CVE-2012-3935 in Unified Presence
Summary
by MITRE
Cisco Unified Presence (CUP) before 8.6(3) and Jabber Extensible Communications Platform (aka Jabber XCP) before 5.3 allow remote attackers to cause a denial of service (process crash) via a crafted XMPP stream header, aka Bug ID CSCtu32832.
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Analysis
by VulDB Data Team • 12/13/2021
Cisco Unified Presence and Jabber Extensible Communications Platform implementations contain a vulnerability in their XMPP stream handling mechanism that enables remote attackers to trigger process crashes through specially crafted stream headers. This vulnerability exists within the parsing logic that processes incoming XMPP communication streams, specifically when handling malformed or unexpected header values that are not properly validated or sanitized before processing. The flaw allows adversaries to construct malicious XMPP packets containing crafted stream headers that, when processed by the affected systems, cause the underlying processes to terminate unexpectedly. This vulnerability affects Cisco Unified Presence versions prior to 8.6(3) and Jabber XCP versions prior to 5.3, representing a significant security concern for organizations relying on these communication platforms.
The technical nature of this vulnerability aligns with CWE-129, which describes improper validation of input boundaries, and CWE-20, which covers improper input validation in general. The flaw manifests when the system's XMPP parser encounters stream headers that exceed expected parameter limits or contain invalid character sequences that are not properly filtered during the parsing phase. This type of vulnerability falls under the category of input validation failures that can be exploited to cause denial of service conditions, where the attacker's crafted packets force the application to crash or become unresponsive. The vulnerability is particularly concerning because XMPP is a widely used protocol for instant messaging and presence information, making the affected systems prime targets for disruption attacks.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the availability of critical communication infrastructure within enterprise environments. Organizations using affected versions of these platforms may experience unexpected service interruptions that affect collaboration, presence status updates, and real-time communication capabilities. The vulnerability enables attackers to cause denial of service conditions without requiring authentication or elevated privileges, making it particularly dangerous as it can be exploited by anyone with network access to the affected systems. This creates a significant risk for business continuity, especially in environments where real-time communication is critical for operations and where the systems may be exposed to untrusted network segments.
Mitigation strategies for this vulnerability should include immediate deployment of the vendor-provided security patches and updates that address the XMPP stream header validation issues. Organizations should also implement network segmentation to limit access to these systems, apply firewall rules to filter malformed XMPP traffic, and monitor network traffic for suspicious patterns that may indicate exploitation attempts. The recommended approach involves updating to Cisco Unified Presence 8.6(3) or later versions and Jabber XCP 5.3 or later releases, which contain fixes for the stream header parsing vulnerabilities. Additionally, security teams should consider implementing intrusion detection systems that can identify and block malformed XMPP packets, and establish monitoring procedures to detect process crashes or unusual system behavior that may indicate exploitation of this vulnerability. This vulnerability demonstrates the importance of proper input validation in communication protocols and highlights the need for continuous security assessments of real-time communication infrastructure.