CVE-2020-36478

high

Description

An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and before 2.7.18 LTS). A NULL algorithm parameters entry looks identical to an array of REAL (size zero) and thus the certificate is considered valid. However, if the parameters do not match in any way, then the certificate should be considered invalid.

References

https://cert-portal.siemens.com/productcert/pdf/ssa-756638.pdf

https://github.com/ARMmbed/mbedtls/issues/3629

https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9

https://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0

https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18

https://lists.debian.org/debian-lts-announce/2021/11/msg00021.html

https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html

Details

Source: Mitre, NVD

Published: 2021-08-23

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Severity: High