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CVE-2018-1000520

Published: 26 June 2018

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..

Priority

Low

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
mbedtls
Launchpad, Ubuntu, Debian
xenial Needed

groovy Ignored
(end of life)
hirsute Ignored
(end of life)
jammy Needed

kinetic Ignored
(end of life, was needed)
artful Ignored
(end of life)
bionic Needed

cosmic Ignored
(end of life)
disco Ignored
(end of life)
eoan Ignored
(end of life)
focal Needed

impish Ignored
(end of life)
trusty Does not exist

upstream Needed

mantic Needed

lunar Ignored
(end of life, was needed)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N