CVE-2025-26613: Wegia Wegia RCE Vulnerability

CVE-2025-26613 Overview

CVE-2025-26613 is a critical OS Command Injection vulnerability discovered in WeGIA, an open source Web Manager for Institutions with a focus on Portuguese language users. The vulnerability exists in the gerenciar_backup.php endpoint and could allow an unauthenticated attacker to execute arbitrary operating system commands remotely on the underlying server.

Critical Impact

This vulnerability enables remote code execution without authentication, potentially allowing complete server compromise, data exfiltration, and lateral movement within affected networks.

Affected Products

• WeGIA versions prior to 3.2.14
• All WeGIA installations utilizing the gerenciar_backup.php endpoint
• Portuguese language institutional web management deployments

Discovery Timeline

• 2025-02-18 - CVE-2025-26613 published to NVD
• 2025-02-28 - Last updated in NVD database

Technical Details for CVE-2025-26613

Vulnerability Analysis

This vulnerability is classified as CWE-78 (OS Command Injection), which occurs when an application constructs operating system commands using externally-influenced input without proper neutralization. In the case of WeGIA, the gerenciar_backup.php endpoint fails to adequately sanitize user-supplied input before passing it to system shell commands.

The backup management functionality inherently requires interaction with the underlying operating system to create, manage, or restore backup files. When user input is incorporated into these system commands without proper validation or escaping, attackers can inject additional shell commands that execute with the privileges of the web server process.

Root Cause

The root cause of CVE-2025-26613 is improper input validation in the gerenciar_backup.php file. The application accepts user-controlled parameters and incorporates them directly into shell command strings without sanitizing special characters such as semicolons (;), pipes (|), backticks (`), or other shell metacharacters. This allows attackers to break out of the intended command context and execute arbitrary commands.

Attack Vector

The vulnerability is exploitable over the network without requiring authentication or user interaction. An attacker can craft malicious HTTP requests to the gerenciar_backup.php endpoint containing shell metacharacters and arbitrary commands in vulnerable parameters.

The attack chain typically involves:

1. Identifying a WeGIA installation with the vulnerable endpoint accessible
2. Crafting a malicious request with command injection payloads in backup-related parameters
3. The application processes the request and executes the injected commands on the server
4. Attacker gains code execution with web server privileges, potentially leading to full system compromise

For technical details on the exploitation mechanism, refer to the GitHub Security Advisory GHSA-g3w6-m6w8-p6r2.

Detection Methods for CVE-2025-26613

Indicators of Compromise

• Unusual HTTP requests to gerenciar_backup.php containing shell metacharacters such as ;, |, &&, ||, or backticks
• Unexpected child processes spawned by the web server process (e.g., www-data or apache spawning shells)
• Anomalous outbound network connections from the web server to unknown external hosts
• Modified system files, new user accounts, or unauthorized SSH keys appearing on the server

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block command injection patterns in requests to gerenciar_backup.php
• Deploy endpoint detection and response (EDR) solutions to monitor for suspicious process execution chains originating from web server processes
• Enable comprehensive logging for all requests to backup management endpoints and review for anomalous patterns
• Utilize SentinelOne Singularity platform to detect behavioral indicators of post-exploitation activity

Monitoring Recommendations

• Monitor web server logs for requests containing encoded or obfuscated shell metacharacters targeting the gerenciar_backup.php endpoint
• Establish baseline behavior for the WeGIA application and alert on deviations such as unexpected system command execution
• Implement network monitoring to detect command-and-control communications that may follow successful exploitation
• Configure file integrity monitoring on critical system directories to detect unauthorized modifications

How to Mitigate CVE-2025-26613

Immediate Actions Required

• Upgrade WeGIA to version 3.2.14 or later immediately, as this version contains the fix for CVE-2025-26613
• If immediate upgrade is not possible, restrict access to gerenciar_backup.php at the web server or network level
• Audit web server logs for evidence of exploitation attempts against the vulnerable endpoint
• Review system integrity for signs of compromise if exploitation is suspected

Patch Information

The WeGIA development team has addressed this vulnerability in version 3.2.14. Organizations running affected versions should upgrade immediately. The security advisory and patch details are available at the GitHub Security Advisory.

Workarounds

• According to the vendor advisory, there are no known workarounds for this vulnerability; upgrading to version 3.2.14 is the only recommended remediation
• As a temporary measure, restrict network access to the gerenciar_backup.php endpoint using firewall rules or web server access controls
• Consider taking the backup management functionality offline until the patch can be applied
• Implement additional security controls such as WAF rules to filter command injection attempts

# Example: Apache configuration to restrict access to vulnerable endpoint
<Location /gerenciar_backup.php>
    Order deny,allow
    Deny from all
    Allow from 192.168.1.0/24
</Location>