Executive Summary

CVE-2023-54335 is an authentication bypass vulnerability in eXtplorer version 2.1.14 and earlier. It allows attackers to log in to the admin panel without a password by manipulating the login POST request, specifically by submitting only the username field and omitting the password. After bypassing authentication, attackers can upload malicious PHP files to the server and execute remote commands, including opening a reverse shell, leading to full remote code execution on the vulnerable file management system. [1, 2]

Useful 0 Not Useful 0

Impact Analysis

This vulnerability can have severe impacts including unauthorized administrative access to the eXtplorer file management system, allowing attackers to upload and execute malicious PHP code remotely. This can lead to full compromise of the affected system, including data theft, data modification, service disruption, and potentially using the compromised server as a foothold for further attacks within the network. [1, 2]

Useful 0 Not Useful 0

Detection Guidance

This vulnerability can be detected by checking if the target eXtplorer instance is running version 2.1.14 or earlier. Detection involves sending POST requests to the login endpoint with only the username field (omitting the password) to test for authentication bypass. A proof-of-concept Python script exists that automates this detection by: 1) verifying the version from an XML file, 2) attempting login bypass with usernames from a wordlist, and 3) checking for successful authentication without a password. Specific commands would include using this Python script or crafting POST requests to the login URL with only the username parameter. Additionally, monitoring for unusual POST requests to the login endpoint or unexpected admin access without proper credentials can help detect exploitation attempts. [1]

Useful 0 Not Useful 0

Mitigation Strategies

Immediate mitigation steps include: 1) Restricting access to the eXtplorer admin panel by IP whitelisting or network segmentation to limit exposure. 2) Applying any available patches or updates from the vendor if released (none mentioned in the resources). 3) Temporarily disabling or removing the eXtplorer file manager if possible until a fix is applied. 4) Monitoring logs for suspicious login attempts or file uploads. 5) Implementing web application firewall (WAF) rules to block unauthorized POST requests to the login endpoint. Since the vulnerability allows authentication bypass and remote code execution, preventing access and monitoring for exploitation are critical immediate steps. [1, 2]

Useful 0 Not Useful 0

Compliance Impact

The vulnerability allows attackers to bypass authentication and gain unauthorized administrative access, enabling them to upload malicious PHP files and execute remote commands. This leads to a high impact on confidentiality, integrity, and availability of the system, which can result in unauthorized access to sensitive data. Such a compromise can negatively affect compliance with common standards and regulations like GDPR and HIPAA, which require protection of sensitive data and secure access controls. Therefore, exploitation of this vulnerability could lead to violations of these regulations due to unauthorized data access and potential data breaches. [2]

Useful 0 Not Useful 0