CVE-2019-8385 in Desktop Extensions
Summary
by MITRE
An issue was discovered in Thomson Reuters Desktop Extensions 1.9.0.358. An unauthenticated directory traversal and local file inclusion vulnerability in the ThomsonReuters.Desktop.Service.exe and ThomsonReuters.Desktop.exe allows a remote attacker to list or enumerate sensitive contents of files via a \.. to port 6677. Additionally, this could allow for privilege escalation by dumping the affected machine's SAM and SYSTEM database files, as well as remote code execution.
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Analysis
by VulDB Data Team • 11/13/2025
The vulnerability identified as CVE-2019-8385 affects Thomson Reuters Desktop Extensions version 1.9.0.358, presenting a critical security flaw that combines directory traversal and local file inclusion capabilities. This issue resides within the ThomsonReuters.Desktop.Service.exe and ThomsonReuters.Desktop.exe components, creating a significant attack surface for remote adversaries. The vulnerability manifests through port 6677, which serves as the primary communication channel for the malicious exploitation. The flaw allows attackers to manipulate file paths using the \.. sequence, enabling them to navigate beyond the intended directory boundaries and access restricted system files. This directory traversal mechanism operates without requiring authentication, making the attack vector particularly dangerous as it can be exploited by anyone with network access to the affected system.
The technical implementation of this vulnerability stems from inadequate input validation and path sanitization within the desktop extension service. When processing user-supplied file paths, the application fails to properly validate or sanitize the input before using it in file system operations. This weakness creates an opportunity for attackers to construct malicious file paths that bypass normal access controls and directory restrictions. The vulnerability is classified under CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. The flaw enables attackers to enumerate system directories and access sensitive files that should normally be restricted, including system configuration files, credential stores, and other confidential data. The absence of authentication requirements means that this vulnerability can be exploited remotely without prior access credentials, significantly expanding the potential attack surface.
The operational impact of CVE-2019-8385 extends beyond simple file enumeration to include privilege escalation and remote code execution capabilities. Attackers can leverage this vulnerability to dump the machine's SAM (Security Accounts Manager) and SYSTEM database files, which contain critical Windows authentication information including password hashes and system-level credentials. This privilege escalation capability allows attackers to gain elevated system access, potentially enabling them to establish persistent access, move laterally within the network, or extract additional sensitive data. The vulnerability's remote code execution potential makes it particularly dangerous as it can be used to deploy malicious payloads, install backdoors, or compromise the entire system. This capability aligns with ATT&CK technique T1059, which covers command and scripting interpreter, and T1068, which addresses exploit for privilege escalation. The combination of these capabilities transforms a simple directory traversal vulnerability into a comprehensive attack vector that can compromise entire systems.
Mitigation strategies for CVE-2019-8385 require immediate action to address the root cause through proper input validation and path sanitization. Organizations should implement network segmentation to restrict access to port 6677, limiting exposure to authorized users only. The most effective remediation involves applying the vendor-provided security patches or updates that address the input validation flaws in the desktop extension service. System administrators should also implement monitoring and logging mechanisms to detect suspicious file access patterns and potential exploitation attempts. Network firewalls should be configured to block external access to the affected service ports, while internal access should be strictly controlled through proper authentication and authorization mechanisms. Additionally, regular security assessments should be conducted to identify and remediate similar vulnerabilities in other software components. The vulnerability demonstrates the importance of proper input validation in preventing directory traversal attacks and highlights the need for comprehensive security testing of all network-facing services. Organizations should also consider implementing application whitelisting policies to prevent unauthorized execution of potentially vulnerable software components.