CVE-2013-2223 in ZRTPCPP
Summary
by MITRE
GNU ZRTPCPP before 3.2.0 allows remote attackers to obtain sensitive information (uninitialized heap memory) or cause a denial of service (out-of-bounds read) via a crafted packet, as demonstrated by a truncated Ping packet that is not properly handled by the getEpHash function.
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Analysis
by VulDB Data Team • 01/08/2022
The vulnerability identified as CVE-2013-2223 affects GNU ZRTPCPP versions prior to 3.2.0, representing a critical security flaw in the ZRTP cryptographic protocol implementation used for securing voice and video communications. This vulnerability stems from improper handling of crafted network packets, specifically truncated Ping packets that fail to be adequately processed by the getEpHash function within the library. The issue exposes fundamental weaknesses in input validation and memory management practices that are essential for secure real-time communication protocols.
The technical flaw manifests through two primary attack vectors that demonstrate poor memory handling and input validation. Attackers can exploit uninitialized heap memory access by sending specially crafted packets that trigger the getEpHash function to read from memory locations that have not been properly initialized. This creates potential information disclosure scenarios where sensitive data from adjacent memory regions could be exposed to unauthorized parties. Additionally, the vulnerability enables out-of-bounds read conditions when processing truncated Ping packets, which can lead to denial of service attacks by causing the application to crash or behave unpredictably. The root cause lies in insufficient bounds checking and validation of packet data before processing, particularly in the cryptographic hash computation functions that are critical for ZRTP protocol integrity.
The operational impact of this vulnerability extends beyond simple information disclosure, as it fundamentally undermines the security and reliability of communications systems that rely on GNU ZRTPCPP for secure voice and video transmission. Organizations deploying affected versions face potential data leakage from memory dumps, system instability leading to service disruption, and possible exploitation for more sophisticated attacks targeting the underlying cryptographic infrastructure. The vulnerability affects real-time communication systems where ZRTP protocol is implemented, including VoIP systems, video conferencing platforms, and other applications requiring secure media streaming. This represents a significant risk to enterprise communications infrastructure where confidentiality and availability are paramount for business continuity and regulatory compliance.
Mitigation strategies should prioritize immediate upgrade to GNU ZRTPCPP version 3.2.0 or later, which includes proper bounds checking and input validation for packet processing. Network administrators should implement packet filtering rules to identify and block malformed ZRTP packets, particularly those with truncated Ping structures. Additional defensive measures include monitoring for unusual network traffic patterns that may indicate exploitation attempts and implementing memory protection mechanisms such as stack canaries and address space layout randomization. Security teams should conduct vulnerability assessments across all systems utilizing ZRTP protocol implementations and ensure proper input sanitization practices are enforced throughout the communication stack. This vulnerability aligns with CWE-125 for out-of-bounds read and CWE-248 for uninitialized memory access, while potentially mapping to ATT&CK techniques involving privilege escalation through memory corruption and denial of service operations. Organizations must also consider the broader implications for their secure communication infrastructure and implement comprehensive monitoring solutions to detect potential exploitation attempts.