CVE-2012-3938 in WebEx Recording Format Player
Summary
by MITRE
Buffer overflow in the Cisco WebEx Recording Format (WRF) player T27 before LD SP32 EP10 and T28 before T28.4 allows remote attackers to execute arbitrary code via a crafted WRF file, aka Bug ID CSCtz73583.
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Analysis
by VulDB Data Team • 04/18/2021
The vulnerability identified as CVE-2012-3938 represents a critical buffer overflow flaw within the Cisco WebEx Recording Format player software, specifically affecting versions prior to LD SP32 EP10 for T27 and T28 before T28.4. This issue resides in the handling of WRF files, which are used to store and playback Cisco WebEx recordings, making it a significant concern for organizations relying on collaborative video conferencing solutions. The flaw enables remote code execution through the manipulation of WRF file structures, potentially allowing attackers to gain unauthorized control over affected systems.
The technical implementation of this vulnerability stems from inadequate input validation within the WRF player's parsing mechanism. When the player processes a maliciously crafted WRF file, it fails to properly bounds-check data structures, leading to memory corruption that can be exploited to overwrite critical memory locations. This buffer overflow condition occurs during the interpretation of specific file headers or data segments within the WRF format, where attacker-controlled data exceeds the allocated buffer space. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and more specifically with CWE-125, which addresses out-of-bounds read conditions that can lead to arbitrary code execution.
The operational impact of this vulnerability extends beyond simple remote code execution, as it represents a sophisticated attack vector that can be leveraged in various threat scenarios. Attackers can craft malicious WRF files that, when opened by an unsuspecting user, will trigger the buffer overflow and provide them with a remote execution environment on the target system. This vulnerability is particularly concerning in enterprise environments where WebEx is widely deployed for meetings and collaboration, as it can serve as an initial access point for broader network infiltration. The attack surface is amplified by the widespread adoption of Cisco WebEx solutions, making this vulnerability a prime target for advanced persistent threats.
Organizations affected by this vulnerability should implement immediate mitigations including prompt application of Cisco's security patches and updates, which address the buffer overflow through proper input validation and memory management controls. Network segmentation and access controls should be enforced to limit exposure of systems running the vulnerable WRF player, while security awareness training can help prevent users from opening untrusted WRF files. The mitigation strategy should also include monitoring for suspicious file execution patterns and implementing endpoint protection solutions that can detect and block malicious WRF file handling. From an ATT&CK framework perspective, this vulnerability maps to techniques involving execution through fileless methods and privilege escalation, with potential lateral movement capabilities once initial compromise is achieved. Regular security assessments and vulnerability scanning should be conducted to identify and remediate similar issues in other collaboration tools and media players within the enterprise environment.