CVE-2024-2850
📋 TL;DR
This CVE describes a critical stack-based buffer overflow vulnerability in Tenda AC15 routers. Attackers can remotely exploit this by manipulating the 'urls' parameter in the saveParentControlInfo function, potentially allowing arbitrary code execution. Users of Tenda AC15 firmware version 15.03.05.18 are affected.
💻 Affected Systems
- Tenda AC15
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote attackers could achieve unauthenticated remote code execution, potentially taking full control of the router to intercept traffic, deploy malware, or pivot to internal networks.
Likely Case
Attackers exploit the vulnerability to crash the router (denial of service) or execute arbitrary code with router privileges, compromising network security.
If Mitigated
If routers are behind firewalls with strict inbound filtering and not internet-facing, the attack surface is significantly reduced, though internal threats remain.
🎯 Exploit Status
Public exploit details are available on GitHub, making exploitation straightforward for attackers. The vendor has not responded to disclosure attempts.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch is available. Monitor Tenda's website for firmware updates addressing CVE-2024-2850. If an update becomes available, download it from the official Tenda support portal and flash it to the router following vendor instructions.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the router's web interface by disabling remote management/WAN administration.
Log into router admin panel → Advanced Settings → System Tools → Remote Management → Disable
Network Segmentation
allPlace the router on a dedicated management VLAN with strict access controls to limit exposure.
🧯 If You Can't Patch
- Replace the vulnerable Tenda AC15 router with a different model or from a vendor that provides security updates.
- Implement strict network firewall rules to block all inbound traffic to the router's web interface (typically port 80/443) from untrusted networks.
🔍 How to Verify
Check if Vulnerable:
Check the router's firmware version via the web interface (typically under System Status or Advanced Settings). If it shows 15.03.05.18, it is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep version or check web interface manuallyVerify Fix Applied:
After applying any future firmware update, verify the version is no longer 15.03.05.18. Test by attempting to access /goform/saveParentControlInfo with monitoring for crashes (though this may be disruptive).📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/saveParentControlInfo with unusually long 'urls' parameters
- Router crash/reboot logs following web interface access
Network Indicators:
- Unusual inbound traffic to router IP on port 80/443 from external IPs
- Exploit pattern matches in web request payloads
SIEM Query:
source="router_logs" AND url="/goform/saveParentControlInfo" AND (urls_length>1000 OR status=500)🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC15/V15.03.05.18/saveParentControlInfo_urls.md
- https://vuldb.com/?ctiid.257774
- https://vuldb.com/?id.257774
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC15/V15.03.05.18/saveParentControlInfo_urls.md
- https://vuldb.com/?ctiid.257774
- https://vuldb.com/?id.257774
