CVE-2020-7966 in Enterprise Edition
Summary
by MITRE
GitLab EE 11.11 and later through 12.7.2 allows Directory Traversal.
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Analysis
by VulDB Data Team • 02/06/2020
GitLab Enterprise Edition versions 11.11 through 12.7.2 contain a critical directory traversal vulnerability that enables unauthorized access to arbitrary files on the server. This flaw resides in the file handling mechanisms within the application's codebase, allowing malicious actors to exploit path traversal techniques to access sensitive data outside the intended directory structure. The vulnerability manifests when the application fails to properly sanitize user-supplied input that is used in file operations, creating an opportunity for attackers to manipulate file paths and gain access to files they should not be able to read. This issue represents a classic directory traversal attack vector that has been documented in numerous security frameworks including CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory. The vulnerability affects the file serving functionality within GitLab's web interface, where user-provided parameters are directly used in file access operations without adequate validation or sanitization. The impact extends beyond simple file access as attackers can potentially retrieve configuration files, source code, database credentials, and other sensitive information stored on the server filesystem. This weakness is particularly dangerous in enterprise environments where GitLab serves as a central code repository and collaboration platform, as it could lead to complete system compromise and data breaches. The vulnerability is classified under the MITRE ATT&CK framework as part of the privilege escalation and credential access tactics, specifically leveraging path traversal techniques to bypass access controls. Attackers can exploit this vulnerability by crafting malicious URLs or API requests that include directory traversal sequences such as ../ or ..\, allowing them to navigate outside the intended file system boundaries. The affected versions span a significant release range, indicating this was a persistent flaw that required multiple patches to address properly. Organizations using these vulnerable versions face substantial risk as the exploitation requires minimal technical expertise and can be automated through various attack tools. The vulnerability demonstrates poor input validation practices and inadequate security controls around file system operations, which are fundamental security principles that should be enforced throughout application development. This type of vulnerability often leads to cascading security issues where initial unauthorized file access can escalate to full system compromise, especially when sensitive configuration files or database credentials are accessible through the traversal attack. The patching process for this vulnerability requires careful consideration as organizations must ensure all GitLab instances are updated to versions that properly address the path traversal issue. Security teams should implement monitoring for unusual file access patterns and unauthorized attempts to access system files, as these activities may indicate exploitation attempts. The vulnerability also highlights the importance of secure coding practices and regular security assessments to identify similar flaws in application code before they can be exploited by malicious actors. Organizations should also consider implementing web application firewalls and additional access controls to mitigate the risk of exploitation while awaiting patches for vulnerable systems. The impact of this vulnerability extends beyond immediate data exposure to include potential compliance violations and regulatory penalties, particularly in environments where strict data protection requirements apply. This flaw represents a fundamental security gap that requires comprehensive remediation including code review, patch deployment, and ongoing monitoring to ensure the vulnerability is fully addressed and cannot be exploited by threat actors.