free5GC UDR is the user data repository (UDR) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.1, the NEF component reliably leaks internal parsing error details (e.g., invalid character 'n' after top-level value) to remote clients, which can aid attackers in service fingerprinting. All deployments of free5GC using the Nnef_PfdManagement service may be affected. free5gc/udr pull request 56 contains a patch for the issue.
There is no direct workaround at the application level. The recommendation is to apply the provided patch.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/free5gc/free5gc/issues/753
security-advisories@github.com
https://github.com/free5gc/free5gc/security/advisories/GHSA-6468-f87j-6g82
security-advisories@github.com
https://github.com/free5gc/udr/commit/754d23b03755ad59077ed529ce3b971e477080c4
security-advisories@github.com
https://github.com/free5gc/udr/pull/56
security-advisories@github.com