mbedtls: local side channel attack on classical CBC decryption in (D)TLS (CVE-2020-16150)
A Lucky 13 timing side channel in mbedtls_ssl_decrypt_buf in library/ssl_msg.c in Trusted Firmware Mbed TLS through 2.23.0 allows an attacker to recover secret key information. This affects CBC mode because of a computed time difference based on a padding length.
Fixed In Version:
mbedtls 2.24.0, 2.16.8 or 2.7.17
References:
- https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-09-1
- https://nvd.nist.gov/vuln/detail/CVE-2020-16150
Affected branches:
- master
- 3.12-stable
- 3.11-stable
- 3.10-stable
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