly in protocol implementations that handle untrusted data from network sources. The vulnerability highlights the need for robust memory management practices and thorough testing of edge cases in internationalized domain name handling, which is increasingly important as messaging systems become more globally accessible. Organizations should prioritize immediate patching of affected systems and consider implementing network monitoring to detect potential exploitation attempts. The fix implemented in Pidgin 2.10.10 likely involved strengthening input validation and memory bounds checking within the jabber_idn_validate function to prevent unauthorized memory access patterns. This vulnerability serves as a reminder of the critical security considerations when implementing internationalization features in network protocols, as these features often introduce complex parsing logic that can create unexpected attack surfaces when not properly secured against malformed input conditions.