CVE-2025-9579
📋 TL;DR
This CVE describes an OS command injection vulnerability in LB-LINK BL-X26 routers version 1.2.8. Attackers can remotely execute arbitrary commands on affected devices by manipulating the 'enable' parameter in the HTTP handler. This affects all users of the vulnerable router version.
💻 Affected Systems
- LB-LINK BL-X26 router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent backdoors, pivot to internal networks, or use the device for botnet activities.
Likely Case
Remote code execution leading to device takeover, credential theft, and network surveillance.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Proof of concept is publicly available on GitHub. Exploitation requires sending a crafted HTTP request to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Vendor has not responded to disclosure. Consider replacing affected devices or implementing workarounds.
🔧 Temporary Workarounds
Block HTTP access to vulnerable endpoint
linuxUse firewall rules to block access to /goform/set_hidessid_cfg endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "/goform/set_hidessid_cfg" --algo bm -j DROP
Disable remote administration
allTurn off remote management/administration features on the router
🧯 If You Can't Patch
- Isolate affected routers in a separate VLAN with strict network segmentation
- Implement network monitoring for suspicious HTTP requests to the vulnerable endpoint
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface or SSH. If version is 1.2.8, device is vulnerable.Check Version:
Check router web interface at http://[router-ip]/ or use nmap to identify device versionVerify Fix Applied:
Test by attempting to exploit the vulnerability with the public PoC. If command execution fails, the fix is working.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /goform/set_hidessid_cfg with unusual parameters
- Unusual command execution in system logs
Network Indicators:
- HTTP POST requests to /goform/set_hidessid_cfg containing shell metacharacters
- Outbound connections from router to suspicious IPs
SIEM Query:
source="router_logs" AND uri="/goform/set_hidessid_cfg" AND (param="enable" AND value CONTAINS "|" OR value CONTAINS ";" OR value CONTAINS "`")🔗 References
- https://github.com/lin-3-start/lin-cve/blob/main/B-Link%20X26%20V1.2.8-1/B-Link%20X26%20V1.2.8.md
- https://github.com/lin-3-start/lin-cve/blob/main/B-Link%20X26%20V1.2.8-1/B-Link%20X26%20V1.2.8.md#3-poc
- https://vuldb.com/?ctiid.321692
- https://vuldb.com/?id.321692
- https://vuldb.com/?submit.636082
- https://github.com/lin-3-start/lin-cve/blob/main/B-Link%20X26%20V1.2.8-1/B-Link%20X26%20V1.2.8.md
- https://github.com/lin-3-start/lin-cve/blob/main/B-Link%20X26%20V1.2.8-1/B-Link%20X26%20V1.2.8.md#3-poc
