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
	trixie	2.28.8-1	vulnerable
	sid	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
mbedtls	source	(unstable)	(unfixed)	unimportant
polarssl	source	wheezy	(unfixed)	end-of-life
polarssl	source	(unstable)	(unfixed)	unimportant

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