CVE-2024-5195
📋 TL;DR
This critical vulnerability in Arris VAP2500 firmware allows remote attackers to execute arbitrary commands via command injection in the customer_info parameter of the /diag_s.php file. Attackers can exploit this to gain unauthorized access and control over affected devices. Organizations using Arris VAP2500 access points with vulnerable firmware versions are at risk.
💻 Affected Systems
- Arris VAP2500
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent backdoors, pivot to internal networks, intercept network traffic, or use the device as part of a botnet.
Likely Case
Unauthorized command execution leading to device takeover, credential harvesting, or network reconnaissance from the compromised access point.
If Mitigated
Limited impact if devices are properly segmented, have restricted administrative access, and are monitored for suspicious activity.
🎯 Exploit Status
Public exploit documentation exists, making exploitation straightforward for attackers with network access to vulnerable devices.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Check Arris/CommScope security advisories for firmware updates
2. If update available, download from official vendor site
3. Apply firmware update following vendor instructions
4. Verify update applied successfully
🔧 Temporary Workarounds
Block access to vulnerable endpoint
linuxUse firewall rules or web application filtering to block access to /diag_s.php
iptables -A INPUT -p tcp --dport 80 -m string --string "/diag_s.php" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/diag_s.php" --algo bm -j DROP
Disable web interface if not needed
allTurn off the web management interface if remote administration is not required
🧯 If You Can't Patch
- Segment affected devices on isolated network segments to limit lateral movement
- Implement strict network access controls to restrict who can reach the device management interfaces
🔍 How to Verify
Check if Vulnerable:
Check if the device responds to requests to /diag_s.php with customer_info parameter manipulation. Use curl: curl -X POST 'http://<device_ip>/diag_s.php' --data 'customer_info=test'Check Version:
Check web interface login page or device management interface for firmware version informationVerify Fix Applied:
Test if command injection is still possible after applying workarounds or patches. Attempt exploitation using known payloads.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /diag_s.php
- Commands containing shell metacharacters in customer_info parameter
- Multiple failed exploitation attempts
Network Indicators:
- Unexpected outbound connections from access points
- Traffic patterns suggesting command-and-control communication
- Port scanning originating from access points
SIEM Query:
source="web_logs" AND uri="/diag_s.php" AND (method="POST" OR params CONTAINS "customer_info")🔗 References
- https://github.com/h0e4a0r1t/h0e4a0r1t.github.io/blob/master/2024/a%2B%26%5BE4%3Flp5%3Fk9_%3D%5D/ARRIS_VAP2500-RCE-diag_s.php.pdf
- https://vuldb.com/?ctiid.265832
- https://vuldb.com/?id.265832
- https://vuldb.com/?submit.335253
- https://github.com/h0e4a0r1t/h0e4a0r1t.github.io/blob/master/2024/a%2B%26%5BE4%3Flp5%3Fk9_%3D%5D/ARRIS_VAP2500-RCE-diag_s.php.pdf
- https://vuldb.com/?ctiid.265832
- https://vuldb.com/?id.265832
- https://vuldb.com/?submit.335253
