Executive Summary

This vulnerability in UliCMS 2023.1 is an authentication bypass that allows unauthenticated attackers to create admin users by exploiting mass assignment in the UserController. Attackers can send a specially crafted POST request to the admin index.php endpoint with specific parameters to generate an administrative account with full system access.

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Impact Analysis

The vulnerability can allow attackers to gain full administrative access to the system without authentication. This means they can control the entire system, potentially leading to data breaches, unauthorized changes, and complete compromise of the affected UliCMS installation.

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Detection Guidance

This vulnerability can be detected by monitoring for suspicious HTTP POST requests to the admin index.php endpoint, specifically requests that include parameters such as 'admin=1' and 'group_id=1' which indicate attempts to create an administrative user via mass assignment. A practical detection method is to analyze web server logs for POST requests to '/dist/admin/index.php' containing these parameters. For example, using command-line tools like grep on access logs: grep -i 'POST /dist/admin/index.php' /path/to/access.log | grep -E 'admin=1|group_id=1'. Additionally, network intrusion detection systems (NIDS) can be configured to alert on such crafted POST requests targeting this endpoint. [2, 3]

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable admin endpoint to trusted IP addresses or networks, applying web application firewall (WAF) rules to block POST requests containing 'admin=1' and 'group_id=1' parameters, and disabling or limiting mass assignment functionality in the UserController if possible. Additionally, updating UliCMS to a patched version that addresses this authentication bypass vulnerability is critical once available. Until a patch is applied, monitoring and blocking suspicious requests as described can reduce risk. [2, 3]

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Compliance Impact

The provided resources do not contain information on how this vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.

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