Certificate Revocation Flaw in Arm Mbed TLS
CVE-2020-36425

5.3MEDIUM

Key Information:

Vendor
Arm
Status
Mbed Tls
Vendor
CVE Published:
19 July 2021

Summary

A flaw in Arm Mbed TLS, prior to version 2.24.0, involves improper handling of certificate revocation checks, specifically with the revocationDate attribute. This vulnerability allows an attacker to exploit the system by altering the local clock, potentially undermining the trust established by certificate revocation lists (CRLs). As a consequence, the software may inadvertently accept expired or untrusted certificates, exposing applications to various security risks. Users are encouraged to upgrade to the latest versions to mitigate this issue.

References

https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.17
https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.8
https://github.com/ARMmbed/mbedtls/releases/tag/v2.24.0

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.