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Q1What is this vulnerability? (Essence + Consequences)
🚨 **Essence**: Arbitrary File Upload in `clients/editclient.php`. 💥 **Consequences**: Remote Code Execution (RCE). Attackers upload executable files and access them to run malicious code on the server.
Q2Root Cause? (CWE/Flaw)
🛡️ **Root Cause**: Insecure File Upload Handling. The application fails to properly validate file extensions or content when processing client edits, allowing executable scripts to be stored and accessed.
Q3Who is affected? (Versions/Components)
📦 **Affected**: **PhpCollab v2.5.1 and earlier**. Specifically the file `clients/editclient.php`. It is a Web-based project collaboration tool.
🔥 **Public Exploits**: **Yes**. Multiple Exploit-DB entries (42934, 43519) exist. A Dockerized PoC is available on GitHub (`jlk/exploit-CVE-2017-6090`) for easy testing and demonstration.
Q7How to self-check? (Features/Scanning)
🔍 **Self-Check**: Scan for **PhpCollab v2.5.1**. Check if `clients/editclient.php` exists. Verify if the `logos_clients/` directory is web-accessible and allows execution of uploaded files.…
🩹 **Fix**: Update to a **patched version** of PhpCollab (if available). The vendor is listed as "n/a" in the data, so check official archives or community forks for security updates.…
🚧 **Workaround**: **Disable File Uploads** in the client edit section if possible. Restrict web access to the `logos_clients/` directory via `.htaccess` or web server config to prevent execution of uploaded scripts.…
🔴 **Urgency**: **High**. This is an RCE vulnerability with public exploits. If you are running an older version of PhpCollab, patch immediately or isolate the server. Do not ignore this risk.