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.
Weakness
The product does not validate, or incorrectly validates, a certificate.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Mbed_tls | Arm | * | 1.3.18 (including) |
| Mbed_tls | Arm | 2.0.0 (including) | 2.0.0 (including) |
| Mbed_tls | Arm | 2.1.0 (including) | 2.1.0 (including) |
| Mbed_tls | Arm | 2.1.1 (including) | 2.1.1 (including) |
| Mbed_tls | Arm | 2.1.2 (including) | 2.1.2 (including) |
| Mbed_tls | Arm | 2.1.3 (including) | 2.1.3 (including) |
| Mbed_tls | Arm | 2.1.4 (including) | 2.1.4 (including) |
| Mbed_tls | Arm | 2.1.5 (including) | 2.1.5 (including) |
| Mbed_tls | Arm | 2.1.6 (including) | 2.1.6 (including) |
| Mbed_tls | Arm | 2.4.0 (including) | 2.4.0 (including) |
| Mbedtls | Ubuntu | esm-apps/xenial | * |
| Mbedtls | Ubuntu | upstream | * |
| Mbedtls | Ubuntu | xenial | * |
| Mbedtls | Ubuntu | yakkety | * |
| Polarssl | Ubuntu | trusty | * |
Potential Mitigations
Related Attack Patterns
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
- 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