CVE-2022-2228 in Enterprise Edition
Summary
by MITRE • 07/01/2022
Information exposure in GitLab EE affecting all versions from 12.0 prior to 14.10.5, 15.0 prior to 15.0.4, and 15.1 prior to 15.1.1 allows an attacker with the appropriate access tokens to obtain CI variables in a group with using IP-based access restrictions even if the GitLab Runner is calling from outside the allowed IP range
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Analysis
by VulDB Data Team • 07/18/2022
This vulnerability represents a critical information exposure flaw in GitLab Enterprise Edition that undermines the security controls designed to restrict access to CI/CD variables through IP-based access restrictions. The flaw exists in versions prior to the specified patched releases, creating a significant bypass mechanism that allows unauthorized access to sensitive configuration data. The vulnerability specifically affects scenarios where GitLab Runners operate outside the explicitly allowed IP ranges while still maintaining access to group-level CI variables through legitimate access tokens.
The technical implementation of this flaw involves the improper validation of access controls within GitLab's CI/CD variable management system. When a GitLab Runner attempts to access group CI variables, the system should enforce IP-based restrictions as configured by administrators. However, the vulnerability allows attackers with valid access tokens to circumvent these restrictions regardless of the runner's IP address location. This represents a fundamental breakdown in the principle of least privilege and access control enforcement within the GitLab platform's security architecture.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable more sophisticated attack vectors. An attacker with appropriate access tokens could extract sensitive configuration parameters, credentials, or other confidential data that might be used for further exploitation within the CI/CD pipeline. The vulnerability affects multiple version streams simultaneously, indicating a systemic issue in how GitLab handles access control validation for CI/CD operations across different release branches. This creates a widespread risk that affects organizations using various GitLab EE configurations and deployment scenarios.
The security implications align with CWE-200 (Information Exposure) and represent a specific instance of inadequate access control enforcement. From an ATT&CK perspective, this vulnerability maps to T1552 (Credentials in Files) and T1078 (Valid Accounts) as it allows unauthorized access to CI/CD variables through legitimate authentication mechanisms. Organizations using GitLab with IP-based access restrictions for CI/CD operations face significant risk of credential exposure and pipeline compromise. The vulnerability demonstrates how seemingly isolated security controls can be bypassed through improper validation of access tokens and IP restrictions, creating a dangerous scenario where administrative intent to limit access is completely circumvented.
Mitigation strategies should focus on immediate patching of affected versions to the specified fixed releases, which address the core access control validation issue. Organizations should also implement additional monitoring for unauthorized access attempts to CI/CD variables and consider implementing more granular access controls beyond simple IP restrictions. Regular security assessments of CI/CD pipeline configurations and access control policies are essential to prevent similar vulnerabilities from emerging in other components of the GitLab platform. The vulnerability underscores the importance of comprehensive security testing for access control mechanisms, particularly in complex systems where multiple authentication and authorization layers interact.