CVE-2025-0194: GitLab Information Disclosure Vulnerability

CVE-2025-0194 Overview

An information disclosure vulnerability has been discovered in GitLab CE/EE that could result in sensitive access tokens being written to log files. This vulnerability affects multiple versions of GitLab starting from version 17.4, where under certain conditions, access tokens may have been logged when API requests were made in a specific manner. This type of sensitive data exposure poses significant risks as log files are often stored without adequate protection and may be accessible to unauthorized parties.

Critical Impact

Access tokens exposed in logs could allow attackers with log access to impersonate users, access repositories, and perform unauthorized actions against GitLab resources.

Affected Products

• GitLab Community Edition (CE) versions 17.4 to 17.5.4
• GitLab Enterprise Edition (EE) versions 17.6 to 17.6.2
• GitLab CE/EE versions 17.7 prior to 17.7.1

Discovery Timeline

• 2025-01-08 - CVE CVE-2025-0194 published to NVD
• 2025-01-08 - GitLab releases security patch (versions 17.5.5, 17.6.3, and 17.7.1)
• 2025-07-11 - Last updated in NVD database

Technical Details for CVE-2025-0194

Vulnerability Analysis

This vulnerability falls under the category of Information Exposure, specifically classified as CWE-538 (Insertion of Sensitive Information into Externally-Accessible File or Directory). The issue occurs within GitLab's API request handling mechanism, where access tokens are inadvertently written to log files under certain conditions when API requests are made in a specific manner.

The vulnerability requires network access and high privileges to exploit, though it does not require user interaction. A successful exploitation could result in exposure of access tokens that would compromise both the confidentiality and integrity of affected GitLab instances. Organizations that maintain extensive logging or store logs in centralized logging systems may be particularly vulnerable, as access tokens could persist in these systems even after the GitLab instance has been patched.

Root Cause

The root cause stems from improper filtering of sensitive authentication data during the API request logging process. When specific types of API requests are processed, the logging mechanism fails to properly sanitize or redact access token information before writing to log files. This results in plaintext credentials being stored in externally-accessible locations.

Attack Vector

The attack vector is network-based, requiring an attacker to first gain access to the log files where tokens are exposed. This could occur through:

1. Compromising systems with access to GitLab logs
2. Exploiting misconfigured log shipping or aggregation services
3. Gaining unauthorized access to backup systems containing log archives
4. Social engineering attacks targeting personnel with log access

Once an attacker obtains exposed access tokens from logs, they can authenticate as the token owner and perform actions within GitLab according to the token's permissions, including accessing private repositories, modifying code, and potentially escalating privileges within the GitLab environment.

The vulnerability manifests in the API request handling and logging subsystem. When certain API requests are processed, access tokens are not properly redacted before being written to log files. For detailed technical information, see the GitLab Patch Release Announcement.

Detection Methods for CVE-2025-0194

Indicators of Compromise

• Presence of access tokens or authentication credentials in GitLab application logs
• Unexpected API activity from access tokens that may have been exposed
• Unusual authentication patterns or geographic anomalies for user accounts
• Evidence of log file access or exfiltration by unauthorized parties

Detection Strategies

• Implement log scanning to identify potential token exposure in historical logs using regex patterns for GitLab access token formats
• Monitor for suspicious API activity that could indicate compromised token usage
• Audit access to log files and logging infrastructure for unauthorized access attempts
• Review GitLab audit logs for unusual authentication or authorization events

Monitoring Recommendations

• Enable comprehensive audit logging in GitLab to track access token creation and usage
• Implement alerts for access token usage from new or unusual IP addresses
• Monitor log aggregation systems for potential exposure of sensitive data
• Configure SentinelOne Singularity Platform to detect anomalous access patterns on GitLab infrastructure

How to Mitigate CVE-2025-0194

Immediate Actions Required

• Upgrade GitLab CE/EE to patched versions: 17.5.5, 17.6.3, or 17.7.1 immediately
• Review and rotate any access tokens that may have been exposed in logs prior to patching
• Audit log files for presence of exposed credentials and securely purge affected logs
• Implement log access controls to restrict who can view GitLab application logs

Patch Information

GitLab has released patched versions that address this vulnerability. Organizations should upgrade to the following versions based on their current release branch:

• For 17.5.x branch: Upgrade to 17.5.5
• For 17.6.x branch: Upgrade to 17.6.3
• For 17.7.x branch: Upgrade to 17.7.1

For more information, see the GitLab Patch Release Announcement and the GitLab Issue #489459 Discussion.

Workarounds

• Restrict access to GitLab log files to only essential personnel until patching is complete
• Implement log rotation with secure deletion to limit the window of potential exposure
• Consider temporarily disabling or limiting API access if immediate patching is not possible
• Configure log shipping to exclude or filter potentially sensitive API request logs

# Configuration example
# Rotate and securely delete GitLab logs that may contain exposed tokens
# Navigate to GitLab log directory
cd /var/log/gitlab

# Identify potentially affected log files
grep -l "private_token\|personal_access_token" *.log

# After upgrading GitLab, rotate affected logs
gitlab-ctl logrotate

# Restrict log file permissions
chmod 600 /var/log/gitlab/*.log
chown root:root /var/log/gitlab/*.log