CVE-2025-0914: Velociraptor Auth Bypass Vulnerability

CVE-2025-0914 Overview

An improper access control vulnerability has been identified in the VQL (Velociraptor Query Language) shell feature of Velociraptor, an open-source endpoint visibility and collection tool. This security flaw allowed authenticated users to execute the execve() plugin even in deployments where administrators had explicitly forbidden this functionality by configuring the prevent_execve flag in the configuration file.

Critical Impact

Authenticated users can bypass security restrictions to execute arbitrary system commands via the execve() plugin, potentially compromising endpoint security controls in hardened Velociraptor deployments.

Affected Products

• Velociraptor versions prior to 0.73.4
• Deployments with prevent_execve flag configured in the configuration file
• VQL shell environments with restricted execution policies

Discovery Timeline

• 2025-02-27 - CVE-2025-0914 published to NVD
• 2025-02-27 - Last updated in NVD database

Technical Details for CVE-2025-0914

Vulnerability Analysis

This vulnerability is classified as CWE-281 (Improper Preservation of Permissions), indicating that the access control mechanism fails to properly enforce the security restriction defined by the prevent_execve configuration setting. The issue affects the VQL shell feature, which is a powerful query interface used by security analysts to investigate endpoints.

The prevent_execve flag is a security-hardening configuration option designed to prevent the execution of arbitrary system commands through the VQL interface. When properly enforced, this setting blocks the execve() plugin from being invoked, limiting the potential impact of compromised user accounts. However, due to improper access control validation, authenticated users could circumvent this restriction.

It's important to note that this setting is uncommonly used and not typically recommended for standard deployments, which limits the scope of affected installations. Organizations that have implemented this security control as part of a defense-in-depth strategy are the primary targets affected by this vulnerability.

Root Cause

The root cause of this vulnerability lies in the improper enforcement of the prevent_execve configuration flag within the VQL shell's access control logic. The permission check that should have prevented execution of the execve() plugin was either not properly implemented or could be bypassed through the VQL shell interface.

The access control mechanism failed to consistently validate the prevent_execve setting across all code paths that lead to the execution of system commands. This allowed authenticated users to invoke the restricted functionality despite the explicit configuration prohibiting it.

Attack Vector

The attack requires network access and authentication to the Velociraptor server with VQL shell privileges. An attacker with valid credentials could craft VQL queries that invoke the execve() plugin, bypassing the access control restriction. The attack scenario involves:

1. An attacker gains or possesses valid authentication credentials to the Velociraptor deployment
2. The attacker accesses the VQL shell interface
3. Despite the prevent_execve flag being set, the attacker successfully executes VQL queries utilizing the execve() plugin
4. Arbitrary system commands are executed on the endpoint, potentially leading to further compromise

The vulnerability mechanism involves the access control bypass in the VQL shell's plugin execution path. When a VQL query attempts to use the execve() plugin, the system should check the prevent_execve configuration flag and deny execution if set. Due to improper validation, this check fails to properly restrict access, allowing authenticated users to execute arbitrary commands on managed endpoints. For complete technical details, see the Velociraptor Security Advisory CVE-2025-0914.

Detection Methods for CVE-2025-0914

Indicators of Compromise

• Unexpected VQL queries utilizing the execve() plugin in server logs
• Audit log entries showing command execution attempts that should have been blocked by the prevent_execve setting
• Anomalous process spawning on endpoints initiated through VQL queries

Detection Strategies

• Monitor VQL query logs for usage of the execve() plugin, particularly in environments with prevent_execve configured
• Implement alerting on any VQL shell activity that attempts to execute system commands
• Review Velociraptor server audit logs for access control violation patterns
• Compare expected behavior based on prevent_execve configuration against actual execution logs

Monitoring Recommendations

• Enable verbose logging for VQL shell sessions to capture all query attempts
• Implement real-time alerting for execve() plugin usage in production environments
• Conduct regular audits of user accounts with VQL shell access privileges
• Monitor endpoint process creation events for processes spawned via Velociraptor agents

How to Mitigate CVE-2025-0914

Immediate Actions Required

• Upgrade Velociraptor to version 0.73.4 or later immediately
• Review VQL query logs for any suspicious execve() plugin usage prior to patching
• Audit user accounts with VQL shell access and verify appropriate privilege levels
• Implement network segmentation to limit access to Velociraptor management interfaces

Patch Information

The vulnerability is addressed in Velociraptor version 0.73.4. Organizations should update their deployments to this version or later to remediate the improper access control issue. The fix ensures proper enforcement of the prevent_execve configuration flag across all VQL shell execution paths.

For detailed patch information and upgrade instructions, refer to the Velociraptor Security Advisory CVE-2025-0914.

Workarounds

• Restrict VQL shell access to only essential personnel until the patch can be applied
• Implement additional network-level access controls to limit connectivity to the Velociraptor server
• Monitor and alert on all VQL shell activity in real-time as an interim detection measure
• Consider temporarily disabling VQL shell functionality if the risk is deemed unacceptable

# Configuration example - Verify prevent_execve setting in server configuration
# After upgrading to 0.73.4, confirm the setting is properly enforced
grep -r "prevent_execve" /etc/velociraptor/server.config.yaml

# Review VQL query audit logs for execve usage
grep -i "execve" /var/log/velociraptor/audit.log