CVE-2018-1000520

Name	CVE-2018-1000520
Description	ARM 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..
Source	CVE (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 Package	Release	Version	Status
mbedtls (PTS)	stretch (security), stretch (lts), stretch	2.4.2-1+deb9u4	vulnerable
	buster (security), buster, buster (lts)	2.16.9-0~deb10u1	vulnerable
	bullseye	2.16.9-0.1	vulnerable
	bookworm	2.28.3-1	vulnerable
	sid, trixie	3.6.2-3	vulnerable
polarssl (PTS)	jessie, jessie (lts)	1.3.9-2.1+deb8u4	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
mbedtls	source	(unstable)	(unfixed)	unimportant
polarssl	source	(unstable)	(unfixed)	unimportant

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