Vulnerability · Published Aug 23, 2021 · Assigned by mitre
CVE-2020-36478
High 7.5
In plain English
A high-severity security flaw in the mbedtls package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)1.1%top 34.1% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mbedtls | 2.16.9-0.1 | DEBIAN-CVE-2020-36478 |
| Debian:13 | mbedtls | 2.16.9-0.1 | DEBIAN-CVE-2020-36478 |
| Debian:14 | mbedtls | 2.16.9-0.1 | DEBIAN-CVE-2020-36478 |
Affected products (as reported)
References
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18
- https://github.com/ARMmbed/mbedtls/issues/3629
- https://cert-portal.siemens.com/productcert/pdf/ssa-756638.pdf
- [debian-lts-announce] 20211123 [SECURITY] [DLA 2826-1] mbedtls security update mailing-list
- [debian-lts-announce] 20221225 [SECURITY] [DLA 3249-1] mbedtls security update mailing-list