CVE-2025-5982: GitLab IP Restriction Bypass Vulnerability

CVE-2025-5982 Overview

An IP access restriction bypass vulnerability has been discovered in GitLab Enterprise Edition (EE) that affects a wide range of versions spanning from 12.0 to current releases. Under certain conditions, authenticated or unauthenticated users could circumvent IP-based access controls, potentially gaining unauthorized access to sensitive information within GitLab repositories and projects. This vulnerability poses a significant risk to organizations relying on IP allowlisting as a security control for their GitLab instances.

Critical Impact

Attackers can bypass IP access restrictions to view sensitive repository contents, project data, and potentially confidential information that should be protected by network-based access controls.

Affected Products

• GitLab Enterprise Edition versions 12.0 before 17.10.8
• GitLab Enterprise Edition versions 17.11 before 17.11.4
• GitLab Enterprise Edition versions 18.0 before 18.0.2

Discovery Timeline

• 2025-06-12 - CVE-2025-5982 published to NVD
• 2025-08-12 - Last updated in NVD database

Technical Details for CVE-2025-5982

Vulnerability Analysis

This vulnerability is classified under CWE-1220 (Insufficient Granularity of Access Control), indicating a fundamental weakness in how GitLab EE implements and enforces IP-based access restrictions. The flaw allows attackers to access protected resources from IP addresses that should be blocked according to the configured access policies.

GitLab EE provides IP access restriction features that allow administrators to limit access to specific IP ranges or CIDR blocks. This security control is commonly used to restrict access to internal networks, VPNs, or specific geographic locations. The vulnerability undermines this security mechanism, making IP-based restrictions ineffective under certain operational conditions.

The network-based attack vector with no authentication requirements means that external attackers can potentially exploit this vulnerability from any network location, defeating the purpose of IP allowlisting configurations.

Root Cause

The vulnerability stems from insufficient granularity of access control in GitLab EE's IP restriction validation logic. Certain request paths or conditions fail to properly validate the originating IP address against configured access restrictions, creating a bypass scenario. This represents a breakdown in the consistency of security checks across different application endpoints or request types.

Attack Vector

The attack is network-based and can be executed remotely without requiring any authentication or user interaction. An attacker needs to identify the specific conditions under which the IP validation is not properly enforced and craft requests that exploit this gap. Successful exploitation results in unauthorized access to confidential data that should be protected by IP-based access controls.

The vulnerability mechanism involves sending requests through specific endpoints or under particular conditions where the IP validation logic fails to execute properly. For detailed technical information, refer to the GitLab Issue Discussion.

Detection Methods for CVE-2025-5982

Indicators of Compromise

• Successful authentication or data access events originating from IP addresses outside configured allowlists
• Unusual access patterns to sensitive repositories from unexpected geographic locations
• Audit log entries showing access from blocked IP ranges that should have been denied
• Anomalous API request patterns that may indicate bypass attempts

Detection Strategies

• Review GitLab audit logs for access events from IP addresses not in configured allowlists
• Implement secondary network-level monitoring to correlate GitLab access with firewall logs
• Configure alerts for any successful access events from IP ranges outside organizational boundaries
• Deploy web application firewall (WAF) rules to monitor for unusual request patterns

Monitoring Recommendations

• Enable comprehensive audit logging in GitLab EE for all authentication and access events
• Implement network flow analysis to detect connections from unexpected source IPs
• Set up real-time alerting for access to high-sensitivity projects from unusual locations
• Regularly review and correlate GitLab access logs with expected IP access patterns

How to Mitigate CVE-2025-5982

Immediate Actions Required

• Upgrade GitLab EE to patched versions: 17.10.8, 17.11.4, or 18.0.2 or later
• Review recent audit logs for any evidence of exploitation or unauthorized access
• Implement additional network-layer access controls as defense in depth
• Assess what sensitive data may have been exposed if exploitation occurred
• Consider temporarily restricting external access until patches are applied

Patch Information

GitLab has released security patches addressing this vulnerability. Organizations should upgrade to the following fixed versions:

• GitLab EE 17.10.8 - For organizations on the 17.10.x branch
• GitLab EE 17.11.4 - For organizations on the 17.11.x branch
• GitLab EE 18.0.2 - For organizations on the 18.0.x branch

For additional details and patch verification, consult the GitLab Issue Discussion.

Workarounds

• Implement network-layer IP restrictions using firewalls or cloud security groups as a secondary control
• Deploy a reverse proxy or WAF with IP filtering capabilities in front of GitLab
• Enable additional authentication factors (MFA) to reduce impact of access control bypass
• Temporarily disable external network access to GitLab until patching is complete

# Example: Network-layer IP restriction using iptables as secondary control
# Restrict GitLab access to specific IP ranges at the firewall level
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 192.168.0.0/16 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP