CVE-2022-1963 in Community Edition
Summary
by MITRE • 07/01/2022
An issue has been discovered in GitLab CE/EE affecting all versions starting from 13.4 before 14.10.5, all versions starting from 15.0 before 15.0.4, all versions starting from 15.1 before 15.1.1. GitLab reveals if a user has enabled two-factor authentication on their account in the HTML source, to unauthenticated users.
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Analysis
by VulDB Data Team • 07/18/2022
This vulnerability in GitLab CE/EE represents a critical information disclosure flaw that exposes sensitive authentication status information to unauthenticated users. The issue affects versions from 13.4 through 14.10.4 and specific ranges in 15.0 and 15.1 releases, creating a significant security risk for organizations relying on GitLab for source code management and collaboration. The vulnerability manifests as a side-channel information leak where the HTML source code reveals whether a user has enabled two-factor authentication, directly violating fundamental security principles of access control and authentication state obfuscation.
The technical implementation of this flaw occurs within GitLab's user interface rendering logic where authentication status indicators are exposed through HTML source code rather than being properly secured or obfuscated. This type of vulnerability aligns with CWE-200 - "Information Exposure" and represents a classic case of information leakage that provides attackers with valuable intelligence about user account security configurations. The flaw operates at the application layer, specifically within the web application's HTML response generation mechanism, where user authentication state information becomes inadvertently exposed to any user who can access the HTML source of pages containing user account information.
From an operational impact perspective, this vulnerability significantly weakens the security posture of GitLab installations by providing attackers with targeted intelligence about user account configurations. An attacker can systematically enumerate users within a GitLab instance and determine which accounts have two-factor authentication enabled, allowing for more sophisticated social engineering attacks or targeted credential stuffing attempts against accounts without MFA protection. The exposure of MFA status creates a privilege escalation vector that can be exploited to focus attack efforts on the most vulnerable accounts, potentially leading to unauthorized access to repositories, code modifications, and broader system compromise. This vulnerability directly impacts the principle of least privilege and can be categorized under ATT&CK technique T1566 - "Phishing" and T1589 - "Compromise Client Software Binary" as it provides attackers with information that can be used to craft more effective attacks.
Organizations should immediately implement mitigations including updating to the patched versions mentioned in the CVE, implementing proper access controls to prevent unauthorized HTML source inspection, and conducting comprehensive security assessments of their GitLab deployments. The recommended approach involves applying the vendor patches as soon as possible, implementing web application firewalls to detect and block unauthorized HTML source access patterns, and conducting regular security reviews of application outputs to ensure no sensitive information is exposed through response content. Additionally, organizations should consider implementing monitoring for unusual access patterns that might indicate attempts to enumerate user authentication status information, as this vulnerability can be systematically exploited through automated reconnaissance tools. The remediation process should also include security awareness training for administrators to understand the importance of proper information disclosure controls and the potential impact of side-channel vulnerabilities on overall security posture.