CVE-2018-16395

high-risk
Published 2018-11-16

An issue was discovered in the OpenSSL library in Ruby before 2.3.8, 2.4.x before 2.4.5, 2.5.x before 2.5.2, and 2.6.x before 2.6.0-preview3. When two OpenSSL::X509::Name objects are compared using ==, depending on the ordering, non-equal objects may return true. When the first argument is one character longer than the second, or the second argument contains a character that is one less than a character in the same position of the first argument, the result of == will be true. This could be leveraged to create an illegitimate certificate that may be accepted as legitimate and then used in signing or encryption operations.

Do I need to act?

~
4.4% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
+
Fix available
Upgrade to: 08e12dd9302c1fd517c642bdd7d274e64b354c53
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (11)

Openssl

Affected Vendors

Debian Redhat Canonical Ruby-Lang

References (38)

Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html
Third Party Advisory http://www.securitytracker.com/id/1042105
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3729
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3730
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3731
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3738
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:1948
https://access.redhat.com/errata/RHSA-2019:2565
Patch https://hackerone.com/reports/387250
Third Party Advisory https://lists.debian.org/debian-lts-announce/2018/10/msg00020.html
Third Party Advisory https://security.netapp.com/advisory/ntap-20190221-0002/
Third Party Advisory https://usn.ubuntu.com/3808-1/
Third Party Advisory https://www.debian.org/security/2018/dsa-4332
https://www.oracle.com/security-alerts/cpujan2020.html
Mitigation https://www.ruby-lang.org/en/news/2018/10/17/openssl-x509-name-equality-check-do...
Release Notes https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-3-8-released/
Release Notes https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-4-5-released/
Release Notes https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-5-2-released/
Release Notes https://www.ruby-lang.org/en/news/2018/11/06/ruby-2-6-0-preview3-released/
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html
and 18 more references
56
/ 100
high-risk
Severity 32/34 · Critical
Exploitability 8/34 · Low
Exposure 16/34 · Moderate