CVE-2023-47636 in admin-ui-classic-bundle
Summary
by MITRE • 11/15/2023
The Pimcore Admin Classic Bundle provides a Backend UI for Pimcore. Full Path Disclosure (FPD) vulnerabilities enable the attacker to see the path to the webroot/file. e.g.: /home/omg/htdocs/file/. Certain vulnerabilities, such as using the load_file() (within a SQL Injection) query to view the page source, require the attacker to have the full path to the file they wish to view. In the case of pimcore, the fopen() function here doesn't have an error handle when the file doesn't exist on the server so the server response raises the full path "fopen(/var/www/html/var/tmp/export-{ uniqe id}.csv)". This issue has been patched in commit `10d178ef771` which has been included in release version 1.2.1. Users are advised to upgrade. There are no known workarounds for this vulnerability.
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Analysis
by VulDB Data Team • 12/10/2023
The vulnerability described in CVE-2023-47636 represents a critical Full Path Disclosure (FPD) flaw within the Pimcore Admin Classic Bundle, a backend user interface component for the Pimcore content management platform. This type of vulnerability falls under CWE-209, which specifically addresses the disclosure of system information through error messages that reveal sensitive file paths. The vulnerability manifests when the application's fopen() function fails to properly handle cases where requested files do not exist on the server, resulting in the exposure of complete server paths in error responses. This particular implementation allows attackers to obtain the absolute path to the webroot directory, specifically revealing paths such as "/var/www/html/var/tmp/export-{unique id}.csv" which can be exploited to gain valuable reconnaissance information about the target system's file structure.
The technical exploitation of this vulnerability occurs through the application's failure to implement proper error handling mechanisms when attempting to access non-existent files via the fopen() function. When a file operation fails due to the absence of a requested file, the system's default error reporting mechanism exposes the full server path to the user, creating a direct information disclosure channel. This is particularly concerning because the exposed paths can be leveraged by attackers to construct more sophisticated attacks, such as using SQL injection techniques with load_file() functions to read arbitrary files. The vulnerability is especially dangerous in environments where the web server operates with elevated privileges, as the disclosed paths may reveal sensitive directories and file structures that could be targeted for further exploitation.
The operational impact of CVE-2023-47636 extends beyond simple information disclosure, as it provides attackers with crucial reconnaissance data that can significantly aid in subsequent attack phases. The exposed file paths can be used to map the server's directory structure, identify potential attack vectors, and facilitate more advanced exploitation techniques. According to ATT&CK framework category T1083 (File and Directory Discovery), this vulnerability directly enables adversaries to gather information about the target system's file structure, which is a fundamental step in the reconnaissance phase of cyber attacks. The vulnerability affects the backend administrative interface, which typically has elevated privileges and access to sensitive system resources, making the potential impact even more severe. Organizations utilizing Pimcore Admin Classic Bundle are at risk of having their server infrastructure exposed to attackers who can use this information to plan more targeted attacks.
The vulnerability has been addressed through a specific code fix implemented in commit 10d178ef771, which was incorporated into release version 1.2.1 of the Pimcore Admin Classic Bundle. This patch demonstrates the importance of proper error handling in web applications, particularly when dealing with file operations that may fail due to missing resources. Security best practices dictate that applications should never expose internal system paths or file locations in error messages, as this information can be exploited by malicious actors. Organizations should prioritize upgrading to version 1.2.1 or later to remediate this vulnerability, as there are no recommended workarounds that can effectively mitigate the risk. The lack of workaround solutions underscores the fundamental nature of the flaw, which requires proper code-level fixes rather than configuration changes or temporary mitigation strategies. This vulnerability highlights the critical importance of implementing robust error handling practices in web applications and the necessity of following security guidelines that prevent information leakage through error responses.