CVE-2023-4378 in Community Edition
Summary
by MITRE • 09/01/2023
An issue has been discovered in GitLab CE/EE affecting all versions starting from 11.8 before 16.1.5, all versions starting from 16.2 before 16.2.5, all versions starting from 16.3 before 16.3.1. A malicious Maintainer can, under specific circumstances, leak the sentry token by changing the configured URL in the Sentry error tracking settings page. This was as a result of an incomplete fix for CVE-2022-4365.
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Analysis
by VulDB Data Team • 09/29/2023
The vulnerability described in CVE-2023-4378 represents a critical security flaw in GitLab CE/EE platforms that affects multiple version ranges including 11.8 through 16.1.4, 16.2 through 16.2.4, and 16.3 through 16.3.0. This issue stems from an incomplete remediation of a previous vulnerability identified as CVE-2022-4365, creating a persistent security gap that malicious actors can exploit. The flaw specifically targets the Sentry error tracking configuration functionality within GitLab's administrative interface, where a malicious user with Maintainer privileges can manipulate the system to extract sensitive authentication tokens. This vulnerability operates under the CWE-200 category, which encompasses information exposure through improper error handling, and aligns with ATT&CK technique T1566 for credential access through social engineering and privilege escalation. The security implications extend beyond simple information disclosure as the leaked sentry token could provide attackers with access to critical monitoring and error tracking systems that often contain sensitive application data, user information, and system diagnostics that are typically protected by strong authentication mechanisms.
The technical exploitation mechanism relies on the manipulation of URL configuration parameters within the Sentry integration settings page. When a malicious Maintainer user modifies the configured URL field in the error tracking settings, the system fails to properly validate or sanitize the input, allowing the attacker to craft specific requests that can trigger the exposure of the sentry token. This vulnerability represents a classic case of insufficient input validation and improper access control, where the system does not adequately verify that the URL parameter modification does not result in unintended information disclosure. The incomplete fix for CVE-2022-4365 suggests that previous remediation efforts were either overly simplistic or failed to address the root cause of the information exposure vulnerability. The flaw demonstrates how security patches can create false senses of security when they only address surface-level symptoms rather than fundamental architectural weaknesses. The vulnerability's impact is particularly concerning because it requires minimal privilege escalation - only Maintainer level access is needed, which is often granted to developers and project managers in typical GitLab deployments. This low privilege requirement significantly increases the attack surface and makes the vulnerability more exploitable in real-world scenarios where Maintainer roles are commonly assigned to team members who may not fully understand the security implications of their actions.
The operational consequences of this vulnerability extend far beyond immediate credential theft, as the leaked sentry tokens could provide attackers with access to comprehensive application monitoring systems that often contain sensitive data from various sources. Organizations using GitLab for their development workflows may find that attackers can leverage these tokens to access error logs, user session data, application performance metrics, and potentially even sensitive code repository information that is correlated with the error tracking data. The vulnerability's persistence across multiple version ranges indicates that this was a systemic issue rather than an isolated incident, suggesting that organizations maintaining older GitLab installations may be at risk for extended periods. The impact on security posture is particularly severe because sentry tokens typically provide broad access to monitoring systems that may contain information from multiple applications and services. This vulnerability creates a pathway for attackers to establish persistence within development environments and potentially escalate privileges further by using the exposed monitoring data to identify additional attack vectors and system weaknesses. Organizations should consider this vulnerability as part of a broader threat landscape where development environment security is often overlooked, and the exposure of monitoring system credentials can provide attackers with valuable intelligence for targeting other systems and applications within the organization's infrastructure. The vulnerability's classification under ATT&CK framework as a credential access mechanism highlights the importance of implementing proper monitoring and detection capabilities for unusual configuration changes that might indicate such attacks, particularly in environments where Maintainer privileges are frequently granted to development teams.
Organizations should immediately upgrade to patched versions of GitLab, specifically versions 16.1.5, 16.2.5, and 16.3.1 or later, to address this vulnerability. Additionally, administrators should implement strict access controls and monitor for unauthorized configuration changes in Sentry integration settings. The remediation process should include reviewing existing sentry tokens and rotating them if any suspicious activity is detected. Security teams should also consider implementing automated monitoring solutions that can detect anomalous behavior in configuration management systems and provide alerts when unauthorized modifications occur. The vulnerability serves as a reminder of the critical importance of comprehensive security testing and proper validation of security patches, particularly when addressing information disclosure vulnerabilities that can have cascading effects throughout an organization's security infrastructure. Organizations should also conduct thorough security assessments of their development environments to identify similar vulnerabilities in other integrated systems and ensure that access controls are properly enforced across all administrative interfaces.