CVE-2018-18648 in Community Edition
Summary
by MITRE
An issue was discovered in GitLab Community and Enterprise Edition before 11.2.7, 11.3.x before 11.3.8, and 11.4.x before 11.4.3. It has Information Exposure Through an Error Message.
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Analysis
by VulDB Data Team • 06/13/2023
This vulnerability in GitLab represents a classic information disclosure flaw that occurs when the system inadvertently reveals sensitive internal details through error messages. The issue affects multiple versions of GitLab Community and Enterprise Edition, specifically those prior to 11.2.7, 11.3.8, and 11.4.3 respectively, indicating a widespread exposure across the product line. The vulnerability manifests when the application generates error responses that contain internal system information, potentially exposing configuration details, file paths, or other sensitive data that should remain hidden from end users. This type of exposure falls under the CWE-209 classification for information exposure through error message, which is categorized as a medium severity issue in the CWE taxonomy and aligns with the ATT&CK technique T1211 for exploiting information disclosure vulnerabilities.
The technical nature of this flaw stems from improper error handling within the GitLab application's response mechanisms. When certain operations fail or encounter invalid inputs, the system generates error messages that contain more information than necessary for legitimate troubleshooting purposes. These error responses may include stack traces, internal database query details, server configuration information, or other diagnostic data that could be leveraged by attackers to understand the underlying system architecture. The vulnerability is particularly concerning because GitLab serves as a critical infrastructure component for code management and collaboration, making any information exposure potentially valuable to threat actors seeking to plan more sophisticated attacks against the platform or the organizations using it.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates opportunities for attackers to gather intelligence about the target environment. An attacker who can trigger the vulnerable error conditions can collect data that might reveal the application's version, underlying technologies, database schema, or even internal network structures. This intelligence gathering capability significantly increases the risk profile of affected GitLab installations, as it provides attackers with valuable information that could be used in subsequent exploitation phases. The vulnerability's presence in multiple release branches suggests that it was likely introduced during a development cycle and not properly addressed through security review processes, highlighting gaps in the application's defensive programming practices.
Organizations using affected GitLab versions should prioritize immediate remediation through the recommended version upgrades to mitigate this exposure. The patch versions mentioned in the advisory specifically address the root cause by implementing proper error handling that sanitizes error messages before presentation to users. Additional mitigations include implementing web application firewalls that can filter error responses, configuring logging mechanisms to monitor for unusual error patterns, and conducting security reviews of error handling code paths. Organizations should also consider implementing network segmentation and access controls to limit the potential impact of information exposure, particularly in environments where GitLab serves as a central repository for sensitive code and development artifacts. This vulnerability demonstrates the importance of proper error handling practices and the potential consequences of insufficient input validation and output sanitization in enterprise software applications.