FreeBSD: VID-C685EDD9-C045-11EA-8898-001CC0382B2F: Mbed TLS -- Side-channel attack on ECC key import and validation
Description
Manuel Pégourié-Gonnard reports:
The scalar multiplication function in Mbed TLS accepts a random
number generator (RNG) as an optional argument and, if provided,
uses it to protect against some attacks.
It is the caller's responsibility to provide a RNG if protection
against side-channel attacks is desired; however two groups of
functions in Mbed TLS itself fail to pass a RNG:
mbedtls_pk_parse_key() and mbedtls_pk_parse_keyfile()
mbedtls_ecp_check_pub_priv() and mbedtls_pk_check_pair()
When those functions are called, scalar multiplication is computed
without randomisation, a number of old and new attacks apply,
allowing a powerful local attacker to fully recover the private
key.
Solution(s)
- freebsd-upgrade-package-mbedtls
- Lightweight Endpoint Agent
- Live Dashboards
- Real Risk Prioritization
- IT-Integrated Remediation Projects
- Cloud, Virtual, and Container Assessment
- Integrated Threat Feeds
- Easy-to-Use RESTful API
- Automation-Assisted Patching
- Automated Containment
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