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Fencer Intel
medium 5.9

CVE-2018-0737 json

Cache timing vulnerability in RSA Key Generation

published 2018-04-16 8 y ago modified 2026-10-15 25 d ago also EUVD-2018-1547

cvss
5.9
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
11.6%
EPSS 11.6% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

The OpenSSL RSA Key generation algorithm has been shown to be vulnerable to a cache timing side channel attack. An attacker with sufficient access to mount cache timing attacks during the RSA key generation process could recover the private key. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2b-1.0.2o).

Patch / fix

  • openssl Debian 14, Debian 13, Debian 12 1.1.0h-3

debian advisories DEBIAN-CVE-2018-0737

  • openssl Ubuntu 14.04 LTS 1.0.1f-1ubuntu2.26
  • openssl Ubuntu 16.04 LTS 1.0.2g-1ubuntu4.13
  • openssl Ubuntu 18.04 LTS 1.1.0g-2ubuntu4.1
  • openssl1.0 Ubuntu 18.04 LTS 1.0.2n-1ubuntu5.1

ubuntu advisories UBUNTU-CVE-2018-0737

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-2018:3221

  • openssl-1_1 SLE Module for Basesystem 15 1.1.0i-4.18.1
  • openssl SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +6 more 1.0.2j-60.39.1
  • openssl-1_0_0 SLE Module for Legacy 15 1.0.2p-3.8.1
  • compat-openssl098 SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for SAP 12 SP1 +2 more 0.9.8j-106.6.1
  • openssl1 SLES 11-SECURITY 1.0.1g-0.58.12.1
  • openssl Studio Onsite 1.3, SLES for SAP 11 SP4, SLES 11 SP4 +1 more 0.9.8j-0.106.15.1
  • openssl SLES 12-LTSS 1.0.1i-27.34.1
  • openssl SLES for SAP 12 SP1, SLES 12 SP1-LTSS 1.0.1i-54.20.1

suse advisories SUSE-SU-2019:1553-1SUSE-SU-2018:3864-2SUSE-SU-2019:0197-1SUSE-SU-2018:3864-1SUSE-SU-2018:2928-2SUSE-SU-2018:2965-1

  • openssl-1_0_0 openSUSE Tumbleweed 1.0.2u-6.2
  • openssl-1_1 openSUSE Tumbleweed 1.1.1l-1.2
  • openssl-1_1 openSUSE Leap 15.0 1.1.0i-lp150.3.18.1

opensuse advisories openSUSE-SU-2024:11126-1openSUSE-SU-2024:11127-1openSUSE-SU-2019:0152-1

  • openssl Alpine 3.7, Alpine 3.6, Alpine 3.5 +1 more 1.0.2o-r1
  • openssl Alpine 3.8, Alpine 3.4 1.0.2o-r2

alpine advisories ALPINE-CVE-2018-0737

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 1.1.0.i-1
  • lib32-openssl Arch Linux 1:1.1.0.i-1

arch linux advisories AVG-674AVG-675

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-2018-0737 updated cvss 3.3

openssl: RSA key generation cache timing vulnerability in crypto/rsa/rsa_gen.c allows attackers to recover private keys

  • Red Hat Enterprise Linux 5 openssl, openssl097a
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 6 openssl, openssl098e, openssl-perl
    affected: no fix available, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 7 openssl098e Red Hat JBoss Enterprise Application Platform 5 openssl Red Hat JBoss Enterprise Application Platform 6 openssl 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 Enterprise Linux Client (v. 7) openssl 1.0.2k-16.el7, openssl-libs 1.0.2k-16.el7 Red Hat Enterprise Linux Client Optional (v. 7) openssl-perl 1.0.2k-16.el7 Red Hat Enterprise Linux ComputeNode (v. 7) openssl 1.0.2k-16.el7, openssl-libs 1.0.2k-16.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) openssl-perl 1.0.2k-16.el7 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) openssl 1.0.2k-16.el7, openssl-libs 1.0.2k-16.el7 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) openssl-perl 1.0.2k-16.el7
    +4 more products
    Red Hat Enterprise Linux Server (v. 7) openssl 1.0.2k-16.el7, openssl-libs 1.0.2k-16.el7 Red Hat Enterprise Linux Server Optional (v. 7) openssl-perl 1.0.2k-16.el7 Red Hat Enterprise Linux Workstation (v. 7) openssl 1.0.2k-16.el7, openssl-libs 1.0.2k-16.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) openssl-perl 1.0.2k-16.el7
    fixed: vendor fix RHSA-2018:3221
  • 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
show 1 more
  • Red Hat Enterprise Linux 7 OVMF Red Hat Enterprise Linux 8 openssl, openssl-libs, openssl-perl
    not affected: vulnerable code not present

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 ICSA-19-155-01 updated cvss 5.9

PHOENIX CONTACT PLCNext AXC F 2152

  • Phoenix Contact AXC F 2152 2404267 version 1.x, 1046568 (Starterkit) version 1.x
    affected: vendor fix, mitigation “Phoenix Contact recommends affected users update to firmware release 2019.0 LTS or later, update to PLCNext Engineer release 2019.0 LTS or later, and apply the following specific mitigations below:” phoenixcontact.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
25 d ago

Exploit prediction

11.60% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 5.9 CVSS:3.0/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 Intel 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.