CVE-2013-5534 in Unity Connection
Summary
by MITRE
Directory traversal vulnerability in the attachment service in the Voice Message Web Service (aka VMWS or Cisco Unity Web Service) in Cisco Unity Connection allows remote authenticated users to create files, and consequently execute arbitrary JSP code, via a crafted pathname for a file that is not a valid audio file, aka Bug ID CSCuj22948.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 03/01/2019
The vulnerability described in CVE-2013-5534 represents a critical directory traversal flaw within Cisco Unity Connection's Voice Message Web Service component, specifically affecting the attachment handling functionality. This issue resides in the VMWS or Cisco Unity Web Service module which processes voice message attachments, creating a pathway for malicious actors to manipulate file creation processes. The vulnerability stems from insufficient validation of file paths during attachment processing, allowing attackers to bypass normal file type restrictions and inject arbitrary content into the system.
The technical implementation of this flaw occurs when the system processes attachments that are not legitimate audio files, specifically targeting the pathname validation mechanisms within the web service. Attackers can craft malicious file paths that exploit the lack of proper input sanitization, enabling them to create files in arbitrary locations within the web application's directory structure. This directory traversal capability ultimately allows for the execution of arbitrary JSP code, as the system fails to properly validate or restrict the file creation operations to only legitimate audio file types. The vulnerability is classified under CWE-22 as a directory traversal condition, which represents a fundamental weakness in input validation that enables attackers to access files outside the intended directory scope.
The operational impact of this vulnerability is severe, as it provides remote authenticated users with the capability to execute arbitrary code on the affected system. This means that an attacker who has valid credentials to access the Cisco Unity Connection service can leverage this flaw to gain unauthorized control over the system, potentially leading to complete system compromise. The ability to execute JSP code opens the door to various malicious activities including data exfiltration, system reconnaissance, privilege escalation, and the establishment of persistent backdoors. The vulnerability affects organizations using Cisco Unity Connection versions prior to the patched releases, creating a significant risk for enterprises that rely on this voice messaging platform for business communications.
Organizations affected by this vulnerability should implement immediate mitigations including applying the relevant Cisco security patches and updates released to address the directory traversal issue. Network segmentation and access controls should be strengthened to limit access to the Voice Message Web Service to only authorized users and systems. Input validation mechanisms should be enhanced to properly sanitize all file paths and attachment names before processing, implementing strict file type checking and path validation routines. Additionally, monitoring and logging should be configured to detect suspicious file creation patterns and unusual attachment processing activities. The vulnerability aligns with ATT&CK technique T1059.007 for command and script interpreter and T1566 for credential harvesting, as it enables attackers to execute code and potentially escalate privileges through the compromised system. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other web services and applications within the organization's attack surface.