CVE-2021-22219 in Community Edition
Summary
by MITRE • 06/09/2021
GitLab CE/EE since version 9.5 allows a high privilege user to obtain sensitive information from log files because the sensitive information was not correctly registered for log masking.
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Analysis
by VulDB Data Team • 06/11/2021
GitLab CE/EE versions 9.5 and later contain a critical privilege escalation vulnerability that allows high-privilege users to access sensitive information from log files through improper log masking implementation. This vulnerability stems from inadequate configuration of sensitive data registration within the logging framework, enabling unauthorized access to confidential information that should have been masked or redacted. The flaw represents a significant security gap in the platform's information protection mechanisms, particularly affecting users with elevated privileges who can leverage this weakness to extract sensitive data from system logs.
The technical implementation of this vulnerability resides in the log masking subsystem where sensitive information such as passwords, API keys, tokens, and other confidential data elements are not properly identified and registered for masking operations. This misconfiguration allows log entries containing sensitive information to be written to log files without adequate obfuscation, creating potential exposure vectors for attackers who can access these log files through legitimate administrative access paths. The vulnerability specifically affects the logging infrastructure's ability to recognize and sanitize sensitive data patterns, which should be automatically masked according to established security protocols.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables high-privilege users to potentially access authentication credentials, encryption keys, and other sensitive system information that could be used for further exploitation. Attackers with access to administrative accounts can leverage this weakness to extract confidential data from log files, potentially gaining insights into system configurations, user activities, and security measures that should remain protected. This exposure creates opportunities for lateral movement within the system and could facilitate more sophisticated attacks targeting other components of the GitLab infrastructure.
Security professionals should implement immediate mitigations including verifying log masking configurations, ensuring all sensitive data patterns are properly registered for masking, and conducting thorough log file access controls reviews. Organizations should also establish monitoring procedures to detect unauthorized access to log files and implement automated scanning tools to identify sensitive information that may have been inadvertently exposed in log entries. The vulnerability aligns with CWE-532, which addresses information exposure through log files, and represents a significant concern for organizations following ATT&CK framework's credential access and defense evasion techniques. Regular security audits of logging configurations and comprehensive staff training on proper log management practices are essential to prevent exploitation of this and similar vulnerabilities.