Cryptographic issues in mbed TLS - CVE-2020-36422
Published: July 2, 2020 / Updated: January 11, 2023
Vulnerability identifier: #VU29447
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-36422
CWE-ID: CWE-310
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to perform a side-channel attack.
The vulnerability exists due to missing randomization in the mbedtls_ecp_check_pub_priv(), mbedtls_pk_parse_key(), mbedtls_pk_parse_keyfile(), mbedtls_ecp_mul(), and mbedtls_ecp_mul_restartable() functions in Mbed TLS. A local user can perform a side-channel attack on ECC key import and fully recover the private key after collecting a single trace of any of the affected functions.
Affected software
mbed TLS
How to mitigate CVE-2020-36422
Install updates from vendor's website.
mbed TLS - addressed in versions 2.7.16, 2.16.7, 2.23.0