An issue has been discovered in GitLab CE/EE affecting all versions after 13.7 before 16.6.6, 16.7 prior to 16.7.4, and 16.8 prior to 16.8.1. This vulnerability allows arbitrary API PUT requests due to improper input sanitization of user names. Organizations using vulnerable versions of GitLab should prioritize addressing this issue to mitigate potential risks.
The CVSS 3.1 score for this vulnerability is 6.4, classified as medium severity, indicating that it poses a significant risk to organizations. The vulnerability can be exploited over the network, and while it requires low privileges, it does necessitate user interaction, which adds to its complexity.
Risk to organizations includes unauthorized modifications via API, which could lead to data integrity issues. As such, organizations should take immediate action to patch affected systems and prevent potential exploitation.
Organizations should prioritize patching immediately. The urgency of this vulnerability is underscored by its potential impact on system integrity and the need for secure application configurations.
Vulnerability Details
The vulnerability is classified as a result of improper input sanitization, specifically CWE-80 (Improper Neutralization of Input During Web Page Generation) and CWE-79 (Improper Neutralization of Input During Web Page Generation). This improper handling allows attackers to craft malicious API requests that the application may process without adequate validation.
The CVSS score of 6.4 reflects a medium severity rating, indicating the potential for significant impact if exploited. The vulnerability affects all versions of GitLab CE/EE after 13.7 before 16.6.6, 16.7 prior to 16.7.4, and 16.8 prior to 16.8.1, as detailed in the official advisory.
Technical Analysis
The root cause of this vulnerability is the improper sanitization of user input, specifically the username field. Attackers can exploit this weakness by sending specially crafted API requests that could lead to unauthorized data modifications.
The attack vector is network-based, requiring the attacker to have some form of user interaction to successfully carry out the attack. The attack complexity is classified as high due to the requirement for low privileges and user interaction.
The confidentiality and integrity impacts of this vulnerability are both high, as exploited systems may allow unauthorized users to alter critical data. However, it has no availability impact.
Risk & Impact Analysis
Organizations using GitLab should be particularly cautious due to the risk of unauthorized API requests leading to data integrity issues. The ability to manipulate data could have profound effects on operations, making it essential to address this vulnerability swiftly.
The potential blast radius is significant, as any unauthorized modifications could affect multiple users and data sets. Given the CVSS score and the nature of the vulnerability, organizations should assess their exposure and prioritize remediation efforts.
With an EPSS score of 0.038, the likelihood of exploitation is low; however, the consequences of an exploit could be severe. Therefore, organizations should balance urgency with thorough testing of patches and updates.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of GitLab CE/EE after 13.7 before 16.6.6, 16.7 prior to 16.7.4, and 16.8 prior to 16.8.1 are affected. Organizations should ensure they upgrade to the latest patched versions to mitigate this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching immediately. The recommended action is to upgrade to GitLab versions 16.6.6, 16.7.4, or 16.8.1 or newer. For those unable to apply patches immediately, implementing input validation on user names and restricting API access can serve as temporary mitigations.
Configuration hardening should also be considered to minimize exposure. Continuous monitoring of API usage for anomalies can help detect attempts to exploit this vulnerability.
For further guidance, organizations can refer to our penetration testing services.
Detection Guidance
Organizations should monitor logs for any unusual API PUT requests, especially those that manipulate user data. Behavioral anomalies in user account activities should be investigated promptly.
Network signatures associated with the API endpoints should be established to help detect malicious activities, and system changes should be closely monitored to identify unauthorized alterations.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its demonstration of how improper input handling can lead to severe security risks. As organizations increasingly rely on APIs, the need for rigorous input validation becomes paramount.
This incident represents a trend where attackers exploit input validation vulnerabilities to gain unauthorized access. Security teams should prioritize implementing comprehensive security testing in their development lifecycles.
For additional insights, organizations can consult our resources on penetration testing methodology and vulnerability management program design to strengthen their security posture.
Lastly, reviewing our insights on API penetration testing can provide additional layers of defense for organizations.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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