SB2017042011 - Improper Certificate Validation in tls.mbed mbedtls

Description

This security bulletin contains information about 1 security vulnerability.

1) Improper Certificate Validation (CVE-ID: CVE-2017-2784)

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

An exploitable free of a stack pointer vulnerability exists in the x509 certificate parsing code of ARM mbed TLS before 1.3.19, 2.x before 2.1.7, and 2.4.x before 2.4.2. A specially crafted x509 certificate, when parsed by mbed TLS library, can cause an invalid free of a stack pointer leading to a potential remote code execution. In order to exploit this vulnerability, an attacker can act as either a client or a server on a network to deliver malicious x509 certificates to vulnerable applications.

Remediation

Install update from vendor's website.

References

• http://www.talosintelligence.com/reports/TALOS-2017-0274/
• https://security.gentoo.org/glsa/201706-18
• https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2017-01