An issue was discovered in Mbed TLS 3.x before 3.6.1. With TLS 1.3, when a server enables optional authentication of the client, if the client-provided certificate does not have appropriate values in if keyUsage or extKeyUsage extensions, then the return value of mbedtls_ssl_get_verify_result() would incorrectly have the MBEDTLS_X509_BADCERT_KEY_USAGE and MBEDTLS_X509_BADCERT_KEY_USAGE bits clear. As a result, an attacker that had a certificate valid for uses other than TLS client authentication would nonetheless be able to use it for TLS client authentication. Only TLS 1.3 servers were affected, and only with optional authentication (with required authentication, the handshake would be aborted with a fatal alert).
History

Thu, 19 Sep 2024 18:45:00 +0000

Type Values Removed Values Added
First Time appeared Arm
Arm mbed Tls
Weaknesses CWE-295
CPEs cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
Vendors & Products Arm
Arm mbed Tls
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Thu, 05 Sep 2024 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 05 Sep 2024 18:45:00 +0000

Type Values Removed Values Added
Description An issue was discovered in Mbed TLS 3.x before 3.6.1. With TLS 1.3, when a server enables optional authentication of the client, if the client-provided certificate does not have appropriate values in if keyUsage or extKeyUsage extensions, then the return value of mbedtls_ssl_get_verify_result() would incorrectly have the MBEDTLS_X509_BADCERT_KEY_USAGE and MBEDTLS_X509_BADCERT_KEY_USAGE bits clear. As a result, an attacker that had a certificate valid for uses other than TLS client authentication would nonetheless be able to use it for TLS client authentication. Only TLS 1.3 servers were affected, and only with optional authentication (with required authentication, the handshake would be aborted with a fatal alert).
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2024-09-05T00:00:00

Updated: 2024-09-05T20:29:16.858Z

Reserved: 2024-08-22T00:00:00

Link: CVE-2024-45159

cve-icon Vulnrichment

Updated: 2024-09-05T20:29:11.928Z

cve-icon NVD

Status : Analyzed

Published: 2024-09-05T19:15:13.150

Modified: 2024-09-19T18:26:24.687

Link: CVE-2024-45159

cve-icon Redhat

No data.