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CVE-2018-0734

Published: 30 October 2018

The OpenSSL DSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.1a (Affected 1.1.1). Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.0.2q (Affected 1.0.2-1.0.2p).

Notes

AuthorNote
mdeslaur
there are other similar commits in crypto/dsa/dsa_ossl.c that
likely need backporting also.
upstream advisory was ammended with more commits

Priority

Low

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
openssl
Launchpad, Ubuntu, Debian
trusty
Released (1.0.1f-1ubuntu2.27)
hirsute
Released (1.1.1a-1ubuntu2)
bionic
Released (1.1.0g-2ubuntu4.3)
cosmic
Released (1.1.1-1ubuntu2.1)
disco
Released (1.1.1a-1ubuntu2)
eoan
Released (1.1.1a-1ubuntu2)
focal
Released (1.1.1a-1ubuntu2)
groovy
Released (1.1.1a-1ubuntu2)
upstream Needs triage

xenial
Released (1.0.2g-1ubuntu4.14)
Patches:
upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=43e6a58d4991a451daf4891ff05a48735df871ac (1.0.2)
upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=ebf65dbe1a67682d7e1f58db9c53ef737fb37f32 (1.0.2)
upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=880d1c76ed9916cddb97fe05fb4c144f0f6f1012 (1.0.2)
upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=f1b12b8713a739f27d74e6911580b2e70aea2fa4 (1.1.1)
upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=8abfe72e8c1de1b95f50aa0d9134803b4d00070f (1.1.1)
upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=6039651c43944cf4633483a74c2ef3a6b8c0c6c0 (1.1.1)
upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=84862c0979737b591acb689aef41ae2644176f32 (1.1.0)
upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=ef11e19d1365eea2b1851e6f540a0bf365d303e7 (1.1.0)
upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=26d7fce13d469f8d1a1b42131467ed4a65f8137b (1.1.0)
openssl098
Launchpad, Ubuntu, Debian
hirsute Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist
(trusty was needs-triage)
upstream Needs triage

xenial Does not exist

openssl1.0
Launchpad, Ubuntu, Debian
hirsute Does not exist

bionic
Released (1.0.2n-1ubuntu5.2)
cosmic
Released (1.0.2n-1ubuntu6.1)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N