CVE-2018-1000520

NameCVE-2018-1000520
DescriptionARM mbedTLS version 2.7.0 and earlier contains a Ciphersuite Allows Incorrectly Signed Certificates vulnerability in mbedtls_ssl_get_verify_result() that can result in ECDSA-signed certificates are accepted, when only RSA-signed ones should be.. This attack appear to be exploitable via Peers negotiate a TLS-ECDH-RSA-* ciphersuite. Any of the peers can then provide an ECDSA-signed certificate, when only an RSA-signed one should be accepted..
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
mbedtls (PTS)stretch (security), stretch (lts), stretch2.4.2-1+deb9u4vulnerable
buster2.16.0-1vulnerable
buster (security)2.16.9-0~deb10u1vulnerable
bullseye2.16.9-0.1vulnerable
bookworm2.28.3-1vulnerable
trixie2.28.7-1vulnerable
sid2.28.7-1.1vulnerable
polarssl (PTS)jessie, jessie (lts)1.3.9-2.1+deb8u4vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
mbedtlssource(unstable)(unfixed)unimportant
polarsslsourcewheezy(unfixed)end-of-life
polarsslsource(unstable)(unfixed)unimportant

Notes

https://github.com/ARMmbed/mbedtls/issues/1561
No security impact

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