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CVE-2018-0734

Publication date 30 October 2018

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

5.9 · Medium

Score breakdown

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).

Read the notes from the security team

Status

Package Ubuntu Release Status
openssl 21.04 hirsute
Fixed 1.1.1a-1ubuntu2
20.10 groovy
Fixed 1.1.1a-1ubuntu2
20.04 LTS focal
Fixed 1.1.1a-1ubuntu2
19.10 eoan
Fixed 1.1.1a-1ubuntu2
19.04 disco
Fixed 1.1.1a-1ubuntu2
18.10 cosmic
Fixed 1.1.1-1ubuntu2.1
18.04 LTS bionic
Fixed 1.1.0g-2ubuntu4.3
16.04 LTS xenial
Fixed 1.0.2g-1ubuntu4.14
14.04 LTS trusty
Fixed 1.0.1f-1ubuntu2.27
openssl098 21.04 hirsute Not in release
20.10 groovy Not in release
20.04 LTS focal Not in release
19.10 eoan Not in release
19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
openssl1.0 21.04 hirsute Not in release
20.10 groovy Not in release
20.04 LTS focal Not in release
19.10 eoan Not in release
19.04 disco Not in release
18.10 cosmic
Fixed 1.0.2n-1ubuntu6.1
18.04 LTS bionic
Fixed 1.0.2n-1ubuntu5.2
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release

Notes

mdeslaur

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

Severity score breakdown

Parameter Value
Base score 5.9 · Medium
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

References

Related Ubuntu Security Notices (USN)

    • USN-3840-1
    • OpenSSL vulnerabilities
    • 6 December 2018

Other references