CVE-2025-15313: Tanium EUSS Path Traversal Vulnerability

CVE-2025-15313 Overview

CVE-2025-15313 is an arbitrary file deletion vulnerability affecting Tanium EUSS (End-User Services Suite). This vulnerability, classified under CWE-59 (Improper Link Resolution Before File Access), allows a local attacker with low privileges to delete arbitrary files on the system through symlink manipulation. Successful exploitation could lead to data loss, system instability, or denial of service conditions by removing critical system or application files.

Critical Impact

Local attackers with low privileges can exploit improper symlink handling to delete arbitrary files, potentially causing data loss or service disruption.

Affected Products

• Tanium EUSS (End-User Services Suite)

Discovery Timeline

• 2026-02-10 - CVE-2025-15313 published to NVD
• 2026-02-10 - Last updated in NVD database

Technical Details for CVE-2025-15313

Vulnerability Analysis

This vulnerability stems from improper handling of symbolic links (symlinks) within the Tanium EUSS application. When the application performs file operations, it fails to properly validate whether a target path has been manipulated through symbolic link redirection. An attacker with local access and low-level privileges can exploit this weakness by creating a symbolic link that points to a sensitive file or directory they wish to delete.

The attack requires local access to the system where Tanium EUSS is installed. The attacker does not need any user interaction to execute the exploit. While the vulnerability does not allow for unauthorized data access or code execution, the integrity impact is significant as attackers can delete files that may be critical to system or application functionality.

Root Cause

The root cause of CVE-2025-15313 is CWE-59: Improper Link Resolution Before File Access, commonly known as a symlink attack vulnerability. The Tanium EUSS application performs file deletion operations without properly verifying that the target path is a legitimate file rather than a symbolic link pointing to an unintended location. This allows attackers to redirect file operations to arbitrary locations on the filesystem.

Attack Vector

The attack vector for this vulnerability is local, requiring the attacker to have authenticated access to the system with at least low-level privileges. The exploitation flow involves:

1. An attacker identifies a predictable file path that Tanium EUSS will attempt to delete during normal operations
2. The attacker creates a symbolic link at that location pointing to a target file they wish to delete
3. When Tanium EUSS performs its file deletion routine, it follows the symlink and deletes the target file instead
4. The attacker can leverage this to remove critical system files, application configurations, or security logs

This type of attack is particularly dangerous on systems where Tanium EUSS runs with elevated privileges, as the file deletion operation may succeed against files the attacker would not normally have permission to modify.

Detection Methods for CVE-2025-15313

Indicators of Compromise

• Unexpected creation of symbolic links in directories used by Tanium EUSS
• Unexplained deletion of system files, configuration files, or security logs
• File system audit logs showing deletion operations targeting files outside expected Tanium working directories
• Presence of user-created symlinks in privileged application directories

Detection Strategies

• Enable file system auditing to monitor symbolic link creation and file deletion events
• Implement file integrity monitoring (FIM) on critical system files and application configurations
• Monitor Tanium EUSS process activity for file operations that traverse symlinks
• Deploy SentinelOne Singularity to detect suspicious file system manipulation patterns associated with symlink attacks

Monitoring Recommendations

• Configure alerting for symbolic link creation in Tanium EUSS working directories
• Monitor for unexpected file deletions by privileged processes
• Review file system audit logs for anomalous patterns indicating symlink exploitation attempts
• Implement baseline monitoring for critical files that should not be deleted during normal operations

How to Mitigate CVE-2025-15313

Immediate Actions Required

• Review the Tanium Security Advisory TAN-2025-010 for the latest patch information
• Apply available security updates from Tanium immediately
• Restrict local access to systems running Tanium EUSS to trusted users only
• Enable enhanced file system auditing to detect potential exploitation attempts

Patch Information

Tanium has addressed this vulnerability in a security update. Organizations should consult the official Tanium Security Advisory TAN-2025-010 for specific version information and download the appropriate patch for their deployment. Given the local attack vector and requirement for authenticated access, prioritize patching based on exposure and criticality of affected systems.

Workarounds

• Limit local user access on systems running Tanium EUSS to reduce the attack surface
• Implement strict file system permissions on directories used by Tanium EUSS
• Deploy application whitelisting to prevent unauthorized modification of Tanium-related directories
• Monitor and alert on symbolic link creation in sensitive directories as a detective control until patching is complete