CVE-2022-3285 in GitLab
Summary
by MITRE • 11/10/2022
Bypass of healthcheck endpoint allow list affecting all versions from 12.0 prior to 15.2.5, 15.3 prior to 15.3.4, and 15.4 prior to 15.4.1 allows an unauthorized attacker to prevent access to GitLab
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Analysis
by VulDB Data Team • 12/11/2022
The vulnerability described in CVE-2022-3285 represents a critical security flaw in GitLab's healthcheck endpoint implementation that affects multiple versions across different release branches. This issue stems from an insufficient validation mechanism that allows unauthorized attackers to bypass the intended access controls for the healthcheck endpoint, potentially leading to complete service disruption. The vulnerability specifically impacts versions prior to 15.2.5, 15.3.4, and 15.4.1, indicating a widespread exposure across the GitLab platform's version history. The flaw exists within the access control list mechanism that governs who can access the healthcheck functionality, creating a pathway for malicious actors to exploit the system's monitoring capabilities for disruptive purposes.
The technical root cause of this vulnerability lies in the improper implementation of the healthcheck endpoint allow list functionality, which should restrict access to authorized personnel or systems only. When an attacker successfully bypasses this allow list, they gain the ability to manipulate or disrupt the healthcheck endpoint, which serves as a critical monitoring mechanism for system status and availability. This bypass allows unauthorized access to information that should remain protected, potentially exposing sensitive system metrics, status indicators, or operational data that could aid in further exploitation attempts. The vulnerability manifests as a lack of proper authentication or authorization checks when accessing the healthcheck endpoint, enabling attackers to perform actions that should be restricted to legitimate users or system components.
The operational impact of this vulnerability is severe and multifaceted, as it directly threatens the availability and integrity of GitLab services. An attacker who successfully exploits this vulnerability can prevent legitimate access to the healthcheck endpoint, potentially leading to service disruption or making it appear that the system is experiencing issues when it is actually being targeted. This type of attack can be particularly damaging in production environments where healthcheck data is used for automated monitoring, alerting, and incident response systems. The vulnerability creates a scenario where attackers can effectively disable or manipulate system monitoring capabilities, making it difficult for administrators to detect actual system issues or security incidents. From a cybersecurity perspective, this vulnerability aligns with CWE-284 Access Control Issues, specifically addressing improper access control mechanisms that allow unauthorized users to access restricted resources.
The potential attack vectors for this vulnerability are primarily focused on network-based exploitation where attackers can send malicious requests to the healthcheck endpoint without proper authorization. This type of attack can be classified under ATT&CK technique T1499.004 Endpoint Denial of Service, as it targets system availability through manipulation of monitoring endpoints. Attackers may leverage this vulnerability to cause false positive alerts, disrupt automated response systems, or create conditions that mask actual security incidents. The impact extends beyond simple service disruption to include potential information disclosure, as healthcheck endpoints often contain sensitive operational data that could be valuable to threat actors planning further attacks. Organizations using vulnerable GitLab versions face significant risk of operational disruption and potential compromise of their DevOps infrastructure.
Mitigation strategies for CVE-2022-3285 should focus on immediate version upgrades to the patched releases, specifically versions 15.2.5, 15.3.4, and 15.4.1, which contain the necessary security fixes. Network-level protections should be implemented through firewall rules and access control lists that restrict access to healthcheck endpoints to trusted IP addresses or network segments. Organizations should also implement additional monitoring to detect unusual access patterns to healthcheck endpoints, as this could indicate exploitation attempts. Configuration reviews should ensure that the allow list mechanisms are properly implemented and that no unnecessary access is granted to healthcheck functionality. The remediation process should include comprehensive testing to ensure that the patched version functions correctly and that no regression issues have been introduced. Additionally, organizations should review their overall access control policies and implement principle of least privilege for all system endpoints, including monitoring and healthcheck interfaces, to minimize the potential impact of similar vulnerabilities in the future.