CVE-2018-16395
UnknownEPSS 10.71%
Last modified
CVE-2018-16395 is a vulnerability of currently unknown severity. 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. EPSS estimates a 10.71% chance of exploitation in the next 30 days.
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.
Metrics
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Ruby-Lang | Openssl | < 2.1.2 | — |
| Ruby-Lang | Ruby | >= 2.3.0, <= 2.3.7 | — |
| Ruby-Lang | Ruby | >= 2.4.0, <= 2.4.4 | — |
| Ruby-Lang | Ruby | >= 2.5.0, <= 2.5.1 | — |
| Ruby-Lang | Ruby | 2.6.0 | Preview1 |
| Canonical | Ubuntu Linux | 14.04 | — |
| Canonical | Ubuntu Linux | 16.04 | — |
| Canonical | Ubuntu Linux | 18.04 | — |
| Canonical | Ubuntu Linux | 18.10 | — |
| Debian | Debian Linux | 8.0 | — |
| Debian | Debian Linux | 9.0 | — |
| Redhat | Enterprise Linux | 7.4 | — |
References
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.htmlMailing List, Third Party Advisory
- http://www.securitytracker.com/id/1042105Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:3729Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3730Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3731Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3738Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1948Third Party Advisory
- https://hackerone.com/reports/387250Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/10/msg00020.htmlThird 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-4332Third Party Advisory
- https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-3-8-released/Release Notes, Vendor Advisory
- https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-4-5-released/Release Notes, Vendor Advisory
- https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-5-2-released/Release Notes, Vendor Advisory
- https://www.ruby-lang.org/en/news/2018/11/06/ruby-2-6-0-preview3-released/Release Notes, Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.htmlMailing List, Third Party Advisory
- http://www.securitytracker.com/id/1042105Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:3729Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3730Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3731Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3738Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1948Third Party Advisory
- https://hackerone.com/reports/387250Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/10/msg00020.htmlThird 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-4332Third Party Advisory
- https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-3-8-released/Release Notes, Vendor Advisory
- https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-4-5-released/Release Notes, Vendor Advisory
- https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-5-2-released/Release Notes, Vendor Advisory
- https://www.ruby-lang.org/en/news/2018/11/06/ruby-2-6-0-preview3-released/Release Notes, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2018-16395?
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.
How severe is CVE-2018-16395?
Severity scoring for CVE-2018-16395 is pending analysis. The EPSS model estimates a 10.71% probability of exploitation in the next 30 days.
How do I fix CVE-2018-16395?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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