CVE-2024-45159 Auth bypass in n/a
Attackers can bypass TLS client authentication checks in Mbed TLS 3.x when optional authentication is enabled, allowing unauthorized access using certificates not intended for TLS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-45159?
CVE-2024-45159 is a critical authentication bypass vulnerability in n/a, published on 5 Sep 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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).
Weakness: CWE-295
Which versions are affected by CVE-2024-45159?
It affects 1 product.
Products include Trustedfirmware Mbed Tls.
How do I fix CVE-2024-45159?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2024-45159 being exploited?
There is no known exploitation of CVE-2024-45159 in the wild and no public exploit code.
Other vulnerabilities in n/a
- CVE-2026-34875 Memory corruption in n/a
- CVE-2024-49195 Memory corruption in n/a
- CVE-2024-45158 Memory corruption in n/a
- CVE-2023-45199 Mbed TLS 3.2.x through 3.4.x before 3.5 has a Buffer Overflow that can lead to remote Code execution.
- CVE-2026-34873 An issue was discovered in Mbed TLS 3.5.0 through 4.0.0.
Sources
Also known as ALPINE-CVE-2024-45159, GHSA-cr54-4mf7-rg5v.