CVE-2022-4462 in GitLab
Summary
by MITRE • 03/09/2023
An issue has been discovered in GitLab affecting all versions starting from 12.8 before 15.7.8, all versions starting from 15.8 before 15.8.4, all versions starting from 15.9 before 15.9.2. This vulnerability could allow a user to unmask the Discord Webhook URL through viewing the raw API response.
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Analysis
by VulDB Data Team • 04/02/2023
This vulnerability in GitLab represents a critical information disclosure flaw that emerged in versions starting from 12.8 through specific patch releases. The issue specifically affects the handling of Discord webhook configurations within the GitLab platform, where sensitive webhook URLs are inadvertently exposed through raw API responses. The vulnerability exists due to improper sanitization of webhook configuration data during API processing, allowing unauthorized users to access the complete webhook URL structure when requesting certain API endpoints. This represents a significant security risk as Discord webhook URLs typically contain authentication tokens or secrets that could enable malicious actors to intercept webhook notifications, potentially leading to unauthorized access to integrated services or data exfiltration.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding within GitLab's API response handling mechanisms. When users request specific API endpoints related to webhook configurations, the system fails to properly filter or mask sensitive components of the webhook URL. This flaw aligns with CWE-200, which addresses improper exposure of sensitive information, and specifically relates to CWE-1021, concerning improper restriction of excessive information exposure. The vulnerability operates at the application layer and can be exploited through standard API request methods, making it particularly dangerous as it requires minimal privileges to exploit. Attackers need only have access to the GitLab instance or the ability to make API requests to potentially discover these sensitive URLs.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates potential attack vectors for broader security compromises. Once an attacker obtains a Discord webhook URL, they could potentially manipulate webhook delivery, intercept notifications from GitLab projects, or use the exposed credentials to gain unauthorized access to integrated Discord services. This vulnerability particularly affects organizations that rely on GitLab for continuous integration and deployment workflows, where webhook integrations are common for automated notifications and deployment triggers. The exposure could enable attackers to monitor project changes, detect sensitive code commits, or even interfere with automated deployment processes, creating cascading security implications throughout the development pipeline.
Organizations should immediately implement mitigations including applying the latest security patches available for their GitLab installations, specifically versions 15.7.8, 15.8.4, and 15.9.2, which contain the necessary fixes. Additionally, administrators should review webhook configurations and ensure that sensitive information is not exposed through API endpoints. Network-level controls such as API rate limiting and monitoring for unusual API access patterns can provide additional defense-in-depth measures. The vulnerability demonstrates the importance of proper input sanitization and output encoding practices, particularly when handling sensitive data in API responses. Organizations should also consider implementing automated security scanning tools that can detect similar information disclosure vulnerabilities in their systems. This incident underscores the necessity of comprehensive security testing, including penetration testing and code reviews, to identify and remediate such flaws before they can be exploited by malicious actors. The ATT&CK framework categorizes this vulnerability under T1566, specifically targeting credential access through information disclosure, highlighting the need for robust access controls and data protection mechanisms in continuous integration environments.