Vulnerability Details : 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).
Products affected by CVE-2020-36477
- cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-36477
0.09%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 36 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-36477
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:N |
8.6
|
2.9
|
NIST | |
|
5.9
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
2.2
|
3.6
|
NIST |
CWE ids for CVE-2020-36477
-
The product does not validate, or incorrectly validates, a certificate.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-36477
-
https://security.gentoo.org/glsa/202301-08
Mbed TLS: Multiple Vulnerabilities (GLSA 202301-08) — Gentoo securityThird Party Advisory
-
https://github.com/ARMmbed/mbedtls/releases/tag/v2.24.0
Release Mbed TLS 2.24.0 · ARMmbed/mbedtls · GitHubRelease Notes;Third Party Advisory
-
https://github.com/ARMmbed/mbedtls/issues/3498
Erroneous handling of IP address SANs · Issue #3498 · ARMmbed/mbedtls · GitHubThird Party Advisory
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