CVE-2025-57293
📋 TL;DR
A command injection vulnerability in COMFAST CF-XR11 routers allows attackers to execute arbitrary commands via a POST request to the multi_pppoe API. This can lead to full device compromise, unauthorized access to sensitive files, or execution of malicious code. Users of COMFAST CF-XR11 routers with firmware V2.7.2 are affected.
💻 Affected Systems
- COMFAST CF-XR11
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise leading to persistent backdoor installation, credential theft, network pivoting, and complete control over router functions.
Likely Case
Unauthorized command execution leading to network reconnaissance, data exfiltration, or device disruption.
If Mitigated
Limited impact if network segmentation, strict firewall rules, and proper access controls prevent exploitation attempts.
🎯 Exploit Status
Exploitation requires sending a crafted POST request to the vulnerable endpoint, which is straightforward for attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None known
Restart Required: No
Instructions:
No official patch is currently available. Monitor COMFAST vendor communications for firmware updates.
🔧 Temporary Workarounds
Block Vulnerable Endpoint
linuxUse firewall rules to block access to the vulnerable /cgi-bin/mbox-config endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "/cgi-bin/mbox-config" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/cgi-bin/mbox-config" --algo bm -j DROP
Disable Web Management Interface
linuxDisable the web management interface if not required for operations
uci set uhttpd.main.listen_http=''
uci set uhttpd.main.listen_https=''
uci commit uhttpd
/etc/init.d/uhttpd restart
🧯 If You Can't Patch
- Isolate affected devices in a separate network segment with strict firewall rules
- Implement network monitoring and intrusion detection for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if the device responds to POST requests at /cgi-bin/mbox-config?method=SET§ion=multi_pppoe with action=one_click_redialCheck Version:
cat /etc/version or check web interface firmware versionVerify Fix Applied:
Verify that command injection attempts no longer succeed and that the phy_interface parameter is properly sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/mbox-config with shell metacharacters in parameters
- System command execution from webmgnt process
Network Indicators:
- HTTP POST requests to /cgi-bin/mbox-config with suspicious parameter values
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND url="/cgi-bin/mbox-config" AND (method="POST" OR params CONTAINS "one_click_redial")