CVE-2018-15417 in WebEx Network Recording Player
Summary
by MITRE
A vulnerability in the Cisco Webex Network Recording Player for Microsoft Windows and the Cisco Webex Player for Microsoft Windows could allow an attacker to execute arbitrary code on an affected system. The vulnerability exist because the affected software improperly validates Advanced Recording Format (ARF) and Webex Recording Format (WRF) files. An attacker could exploit this vulnerability by sending a user a malicious ARF or WRF file via a link or an email attachment and persuading the user to open the file by using the affected software. A successful exploit could allow the attacker to execute arbitrary code on the affected system.
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Analysis
by VulDB Data Team • 05/22/2023
The vulnerability identified as CVE-2018-15417 represents a critical code execution flaw in Cisco Webex Network Recording Player and Cisco Webex Player software for Microsoft Windows environments. This security weakness stems from inadequate input validation mechanisms within the affected software's handling of multimedia file formats, specifically Advanced Recording Format and Webex Recording Format files. The vulnerability classifies under CWE-121, which encompasses buffer overflow conditions, and aligns with ATT&CK technique T1203, known as "Exploitation for Client Execution," demonstrating how adversaries can leverage file-based attacks to gain unauthorized system access. The flaw exists in the software's parsing logic where it fails to properly validate file structures and content before processing, creating an opportunity for malicious actors to craft specially designed ARF or WRF files that trigger unexpected behavior.
The exploitation vector for this vulnerability is particularly concerning as it relies on social engineering techniques combined with file attachment delivery methods. Attackers can successfully compromise systems by distributing malicious files through email attachments or web links, leveraging the trust users place in legitimate software applications. When a user opens the crafted malicious file using the vulnerable Cisco Webex Player software, the improper validation allows arbitrary code execution within the context of the target system's privileges. This creates a persistent threat model where attackers can establish footholds, escalate privileges, and potentially move laterally within network environments. The vulnerability's impact extends beyond simple code execution as it can enable full system compromise and persistent access, making it particularly attractive to sophisticated threat actors.
The operational impact of CVE-2018-15417 is substantial across enterprise and organizational networks where Cisco Webex software is deployed. Organizations with extensive collaboration infrastructure using these recording players face significant risk exposure, as the vulnerability can be exploited through simple phishing campaigns that require minimal technical sophistication from attackers. The attack surface expands when considering that many users regularly open multimedia files from email communications, making this vector particularly effective for mass exploitation. Security teams must account for the potential for privilege escalation and lateral movement when analyzing incident response procedures, as the vulnerability can be leveraged to establish persistent backdoors or exfiltrate sensitive data. The vulnerability's persistence is enhanced by the fact that users often trust software applications, making social engineering components highly effective in successful exploitation attempts.
Mitigation strategies for CVE-2018-15417 should include immediate software patching from Cisco, which addresses the input validation flaws in the affected players. Organizations must implement comprehensive email filtering and attachment scanning solutions to prevent malicious files from reaching users, while also establishing user awareness training programs to reduce successful social engineering attempts. Network segmentation and privilege separation can limit the potential impact of successful exploitation by containing the attack within specific network zones. Security monitoring should focus on detecting unusual file access patterns and code execution activities, particularly when users open multimedia files from untrusted sources. The implementation of application whitelisting policies can prevent unauthorized software from executing on systems, while regular vulnerability assessments should identify similar input validation issues in other multimedia processing applications. Organizations should also consider implementing endpoint detection and response solutions to identify and respond to exploitation attempts in real-time, ensuring that the vulnerability does not result in successful compromise of their systems.