CVE-2017-12372 in WebEx Network Recording Player
Summary
by MITRE
A "Cisco WebEx Network Recording Player Remote Code Execution Vulnerability" exists in Cisco WebEx Network Recording Player for Advanced Recording Format (ARF) and WebEx Recording Format (WRF) files. A remote attacker could exploit this by providing a user with a malicious ARF or WRF file via email or URL and convincing the user to launch the file. Exploitation of this could cause an affected player to crash and, in some cases, could allow arbitrary code execution on the system of a targeted user. Cisco Bug IDs: CSCvf57234, CSCvg54868, CSCvg54870.
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Analysis
by VulDB Data Team • 01/25/2021
The Cisco WebEx Network Recording Player remote code execution vulnerability represents a critical security flaw that undermines the integrity of enterprise communication systems. This vulnerability specifically targets the Advanced Recording Format and WebEx Recording Format file processing mechanisms within the WebEx Network Recording Player software. The flaw enables malicious actors to compromise user systems through social engineering tactics involving email attachments or web links containing specially crafted malicious files. The vulnerability stems from inadequate input validation and memory handling within the player's file parsing routines, creating opportunities for attackers to inject and execute arbitrary code on targeted systems. Security researchers identified this issue through careful analysis of the player's handling of malformed ARF and WRF file structures, revealing that the software fails to properly sanitize user-supplied data before processing.
The technical exploitation of CVE-2017-12372 involves leveraging buffer overflow conditions and stack corruption vulnerabilities that occur when the WebEx player processes maliciously formatted recording files. When a user opens an infected file, the player's parsing logic encounters unexpected data patterns that cause memory corruption, potentially allowing attackers to overwrite critical program execution pointers or inject shellcode into the process memory space. This type of vulnerability falls under the CWE-121 category of stack-based buffer overflow conditions, which are commonly exploited in remote code execution scenarios. The ATT&CK framework categorizes this as a privilege escalation technique through malicious file execution, where initial access is gained through phishing campaigns targeting end users. The vulnerability affects multiple versions of the WebEx Network Recording Player, making it particularly dangerous as organizations often maintain legacy systems that may not receive timely security updates.
The operational impact of this vulnerability extends beyond simple system compromise, potentially enabling attackers to establish persistent access to corporate networks through lateral movement and credential theft. Once executed, the remote code execution allows attackers to perform actions such as installing additional malware, modifying system configurations, or exfiltrating sensitive data from compromised endpoints. The vulnerability's remote nature means that attackers can target users without requiring physical access to the systems, making it particularly dangerous in enterprise environments where users frequently open email attachments from unknown sources. Organizations may experience significant disruption to their communication infrastructure, with compromised systems potentially serving as entry points for broader network infiltration. The vulnerability also creates challenges for incident response teams, as the malicious behavior may be difficult to distinguish from legitimate system activity, and the exploitation often occurs without user awareness, complicating detection and forensic analysis.
Mitigation strategies for CVE-2017-12372 should encompass both immediate patch management and defensive operational measures. Cisco has released security updates addressing this vulnerability through multiple advisory releases, including CSCvf57234, CSCvg54868, and CSCvg54870, which contain the necessary code fixes for the buffer overflow conditions. Organizations should prioritize immediate deployment of these patches across all affected systems, particularly those running older versions of the WebEx Network Recording Player software. Network segmentation and email filtering solutions should be enhanced to prevent users from accessing potentially malicious recording files through email attachments or web links. Implementing application whitelisting policies can prevent unauthorized execution of the vulnerable player software, while user education programs should emphasize the dangers of opening unknown file attachments. Security monitoring should include detection of unusual file access patterns and process execution behaviors that may indicate exploitation attempts. Regular vulnerability assessments and penetration testing should be conducted to identify similar issues in other enterprise applications, while maintaining updated threat intelligence feeds to stay ahead of evolving exploitation techniques targeting similar vulnerabilities in communication software.