CVE-2018-16395

HIGH

Description

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.

References

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html

http://www.securitytracker.com/id/1042105

https://access.redhat.com/errata/RHSA-2018:3729

https://access.redhat.com/errata/RHSA-2018:3730

https://access.redhat.com/errata/RHSA-2018:3731

https://access.redhat.com/errata/RHSA-2018:3738

https://access.redhat.com/errata/RHSA-2019:1948

https://access.redhat.com/errata/RHSA-2019:2565

https://hackerone.com/reports/387250

https://lists.debian.org/debian-lts-announce/2018/10/msg00020.html

https://security.netapp.com/advisory/ntap-20190221-0002/

https://usn.ubuntu.com/3808-1/

https://www.debian.org/security/2018/dsa-4332

https://www.ruby-lang.org/en/news/2018/10/17/openssl-x509-name-equality-check-does-not-work-correctly-cve-2018-16395/

https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-3-8-released/

https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-4-5-released/

https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-5-2-released/

https://www.ruby-lang.org/en/news/2018/11/06/ruby-2-6-0-preview3-released/

Details

Source: MITRE

Published: 2018-11-16

Updated: 2019-10-03

Risk Information

CVSS v2.0

Base Score: 7.5

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Impact Score: 6.4

Exploitability Score: 10

Severity: HIGH

CVSS v3.0

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 3.9

Severity: CRITICAL