CVE-2020-36478

NameCVE-2020-36478
DescriptionAn 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2826-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
mbedtls (PTS)stretch2.4.2-1+deb9u3vulnerable
stretch (security)2.4.2-1+deb9u4fixed
buster2.16.0-1vulnerable
bullseye2.16.9-0.1fixed
bookworm, sid2.16.11-0.3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
mbedtlssourcestretch2.4.2-1+deb9u4DLA-2826-1
mbedtlssource(unstable)2.16.9-0.1

Notes

https://github.com/ARMmbed/mbedtls/issues/3629
https://github.com/ARMmbed/mbedtls/commit/ca17ebfbc02b57e2bcb42efe64a5f2002c756ea8 (development)

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