#VU14538 Improper certificate validation in mbed TLS - CVE-2018-1000520
Published: August 27, 2018 / Updated: December 14, 2020
Vulnerability identifier: #VU14538
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2018-1000520
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
mbed TLS
mbed TLS
Software vendor:
ARM
ARM
Description
The vulnerability allows a remote attacker to bypass security restrictions on the target system.
The vulnerability exists in the mbedtls_ssl_get_verify_result() function of ARM mbed Transport Layer Security (TLS) due to improper validation of signed certificates. A remote attacker on a peer system can use a negotiated cipher suite of an Elliptic Curve Diffie-Hellman (ECDH) key exchange and Rivest-Shamir-Adleman (RSA) signed certificate (TLS-ECDH-RSA-*) to cause the targeted system to accept an arbitrary ECDSA signed certificate.
Remediation
Install update from vendor's website.