Improper verification of cryptographic signature in free5GC udm

1) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU95524

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-46324

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to pkg/suci/suci.go in free5GC udm may compute a shared secret via an uncompressed public key that has not been validated. A remote attacker can send arbitrary SUCIs to the UDM to gain unauthorized access to sensitive information on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

udm: 1.0.0 - 1.1.1

CPE2.3

• cpe:2.3:a:free5gc:udm:1.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:free5gc:udm:1.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:free5gc:udm:1.0.2:*:*:*:*:*:*:*

External links

https://github.com/free5gc/udm/pull/20
https://github.com/free5gc/udm/compare/v1.1.1...v1.2.0
https://www.gsma.com/security/wp-content/uploads/2023/10/0073-invalid_curve.pdf

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.