CVE-2025-15319: Tanium Patch Privilege Escalation Flaw

CVE-2025-15319 Overview

CVE-2025-15319 is a local privilege escalation vulnerability affecting Tanium Patch Endpoint Tools. This security flaw allows a local attacker with low privileges to escalate their access to gain complete control over the affected system. The vulnerability is classified under CWE-59 (Improper Link Resolution Before File Access), commonly known as a symlink attack.

Critical Impact

A local attacker with limited privileges can exploit this vulnerability to gain elevated privileges, potentially achieving complete system compromise with full confidentiality, integrity, and availability impact.

Affected Products

• Tanium Patch Endpoint Tools (specific vulnerable versions detailed in vendor advisory)

Discovery Timeline

• February 9, 2026 - CVE-2025-15319 published to NVD
• February 10, 2026 - Last updated in NVD database

Technical Details for CVE-2025-15319

Vulnerability Analysis

This vulnerability exists due to improper link resolution before file access in Tanium Patch Endpoint Tools. When the software performs operations on files, it fails to properly validate whether the target path is a symbolic link (symlink) pointing to a different, potentially privileged location. This allows an attacker to craft malicious symbolic links that redirect file operations to sensitive system files or directories.

The local attack vector means an attacker must have existing access to the target system. Once authenticated, exploitation requires minimal complexity and no user interaction. Successful exploitation results in complete compromise of confidentiality, integrity, and availability on the affected system.

Root Cause

The root cause of CVE-2025-15319 is classified as CWE-59: Improper Link Resolution Before File Access (Link Following). This occurs when the Tanium Patch Endpoint Tools software follows symbolic links without properly verifying that the final destination is within an expected, safe directory structure. The application likely performs privileged file operations (such as writes, deletes, or permission changes) and an attacker can abuse this by creating symlinks that redirect these operations to arbitrary locations on the filesystem.

Attack Vector

The attack requires local access to the system where Tanium Patch Endpoint Tools is installed. An attacker with low-level privileges can exploit this vulnerability through the following general approach:

1. Identify a file operation performed by the privileged Tanium Patch Endpoint Tools process
2. Create a symbolic link in a location accessible to the attacker
3. Point the symlink to a sensitive system file or directory
4. Trigger the vulnerable operation, causing the privileged process to follow the symlink
5. The privileged operation is performed on the attacker-specified target, enabling privilege escalation

This symlink attack pattern is a well-documented technique for privilege escalation, particularly effective against software that performs file operations with elevated privileges but does not properly sanitize file paths.

Detection Methods for CVE-2025-15319

Indicators of Compromise

• Unexpected symbolic links created in directories where Tanium Patch Endpoint Tools operates
• Unusual file modifications to system files or privileged directories
• Evidence of privilege escalation in system logs following Tanium patch operations
• Unexpected changes to file permissions on sensitive system resources

Detection Strategies

• Monitor for symbolic link creation in Tanium working directories and temporary file locations
• Implement file integrity monitoring (FIM) on critical system files that could be targeted via symlink attacks
• Configure endpoint detection to alert on unusual privilege escalation patterns associated with Tanium processes
• Audit process execution chains for anomalous parent-child relationships involving Tanium components

Monitoring Recommendations

• Enable detailed logging for Tanium Patch Endpoint Tools operations
• Implement real-time monitoring for symlink creation events, particularly in temporary directories
• Deploy behavioral analysis to detect post-exploitation activities following successful privilege escalation
• Review Tanium service account activities for unexpected file system operations

How to Mitigate CVE-2025-15319

Immediate Actions Required

• Review the Tanium Security Advisory TAN-2025-021 for specific patch information and affected versions
• Apply the security update from Tanium as soon as available
• Audit systems for any signs of exploitation, particularly unexpected symlinks in Tanium operational directories
• Restrict local user access on systems with Tanium Patch Endpoint Tools until patched

Patch Information

Tanium has addressed this vulnerability in a security update. Administrators should consult the Tanium Security Advisory TAN-2025-021 for specific version information and download the appropriate patch for their environment. Apply the update according to your organization's change management procedures.

Workarounds

• Limit local user accounts on systems running Tanium Patch Endpoint Tools to trusted administrators only
• Implement strict file system permissions on directories where Tanium components operate
• Enable enhanced monitoring and alerting for symlink creation activities
• Consider temporarily disabling non-essential Tanium Patch Endpoint Tools functionality until the patch is applied

# Example: Monitor for symlink creation in common temporary directories
# Adjust paths based on your Tanium installation
find /tmp /var/tmp -type l -user root -ls 2>/dev/null
# Review Tanium service directories for unexpected symbolic links
ls -la /opt/Tanium/*/