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Fencer Vulns
medium 5.9

CVE-2018-0734 json

Timing attack against DSA

published 2018-10-30 8 y ago modified 2026-10-08 31 d ago also EUVD-2018-1544

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
12.2%
EPSS 12.2% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

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).

Patch / fix

  • nodejs node.js 6.15.0, 8.14.0, 11.3.0
  • openssl Debian 14, Debian 13, Debian 12 1.1.1a-1

debian advisories DEBIAN-CVE-2018-0734

  • openssl Ubuntu 14.04 LTS 1.0.1f-1ubuntu2.27
  • openssl Ubuntu 16.04 LTS 1.0.2g-1ubuntu4.14
  • openssl Ubuntu 18.04 LTS 1.1.0g-2ubuntu4.3
  • openssl1.0 Ubuntu 18.04 LTS 1.0.2n-1ubuntu5.2

ubuntu advisories UBUNTU-CVE-2018-0734

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • jbcs-httpd24-apr jboss core services 1 1.6.3-63.jbcs.el6
  • jbcs-httpd24-curl jboss core services 1 7.64.1-14.jbcs.el6
  • jbcs-httpd24-httpd jboss core services 1 2.4.37-33.jbcs.el6
  • jbcs-httpd24-brotli jboss core services 1 1.0.6-7.jbcs.el6
  • jbcs-httpd24-mod_jk jboss core services 1 1.2.46-22.redhat_1.jbcs.el6
  • jbcs-httpd24-mod_md jboss core services 1 2.4.37-33.jbcs.el6
  • jbcs-httpd24-jansson jboss core services 1 2.11-20.jbcs.el6
  • jbcs-httpd24-libcurl jboss core services 1 7.64.1-14.jbcs.el6

red hat advisories RHSA-2019:3932RHSA-2019:3933RHSA-2019:3700RHSA-2019:2304

  • nodejs6 SLE Module for Web and Scripting 12, OpenStack Cloud Crowbar 8, OpenStack Cloud 7 +1 more 6.16.0-11.21.1
  • nodejs4 SLE Module for Web and Scripting 12, Enterprise Storage 4 4.9.1-15.17.1
  • openssl Studio Onsite 1.3, SLES for SAP 11 SP4, SLES 11 SP4 +4 more 0.9.8j-0.106.18.1
  • compat-openssl098 SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +4 more 0.9.8j-106.9.1
  • openssl-1_0_0 SLE Module for Legacy 15 1.0.2p-3.11.1
  • openssl-1_0_0 SLES for SAP 12 SP4, SLES 12 SP4, SLED 12 SP4 +1 more 1.0.2p-3.3.1
  • openssl1 SLES 11-SECURITY 1.0.1g-0.58.15.1
  • openssl-1_1 SLES for SAP 12 SP4, SLES 12 SP4, SLED 12 SP4 +1 more 1.1.1-2.3.1

suse advisories SUSE-SU-2019:1553-1SUSE-SU-2018:3864-2SUSE-SU-2019:0395-1SUSE-SU-2019:0117-1SUSE-SU-2018:4274-1SUSE-SU-2018:4068-1

  • openssl-1_0_0 openSUSE Tumbleweed 1.0.2u-6.2
  • openssl-1_1 openSUSE Tumbleweed 1.1.1l-1.2
  • virtualbox openSUSE Leap 15.1, openSUSE Leap 15.0 6.0.10-lp151.2.6.1
  • virtualbox openSUSE Leap 15.0 5.2.24-lp150.4.33.1

opensuse advisories openSUSE-SU-2024:11126-1openSUSE-SU-2024:11127-1openSUSE-SU-2019:1814-1openSUSE-SU-2019:1547-1

