CVE-2013-3393 in Virtualization Experience Media Engine
Summary
by MITRE
The Precision Video Engine component in Cisco Jabber for Windows and Cisco Virtualization Experience Media Engine allows remote attackers to cause a denial of service (process crash and call disconnection) via crafted RTP packets, aka Bug IDs CSCuh60706 and CSCue21117.
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Analysis
by VulDB Data Team • 02/28/2019
The vulnerability identified as CVE-2013-3393 affects the Precision Video Engine component within Cisco Jabber for Windows and the Cisco Virtualization Experience Media Engine, representing a critical security flaw that enables remote attackers to execute denial of service attacks against affected systems. This vulnerability specifically targets the handling of Real-time Transport Protocol packets, which form the backbone of multimedia communications in VoIP and video conferencing applications. The flaw manifests when the affected components receive malformed or specially crafted RTP packets that trigger unexpected behavior in the media processing engine, leading to complete application crashes and subsequent call disconnections.
The technical implementation of this vulnerability stems from insufficient input validation and error handling within the RTP packet processing logic of the affected Cisco products. When the Precision Video Engine receives maliciously constructed RTP packets, it fails to properly validate the packet headers and payload data, causing the media engine to enter an unstable state that results in process termination. This behavior aligns with CWE-129, Input Validation, and CWE-248, Uncaught Exception, as the system does not adequately protect against malformed input data that could lead to unexpected program termination. The vulnerability exists at the intersection of network protocol handling and application stability, where the lack of robust packet validation creates an exploitable condition that remote attackers can leverage without requiring authentication or privileged access.
The operational impact of this vulnerability extends beyond simple service disruption, as it can severely compromise the reliability and availability of communication systems within enterprise environments. Organizations relying on Cisco Jabber for Windows and Cisco Virtualization Experience for their collaborative communications may experience frequent call failures, interrupted video conferences, and general degradation of service quality. The remote nature of the attack means that threat actors can exploit this vulnerability from outside the network perimeter, potentially affecting users across different geographical locations and network segments. This creates significant business continuity risks, particularly in mission-critical environments where uninterrupted communication is essential for operations. The vulnerability also aligns with ATT&CK technique T1499.004, Network Denial of Service, and T1566.001, Spearphishing Attachment, as attackers could potentially combine this vulnerability with social engineering tactics to maximize impact.
Mitigation strategies for CVE-2013-3393 should prioritize immediate patch deployment from Cisco, as the vendor has released security advisories and software updates addressing this specific vulnerability. Organizations should implement network segmentation and monitoring to detect anomalous RTP traffic patterns that might indicate exploitation attempts, utilizing intrusion detection systems that can identify malformed packet structures. The principle of least privilege should be enforced by restricting unnecessary network access to affected systems and implementing firewalls that can filter suspicious RTP traffic. Additionally, network administrators should consider deploying rate limiting and packet filtering mechanisms to prevent the propagation of malicious packets within the network infrastructure. Regular security assessments and vulnerability scanning should be conducted to identify any potential unpatched systems within the organization's attack surface, while maintaining detailed logging of network traffic to facilitate forensic analysis in case of successful exploitation attempts.