CVE-2023-49793 in CodeChecker
Summary
by MITRE • 06/24/2024
CodeChecker is an analyzer tooling, defect database and viewer extension for the Clang Static Analyzer and Clang Tidy. Zip files uploaded to the server endpoint of `CodeChecker store` are not properly sanitized. An attacker, using a path traversal attack, can load and display files on the machine of `CodeChecker server`. The vulnerable endpoint is `/Default/v6.53/CodeCheckerService@massStoreRun`. The path traversal vulnerability allows reading data on the machine of the `CodeChecker server`, with the same permission level as the `CodeChecker server`. The attack requires a user account on the `CodeChecker server`, with permission to store to a server, and view the stored report. This vulnerability has been patched in version 6.23.
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Analysis
by VulDB Data Team • 06/27/2024
The vulnerability identified as CVE-2023-49793 affects CodeChecker, a static analysis tool that integrates with Clang Static Analyzer and Clang Tidy for defect detection and reporting. This tool serves as both an analyzer and a database viewer extension, making it a critical component in software security workflows. The vulnerability resides in the massStoreRun endpoint of the CodeChecker server, specifically within the handling of zip file uploads through the /Default/v6.53/CodeCheckerService@massStoreRun interface. The flaw represents a classic path traversal vulnerability that undermines the security boundaries of the server environment, allowing unauthorized file access through crafted zip archives.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization of file paths within the zip extraction process. When users upload zip files to the CodeChecker server via the massStoreRun endpoint, the application fails to properly sanitize the file paths contained within these archives. This omission creates an exploitable condition where an attacker can craft malicious zip files containing path traversal sequences such as ../ or ..\ that bypass normal file system access controls. The vulnerability is particularly dangerous because it operates at the server level, meaning that any file accessible to the CodeChecker service account can be read and potentially displayed to authenticated users.
The operational impact of this vulnerability extends beyond simple data exposure, as it provides attackers with the ability to read arbitrary files on the server system with the same privileges as the CodeChecker service itself. This permission level typically corresponds to the system user under which the CodeChecker server operates, potentially exposing sensitive configuration files, database credentials, source code, or other system artifacts. The attack requires pre-existing authentication credentials with storage and viewing permissions, making it an authenticated vulnerability that can be exploited by insiders or compromised users. This access pattern aligns with attack techniques categorized under the MITRE ATT&CK framework as privilege escalation and credential access, specifically targeting the T1078 and T1566 techniques.
The vulnerability demonstrates a clear violation of the principle of least privilege and proper input validation as outlined in CWE-22, which addresses path traversal flaws in software systems. Security practitioners should note that this vulnerability affects the server-side file handling capabilities and represents a failure in the application's security design patterns. The fact that the vulnerability was patched in version 6.23 indicates that the maintainers recognized the severity of the issue and implemented proper path sanitization measures to prevent directory traversal attacks. Organizations using CodeChecker should immediately upgrade to version 6.23 or later and conduct thorough security reviews of their CodeChecker deployments, particularly examining file upload and extraction processes. Additionally, implementing network segmentation, access controls, and monitoring for unusual file access patterns can help detect potential exploitation attempts and reduce the overall risk surface. The vulnerability serves as a reminder of the critical importance of validating and sanitizing all user-provided inputs, especially when dealing with file system operations in web applications.