CVE-2024-4201 in GitLab
Summary
by MITRE • 06/13/2024
A cross-site scripting issue has been discovered in GitLab affecting all versions starting from 5.1 before 16.10.7, all versions starting from 16.11 before 16.111.4, all versions starting from 17.0 before 17.0.2. When viewing an XML file in a repository in raw mode, it can be made to render as HTML if viewed under specific circumstances.
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Analysis
by VulDB Data Team • 03/24/2025
This cross-site scripting vulnerability in GitLab represents a critical security flaw that enables malicious actors to execute arbitrary scripts within the context of a victim's browser when viewing XML files in raw mode. The vulnerability affects a wide range of GitLab versions including 5.1 through 16.10.6, 16.11 through 16.11.3, and 17.0 through 17.0.1, demonstrating the longevity and widespread impact of this particular flaw. The issue stems from improper sanitization of XML content when rendered in raw mode, creating an avenue for attackers to inject malicious HTML content that gets executed by the browser. This vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and represents a classic example of how XML processing can introduce security risks when not properly handled. The operational impact extends beyond simple script execution as it can enable session hijacking, data theft, and full browser compromise of authenticated users.
The technical exploitation of this vulnerability requires specific conditions to be met, including viewing XML files in raw mode within the GitLab repository interface. When an XML file contains malicious content that gets interpreted as HTML during rendering, attackers can leverage this to perform various malicious activities. The vulnerability's manifestation occurs in the rendering pipeline where XML content is not properly escaped or sanitized before being displayed to users, allowing HTML tags and scripts to be executed. This flaw particularly affects GitLab's repository browsing functionality and demonstrates how content rendering systems can become attack vectors when proper input validation is absent. The vulnerability's scope is significant because GitLab is widely used for code repositories, making it a prime target for attackers seeking to compromise developer environments.
From an operational security perspective, this vulnerability creates a persistent risk for organizations using GitLab as their primary code repository platform. The attack surface is broad as any user with access to a repository containing malicious XML files can potentially exploit this vulnerability, making it particularly dangerous in collaborative development environments. The vulnerability enables attackers to establish persistent access to user sessions, steal sensitive credentials, and access confidential code repositories. According to ATT&CK framework, this vulnerability maps to T1566, which covers social engineering techniques, as attackers can craft malicious XML files to trick users into executing malicious code. The potential for privilege escalation exists when attackers compromise user sessions, allowing them to access additional repositories and perform unauthorized actions within the GitLab environment.
Organizations should immediately implement mitigations including upgrading to patched versions of GitLab, specifically versions 16.10.7, 16.11.4, and 17.0.2 or later, which contain the necessary security fixes. Additional protective measures include implementing Content Security Policy headers to restrict script execution, enabling proper input validation for XML content, and conducting regular security assessments of repository contents. Administrators should also consider implementing automated scanning for potentially malicious XML files and establishing security awareness training for developers to recognize suspicious repository content. The vulnerability highlights the importance of proper content sanitization in web applications and demonstrates how seemingly innocuous features like raw file viewing can become security risks when not properly secured against malicious input. Regular security updates and patch management processes become critical in preventing exploitation of such vulnerabilities that can persist across multiple versions of software platforms.