free5GC AMF Service Crashed by Malicious 5G Network Request

Summary

The free5GC 5G core network software has a flaw that lets hackers crash the system by sending a fake network request. This can shut down the entire network. To fix this issue, update the free5GC AMF service to version 1.4.2 or later.

What to do

No fix is available yet. Check with your software vendor for updates.

Affected software

Vendor	Product	Affected versions	Fix available
free5gc	amf	<= 1.4.1	–

Original title

free5GC is an open-source project for 5th generation (5G) mobile core networks. Versions up to and including 1.4.1 of free5GC's AMF service have a Buffer Overflow vulnerability leading to Denial of...

Original description

free5GC is an open-source project for 5th generation (5G) mobile core networks. Versions up to and including 1.4.1 of free5GC's AMF service have a Buffer Overflow vulnerability leading to Denial of Service. Remote unauthenticated attackers can crash the AMF service by sending a specially crafted NAS Registration Request with a malformed 5GS Mobile Identity, causing complete denial of service for the 5G core network. All deployments of free5GC using the AMF component may be affected. Pull request 43 of the free5gc/nas repo contains a fix. No direct workaround is available at the application level. Applying the official patch is recommended.

nvd CVSS3.1 7.5

nvd CVSS4.0 6.6

Vulnerability type

CWE-129

https://github.com/free5gc/free5gc/issues/747 Exploit Issue Tracking Patch Vendor Advisory
https://github.com/free5gc/free5gc/security/advisories/GHSA-h6xc-8vvf-jcjp Patch Vendor Advisory
https://github.com/free5gc/nas/commit/0329a7ac3f314f210366c1b3c33dc29eded4ac5f Patch
https://github.com/free5gc/nas/pull/43 Issue Tracking Patch