CVE-2018-0734: Timing attack against DSA
Vulnerability summary
CVE-2018-0734 is a medium (CVSS 5.9) vulnerability in canonical ubuntu_linux. EPSS estimates a 12.15% chance of exploitation in the next 30 days, higher than 96.1% of scored vulnerabilities.
Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 25 · Related 18Timeline
- 30-10-2018PublishedVulnerability first disclosed.
- 08-10-2026Last modifiedVulnerability information updated.
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).
CVSS metrics
6 scores · 4 sources · 3 versions- OSV · AlpineEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS trend
Probability
12.15%
Chance of exploitation in the next 30 days
Percentile
96%
Versus all other CVEs
30-day change
No change 0.00 pp
From 12.15% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Oracle8 products
- api_gateway11.1.2.4.0
- e-business_suite_technology_stack0.9.8 | 1.0.0 | 1.0.1
- enterprise_manager_base_platform12.1.0.5.0 | 13.2.0.0.0 | 13.3.0.0.0
- enterprise_manager_ops_center12.3.3
- mysql_enterprise_backup≥ 3.0, ≤ 3.12.3 | ≥ 4.0, ≤ 4.1.2
Alpine5 products
- nodejs< 10.14.0-r0
- nodejs-current< 11.3.0-r0
- openssl≥ 1.0.2, < 1.1.1a-r0 | ≥ 1.0.2, < 1.0.2q-r0
- openssl1.1-compat< 1.1.1a-r0
- openssl3< 1.1.1a-r0
Debian2 products
- openssl< 1.1.1a-1
- debian_linuxEOL9.0
Ubuntu2 products
- openssl< 1.0.1f-1ubuntu2.27 | < 1.0.2g-1ubuntu4.14 | < 1.1.0g-2ubuntu4.3
- openssl1.0< 1.0.2n-1ubuntu5.2
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04 | 18.10
Nodejs1 product
- node.jsEOL≥ 6.0.0, ≤ 6.8.1 | ≥ 6.9.0, < 6.15.0 | ≥ 8.0.0, ≤ 8.8.1 | ≥ 8.9.0, < 8.14.0 | ≥ 10.0.0, ≤ 10.12.0 | ≥ 11.0.0, < 11.3.0 | 10.13.0
Openssl1 product
- opensslEOLFixed 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) | ≥ 1.0.2, ≤ 1.0.2p | ≥ 1.1.0, ≤ 1.1.0i | 1.1.1
8 vendors · 26 products
References
35 links- www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.htmlX Refsource CONFIRMPatchThird Party Advisory
- nodejs.org/en/blog/vulnerability/november-2018-security-releases/X Refsource CONFIRMThird Party Advisory
Show all 35 references
- www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlX Refsource MISCPatchThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2019-06/msg00030.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.htmlX Refsource MISCPatchThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2019-07/msg00056.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
