Source: cve@mitre.org
OpenBiblio 0.5.2-pre4 and earlier allows remote attackers to obtain sensitive information via a direct request for (1) shared/footer.php, (2) circ/mbr_fields.php, or (3) admin/custom_marc_form_fields.php, which reveals the path in various error messages.
OpenBiblio versions 0.5.2-pre4 and earlier are vulnerable to a path disclosure vulnerability, allowing attackers to glean sensitive information about the server's file system structure. This information can be leveraged to craft more sophisticated attacks, potentially leading to remote code execution or further compromise of the system.
Step 1: Target Identification: The attacker identifies a vulnerable OpenBiblio installation, likely by port scanning or web application fingerprinting.
Step 2: Requesting Vulnerable Files: The attacker sends HTTP GET requests to the vulnerable files: shared/footer.php, circ/mbr_fields.php, or admin/custom_marc_form_fields.php.
Step 3: Triggering Errors: The attacker may attempt to trigger errors by manipulating the request or exploiting known vulnerabilities in the targeted files (e.g., requesting a non-existent file included by one of the vulnerable files).
Step 4: Path Disclosure: The server responds with an error message that includes the full file path of the OpenBiblio installation. This reveals the server's internal file system structure.
Step 5: Information Gathering: The attacker analyzes the revealed path to identify potential sensitive files (e.g., configuration files, database credentials) and plan further attacks.
The vulnerability stems from insufficient error handling within OpenBiblio. Specifically, when requesting files like shared/footer.php, circ/mbr_fields.php, or admin/custom_marc_form_fields.php directly, the application fails to sanitize error messages. These error messages, triggered by various issues (e.g., missing includes, file access problems), reveal the full server-side file path. This path disclosure allows an attacker to understand the directory structure and potentially identify sensitive files or configuration details, aiding in subsequent attacks. The root cause is a lack of proper input validation and error message sanitization, leading to the leakage of internal system information.
While no specific APTs are directly linked to this CVE, the information gained from this vulnerability could be used by any attacker. This CVE is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog. However, the information gained from this vulnerability could be used to facilitate more complex attacks.
Web server logs: Look for requests to shared/footer.php, circ/mbr_fields.php, and admin/custom_marc_form_fields.php.
Web server logs: Analyze error messages for full file paths, indicating path disclosure.
Intrusion Detection Systems (IDS): Create signatures to detect requests to the vulnerable files and/or the presence of file paths in error messages.
File Integrity Monitoring (FIM): Monitor critical system files for unauthorized changes that might be facilitated by the path disclosure.
Upgrade to OpenBiblio version 0.5.2-pre5 or later.
Implement a Web Application Firewall (WAF) to filter malicious requests and block access to the vulnerable files.
Review and harden the web server configuration to prevent information leakage. This includes disabling directory listings and ensuring proper error handling.
Implement proper input validation and output encoding to prevent path disclosure and other vulnerabilities.
Regularly scan the system for vulnerabilities and apply security patches promptly.