  • nodejs Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 10.14.0-r0
  • openssl Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 1.1.1a-r0
  • openssl Alpine 3.8, Alpine 3.7, Alpine 3.6 +3 more 1.0.2q-r0
  • openssl3 Alpine 3.16, Alpine 3.15 1.1.1a-r0
  • nodejs-current Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 11.3.0-r0
  • openssl1.1-compat Alpine 3.18, Alpine 3.17 1.1.1a-r0

alpine advisories ALPINE-CVE-2018-0734

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openssl Arch Linux 1.1.1.a-1
  • lib32-openssl Arch Linux 1:1.1.1.a-1

arch linux advisories AVG-792AVG-793

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-0734 updated cvss 5.1

openssl: timing side channel attack in the DSA signature algorithm

  • Red Hat Enterprise Linux 6 openssl, openssl098e, openssl-perl Red Hat Enterprise Linux 7 OVMF, openssl098e
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 8 mingw-openssl, mingw32-openssl, mingw64-openssl, compat-openssl10
    affected: no fix available, no fix planned “Will not fix”
  • Red Hat JBoss Enterprise Application Platform 6 openssl
    affected: no fix available “Fix deferred”
  • Red Hat JBoss Enterprise Web Server 2 openssl
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Web Server 3 openssl
    affected: no fix available
  • Red Hat Ansible Tower 3.4 for RHEL 7 Server ansible-tower-34/ansible-tower-memcached 1.4.15-28, ansible-tower-35/ansible-tower-memcached 1.4.15-28, ansible-tower-37/ansible-tower-memcached-rhel7 1.4.15-28
    fixed: vendor fix RHBA-2020:0547
  • Red Hat Enterprise Linux BaseOS (v. 8) openssl 1.1.1c-2.el8, openssl-libs 1.1.1c-2.el8, openssl-perl 1.1.1c-2.el8
    fixed: vendor fix RHSA-2019:3700
  • Red Hat Enterprise Linux Client (v. 7) openssl 1.0.2k-19.el7, openssl-libs 1.0.2k-19.el7 Red Hat Enterprise Linux Client Optional (v. 7) openssl-perl 1.0.2k-19.el7 Red Hat Enterprise Linux ComputeNode (v. 7) openssl 1.0.2k-19.el7, openssl-libs 1.0.2k-19.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) openssl-perl 1.0.2k-19.el7 Red Hat Enterprise Linux Server (v. 7) openssl 1.0.2k-19.el7, openssl-libs 1.0.2k-19.el7 Red Hat Enterprise Linux Server Optional (v. 7) openssl-perl 1.0.2k-19.el7
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) openssl 1.0.2k-19.el7, openssl-libs 1.0.2k-19.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) openssl-perl 1.0.2k-19.el7
    fixed: vendor fix RHSA-2019:2304
show 3 more
  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2019:3935
  • Red Hat JBoss Core Services on RHEL 6 Server jbcs-httpd24-apr 1.6.3-63.jbcs.el6, jbcs-httpd24-brotli 1.0.6-7.jbcs.el6, jbcs-httpd24-curl 7.64.1-14.jbcs.el6, jbcs-httpd24-httpd 2.4.37-33.jbcs.el6, jbcs-httpd24-jansson 2.11-20.jbcs.el6, jbcs-httpd24-mod_md 2.4.37-33.jbcs.el6, +25 more
    fixed: vendor fix RHSA-2019:3932
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-apr 1.6.3-63.jbcs.el7, jbcs-httpd24-brotli 1.0.6-7.jbcs.el7, jbcs-httpd24-curl 7.64.1-14.jbcs.el7, jbcs-httpd24-httpd 2.4.37-33.jbcs.el7, jbcs-httpd24-jansson 2.11-20.jbcs.el7, jbcs-httpd24-mod_md 2.4.37-33.jbcs.el7, +25 more
    fixed: vendor fix RHSA-2019:3933

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
31 d ago

Exploit prediction

12.15% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • OpenSSL OpenSSL

Classification

Weakness
  • CWE-327 Use of a Broken or Risky Cryptographic Algorithm
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.