CVE-2014-2134 in WebEx Player
Summary
by MITRE
Heap-based buffer overflow in Cisco WebEx Recording Format (WRF) player T27 LD before SP32 EP16, T28 before T28.12, and T29 before T29.2 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted audio channel in a .wrf file, aka Bug ID CSCuc39458.
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Analysis
by VulDB Data Team • 06/19/2021
The vulnerability identified as CVE-2014-2134 represents a critical heap-based buffer overflow flaw within Cisco WebEx Recording Format player software components. This issue affects multiple versions of the T27 LD series before SP32 EP16, T28 versions prior to T28.12, and T29 versions before T29.2, making it a widespread concern across Cisco's WebEx platform implementations. The vulnerability specifically manifests when processing crafted audio channels within .wrf files, which are used for storing and replaying WebEx recordings. The flaw resides in the memory management operations of the WRF player, where insufficient bounds checking allows maliciously constructed audio data to overflow allocated heap buffers.
The technical exploitation of this vulnerability occurs through the manipulation of audio channel data within WebEx recording files, where attackers can craft specially formatted .wrf files containing malformed audio data. When the vulnerable WRF player attempts to parse and render this crafted audio channel, the buffer overflow conditions cause memory corruption that can be leveraged for arbitrary code execution or deliberate system crashes. The heap-based nature of the vulnerability means that the overflow affects dynamically allocated memory regions, potentially allowing attackers to overwrite critical memory structures or function pointers. This type of vulnerability falls under the CWE-121 heap-based buffer overflow category and aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation could enable attackers to execute malicious payloads on vulnerable systems.
The operational impact of CVE-2014-2134 extends beyond simple denial of service scenarios, as the vulnerability can be weaponized for complete system compromise. Remote attackers can exploit this weakness without requiring authentication, making it particularly dangerous in enterprise environments where WebEx recordings are frequently shared and accessed. The vulnerability affects organizations using Cisco WebEx for collaborative meetings, training sessions, and remote work scenarios, where recording files are commonly exchanged between participants. When exploited successfully, the buffer overflow can lead to complete system compromise through arbitrary code execution, allowing attackers to gain persistent access to affected systems, escalate privileges, or deploy additional malware. The memory corruption effects also create potential for information disclosure and system instability, potentially disrupting business continuity and collaborative workflows that depend on WebEx services.
Mitigation strategies for CVE-2014-2134 should prioritize immediate patch deployment from Cisco, as the vendor released security updates addressing this specific vulnerability in subsequent software releases. Organizations should implement network segmentation and access controls to limit exposure of vulnerable systems, particularly those processing untrusted WebEx recording files. Input validation measures should be enhanced at network boundaries to filter potentially malicious .wrf files before they reach end-user systems. Security monitoring should include detection of unusual memory allocation patterns and application crash events that could indicate exploitation attempts. Additionally, organizations should consider disabling WebEx recording functionality in environments where the risk is high, and implement regular security assessments of WebEx implementations. The vulnerability demonstrates the importance of proper bounds checking in memory management and highlights the critical need for regular security updates in collaborative software platforms. Organizations should also establish incident response procedures specifically addressing potential exploitation of similar buffer overflow vulnerabilities in multimedia processing components, as these types of flaws often serve as initial access vectors for broader attacks.