Cryptographic issues in mbed TLS - CVE-2020-36421
Published: January 11, 2023
Vulnerability identifier: #VU71099
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-36421
CWE-ID: CWE-310
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform MitM attack.
The vulnerability exists due to a side channel in modular exponentiation. A remote attacker can disclose the RSA private key used in a secure enclave.
Affected software
mbed TLS
How to mitigate CVE-2020-36421
Install updates from vendor's website.
mbed TLS - addressed in versions 2.7.16, 2.16.7, 2.23.0
External References
- https://github.com/ARMmbed/mbedtls/issues/3394
- https://bugs.gentoo.org/730752
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.23.0
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.7
- https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
- https://github.com/Mbed-TLS/mbedtls/releases/tag/v2.7.16