CVE-2018-0734 Timing attack against DSA

What is CVE-2018-0734?

CVE-2018-0734 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 30 Oct 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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).

Weakness: CWE-327

Which versions are affected by CVE-2018-0734?

It affects 19 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Netapp Cloud Backup, Netapp Cn1610 Firmware, Netapp Oncommand Unified Manager, Netapp Santricity Smi-S Provider and 13 more.

How do I fix CVE-2018-0734?

Upgrade to a fixed version.

Is CVE-2018-0734 being exploited?

There is no known exploitation of CVE-2018-0734 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2018-0734, CLEANSTART-2026-AD31349, CLEANSTART-2026-IV73686, CLSA-2025-1760556795, CLSA-2025-1760559298, DEBIAN-CVE-2018-0734 and 2 more.