CVE-2020-10250
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary operating system commands on BWA DiREX-Pro devices by injecting shell metacharacters into the PKG parameter of uninstall.php3. It affects BWA DiREX-Pro 1.2181 devices, potentially giving attackers full control over affected systems.
💻 Affected Systems
- BWA DiREX-Pro
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to install malware, steal data, pivot to other systems, or render devices inoperable.
Likely Case
Remote code execution leading to data theft, device takeover, or use as a foothold for further network attacks.
If Mitigated
Limited impact if proper network segmentation and access controls prevent exploitation attempts.
🎯 Exploit Status
Exploitation requires sending a crafted HTTP request to uninstall.php3 with shell metacharacters in the PKG parameter. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
No official patch available. Consider upgrading to newer device models or implementing workarounds.
🔧 Temporary Workarounds
Block access to uninstall.php3
allUse web server configuration or firewall rules to block access to the vulnerable endpoint
# Apache: RewriteRule ^uninstall\.php3$ - [F]
# Nginx: location = /uninstall.php3 { deny all; }
Network segmentation
linuxIsolate DiREX-Pro devices from internet and restrict internal access
# Firewall rule example: iptables -A INPUT -s <trusted_networks> -p tcp --dport 80 -j ACCEPT
# iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the device management interface
- Monitor for exploitation attempts and implement intrusion detection rules
🔍 How to Verify
Check if Vulnerable:
Check if device responds to requests to /uninstall.php3 with PKG parameter containing test payloadsCheck Version:
Check device web interface or documentation for firmware versionVerify Fix Applied:
Verify that access to uninstall.php3 is blocked or that command injection attempts fail📡 Detection & Monitoring
Log Indicators:
- HTTP requests to uninstall.php3 with unusual PKG parameter values
- Shell command execution in web server logs
Network Indicators:
- HTTP POST requests to /uninstall.php3 containing shell metacharacters like ;, |, &, $()
SIEM Query:
source="web_logs" AND uri="/uninstall.php3" AND (param="PKG" AND value MATCHES "[;&|`$()]+")