CVE-2019-9194 Scanner

The elFinder software is a web-based file management tool used by web developers and administrators for managing files and folders through a user-friendly interface. It is popular among CMS platforms and web applications globally, providing flexibility and ease of use. As an open-source solution, elFinder is implemented on various online platforms requiring efficient file handling solutions. Its capabilities extend to uploading, renaming, moving, deleting, and even editing files directly through the web interface. The tool is implemented primarily by those needing an integration-friendly and customizable file manager. It provides a backend integration through PHP, which makes it versatile but also a potential risk if not properly secured.

The Command Injection vulnerability detected in elFinder is due to insufficient sanitization of filenames when passed to the `exiftran` utility during image processing. This vulnerability exists in versions up to 2.1.47 and allows attackers to inject arbitrary commands. The flaw arises from improper handling of user-supplied input, leading to potential exploitation by malicious individuals with crafted payloads. As a critical security issue, it can lead to unauthorized command execution on the server where the vulnerable software is hosted. Systems running the affected versions are at risk unless adequately updated to a newer, secure version. The nature of this vulnerability allows for stealthy exploitation, severely impacting system integrity and confidentiality.

The technical aspect of the Command Injection vulnerability in elFinder revolves around unsanitized input reaching the `exiftran` command during processing of JPEG files. Attackers can exploit this by uploading specially crafted JPEG files that include a payload to execute arbitrary commands on the server. The endpoint used is the PHP file connector.minimal.php, which facilitates file operations. The vulnerability primarily affects the `cmd` parameter, where lack of input validation allows payload execution. Such issues stem from the absence of filters around inputs being processed through system-level utilities. Consequently, the vulnerability exposes critical server resources to remote command execution.

Exploitation of this vulnerability could lead to severe impacts such as unauthorized remote command execution, which opens the server to further infiltration by attackers. It might grant attackers excessive privileges or access to sensitive information if leveraged successfully. Moreover, system integrity may be compromised, and attacker-installed malware could persist undetected. The exploitation can lead to full server compromise, where unauthorized users can manipulate server configurations, deploy further attacks, and access confidential data. Organizations using vulnerable versions can face significant operational and reputational damage.

REFERENCES

• https://www.exploit-db.com/exploits/46481
• https://www.exploit-db.com/exploits/46539/
• https://nvd.nist.gov/vuln/detail/CVE-2019-9194
• https://github.com/cved-sources/cve-2019-9194
• https://github.com/Studio-42/elFinder/releases/tag/2.1.48