CVE Vulnerability

CVE-2020-36477

An issue was discovered in Mbed TLS before 2.24.0. The verification of X.509 certificates when matching the expected common name (the cn argument of mbedtls_x509_crt_verify) with the actual certificate name is mishandled: when the subjecAltName extension is present, the expected name is compared to any name in that extension regardless of its type. This means that an attacker could impersonate a 4-byte or 16-byte domain by getting a certificate for the corresponding IPv4 or IPv6 address (this would require the attacker to control that IP address, though).

4.3 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8.6 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

Scope

5.9 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/ARMmbed/mbedtls/releases/tag/v2.24.0 Release Notes Third Party Advisory
https://github.com/ARMmbed/mbedtls/issues/3498 Third Party Advisory
https://security.gentoo.org/glsa/202301-08 Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
Information

Published : 2021-08-23 02:15

Updated : 2023-01-13 07:59

NVD link : CVE-2020-36477

Mitre link : CVE-2020-36477

Products Affected
No products.
CWE
CWE-295

Improper Certificate Validation