SB2023101022 - Buffer overflow in Mbed TLS

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2023-43615)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition. A remote attacker can send a malformed encrypted (or null-encrypted) record and perform a denial of service (DoS) attack.

2) Heap-based buffer overflow (CVE-ID: CVE-2023-45199)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in TLS handshake parsing with ECDH. A remote attacker can send specially crafted input to the application, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

A TLS 1.2 server configured with MBEDTLS_USE_PSA_CRYPTO and with support for a cipher suite using ECDH and a signature is vulnerable.

Remediation

Install update from vendor's website.

References

• https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2023-10-1/
• https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2023-10-2/