CVE-2012-1336 in WebEx Player
Summary
by MITRE
Buffer overflow in the Cisco WebEx Recording Format (WRF) player T27 L through SP11 EP26, T27 LB through SP21 EP10, T27 LC before SP25 EP10, and T27 LD before SP32 CP1 allows remote attackers to execute arbitrary code via a crafted WRF file, a different vulnerability than CVE-2012-1335 and CVE-2012-1337.
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Analysis
by VulDB Data Team • 03/22/2021
The vulnerability identified as CVE-2012-1336 represents a critical buffer overflow flaw within Cisco WebEx Recording Format player software across multiple version ranges including T27 L through SP11 EP26, T27 LB through SP21 EP10, T27 LC before SP25 EP10, and T27 LD before SP32 CP1. This vulnerability specifically affects the parsing mechanism of WRF files which are used to store and playback Cisco WebEx meeting recordings, making it a significant threat to organizations relying on collaborative meeting platforms. The flaw exists in the handling of malformed WRF file structures that can trigger memory corruption during the playback process, creating an opportunity for remote code execution.
The technical implementation of this vulnerability stems from inadequate input validation within the WRF player's file parsing routines. When processing specially crafted WRF files, the software fails to properly bounds-check data structures, allowing attackers to overflow buffer allocations and overwrite adjacent memory regions. This memory corruption can be leveraged to redirect execution flow to malicious code injected by the attacker, effectively enabling remote code execution without requiring authentication. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, where insufficient bounds checking allows data to be written beyond the allocated buffer boundaries, and it aligns with ATT&CK technique T1059.007 for command and scripting interpreter execution through malicious file formats.
The operational impact of CVE-2012-1336 extends beyond simple remote code execution as it provides attackers with persistent access to target systems through the WebEx recording format player. Organizations utilizing Cisco WebEx for business meetings and collaboration face significant risk since WRF files can be distributed through legitimate channels such as email attachments, shared drives, or meeting recording repositories. The vulnerability's classification as a remote attack vector means that exploitation can occur without any local system access, making it particularly dangerous for enterprise environments where meeting recordings are frequently shared across networks. Attackers can craft malicious WRF files that, when opened by an unpatched WebEx player, would execute arbitrary commands with the privileges of the user running the player application.
Mitigation strategies for CVE-2012-1336 should prioritize immediate patch deployment from Cisco as the primary defense mechanism, given the severity of the vulnerability. Organizations must ensure all affected WebEx player versions are updated to patched releases that include proper input validation and bounds checking mechanisms. Network segmentation and access controls should be implemented to limit exposure of systems running the vulnerable software, while email filtering solutions should be configured to block suspicious WRF file attachments. Additionally, security awareness training should emphasize the dangers of opening untrusted WRF files, and system administrators should monitor for unusual network activity that might indicate exploitation attempts. The vulnerability demonstrates the importance of secure coding practices and proper memory management in multimedia processing applications, highlighting the need for comprehensive input validation across all file format parsers.