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CVE-2019-1547

Published: 10 September 2019

Normally in OpenSSL EC groups always have a co-factor present and this is used in side channel resistant code paths. However, in some cases, it is possible to construct a group using explicit parameters (instead of using a named curve). In those cases it is possible that such a group does not have the cofactor present. This can occur even where all the parameters match a known named curve. If such a curve is used then OpenSSL falls back to non-side channel resistant code paths which may result in full key recovery during an ECDSA signature operation. In order to be vulnerable an attacker would have to have the ability to time the creation of a large number of signatures where explicit parameters with no co-factor present are in use by an application using libcrypto. For the avoidance of doubt libssl is not vulnerable because explicit parameters are never used. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).

Notes

AuthorNote
mdeslaur
code isn't compiled into edk2
Priority

Low

CVSS 3 base score: 4.7

Status

Package Release Status
edk2
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not built)
disco Not vulnerable
(code not built)
eoan Not vulnerable
(code not built)
focal Not vulnerable
(code not built)
precise Does not exist

trusty Does not exist

upstream Needs triage

xenial Not vulnerable
(code not built)
nodejs
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(uses system openssl1.0)
disco Not vulnerable
(uses system openssl1.1)
eoan Not vulnerable
(uses system openssl1.1)
focal Not vulnerable
(uses system openssl1.1)
precise Does not exist

trusty Not vulnerable
(uses system openssl)
upstream Needs triage

xenial Not vulnerable
(uses system openssl)
openssl
Launchpad, Ubuntu, Debian
bionic
Released (1.1.1-1ubuntu2.1~18.04.6)
disco Ignored
(reached end-of-life)
eoan
Released (1.1.1c-1ubuntu4.1)
focal
Released (1.1.1d-2ubuntu1)
precise
Released (1.0.1-4ubuntu5.44)
trusty
Released (1.0.1f-1ubuntu2.27+esm1)
upstream
Released (1.1.1d)
xenial
Released (1.0.2g-1ubuntu4.16)
Patches:
upstream: https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=21c856b75d81eff61aa63b4f036bb64a85bf6d46 (1.0.2)
upstream: https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=7c1709c2da5414f5b6133d00a03fc8c5bf996c7a (1.1.0)
upstream: https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=30c22fa8b1d840036b8e203585738df62a03cec8 (1.1.1)
openssl1.0
Launchpad, Ubuntu, Debian
bionic
Released (1.0.2n-1ubuntu5.4)
disco Does not exist

eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist