CVE-2025-15316: Tanium Server Privilege Escalation Flaw

CVE-2025-15316 Overview

CVE-2025-15316 is a local privilege escalation vulnerability affecting Tanium Server. This security flaw allows an attacker with high-privilege local access to escalate their privileges through an argument injection weakness (CWE-88). The vulnerability enables complete compromise of confidentiality, integrity, and availability on affected systems.

Critical Impact

Local attackers with existing high-level privileges can leverage argument injection to escalate privileges, potentially gaining full system control over Tanium Server deployments.

Affected Products

• Tanium Server (specific versions detailed in security advisory)

Discovery Timeline

• 2026-02-09 - CVE CVE-2025-15316 published to NVD
• 2026-02-10 - Last updated in NVD database

Technical Details for CVE-2025-15316

Vulnerability Analysis

This vulnerability stems from improper neutralization of argument delimiters in a command (CWE-88), commonly known as argument injection. In Tanium Server, the flaw allows a local attacker who already possesses high-level privileges to manipulate command-line arguments passed to system processes. While the attack requires local access and elevated privileges to initiate, successful exploitation results in complete compromise of the affected system's confidentiality, integrity, and availability.

The local attack vector means remote exploitation is not directly possible; however, an attacker who has already gained a foothold on a system running Tanium Server could leverage this vulnerability to escalate their access to full system control.

Root Cause

The root cause of CVE-2025-15316 is improper handling of argument delimiters in command processing within Tanium Server. The application fails to properly sanitize or neutralize special characters and delimiters when constructing command-line arguments, allowing attackers to inject additional arguments that alter the intended behavior of system commands. This weakness enables privilege escalation when the injected arguments cause commands to execute with elevated permissions or bypass security controls.

Attack Vector

The attack requires local access to a system running the vulnerable Tanium Server software. An attacker with existing high-privilege access can craft malicious input containing argument delimiters that are improperly processed by the application. When the Tanium Server processes this input, the injected arguments are passed to underlying system commands, potentially allowing the attacker to:

1. Execute commands with elevated privileges beyond their current authorization level
2. Modify system configurations or security settings
3. Access sensitive data protected by privilege boundaries
4. Establish persistent elevated access on the compromised system

The vulnerability mechanism involves the application's failure to properly escape or validate arguments before passing them to command interpreters, allowing specially crafted delimiters to inject additional malicious arguments. For detailed technical information, refer to the Tanium Security Advisory TAN-2025-011.

Detection Methods for CVE-2025-15316

Indicators of Compromise

• Unusual command-line arguments in Tanium Server process logs containing unexpected delimiters or injected parameters
• Evidence of privilege escalation attempts originating from Tanium Server processes
• Unexpected changes to system configurations or security policies following Tanium Server activity
• Anomalous user privilege changes correlated with Tanium Server operations

Detection Strategies

• Monitor Tanium Server process execution for anomalous command-line arguments, particularly those containing special characters or unexpected parameter chains
• Implement audit logging for privilege escalation events and correlate with Tanium Server activity
• Deploy endpoint detection solutions to identify argument injection patterns in command execution
• Review system logs for unauthorized privilege changes occurring in the context of Tanium processes

Monitoring Recommendations

• Enable detailed logging for Tanium Server command execution and process spawning
• Configure SIEM rules to alert on privilege escalation events associated with Tanium Server processes
• Implement file integrity monitoring on critical Tanium Server configuration files
• Monitor for unexpected changes to user privileges or group memberships on systems running Tanium Server

How to Mitigate CVE-2025-15316

Immediate Actions Required

• Review the Tanium Security Advisory TAN-2025-011 for detailed remediation guidance
• Audit current Tanium Server deployments to identify vulnerable installations
• Restrict local access to Tanium Server systems to only essential administrative personnel
• Implement enhanced monitoring for privilege escalation attempts on affected systems
• Plan and schedule patching during the next available maintenance window

Patch Information

Tanium has addressed this vulnerability. Organizations should consult the Tanium Security Advisory TAN-2025-011 for specific patch information, affected version details, and download links for the security update. Apply the vendor-provided patch to all affected Tanium Server installations as the primary remediation measure.

Workarounds

• Limit local administrative access to Tanium Server systems to reduce the attack surface
• Implement application whitelisting to restrict which commands can be executed by Tanium Server processes
• Deploy additional monitoring controls to detect and alert on suspicious privilege escalation activity
• Segment Tanium Server infrastructure from general network access to limit attacker lateral movement opportunities

# Example: Restricting local access to Tanium Server (adjust paths as appropriate)
# Audit current local administrators on Tanium Server systems
net localgroup Administrators

# Review and restrict unnecessary administrative accounts
# Ensure only required service accounts and administrators have access