CVE-2013-4073

Severity: medium (CVSS 6.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2013-08-18 · updated 2026-06-16
Weakness: CWE-310

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.

Affected products

Ruby: 1.8.6-26, 1.8.7, 1.8.7-p160, 1.8.7-p17, 1.8.7-p173, 1.8.7-p174 (+36)

References

http://forums.interworx.com/threads/8000-InterWorx-Version-5-0-14-Released-on-Beta-Channel%21
http://lists.apple.com/archives/security-announce/2013/Oct/msg00004.html
http://lists.opensuse.org/opensuse-updates/2013-07/msg00042.html
http://lists.opensuse.org/opensuse-updates/2013-07/msg00044.html
http://rhn.redhat.com/errata/RHSA-2013-1090.html
http://rhn.redhat.com/errata/RHSA-2013-1103.html
http://rhn.redhat.com/errata/RHSA-2013-1137.html
http://support.apple.com/kb/HT6150
http://www.debian.org/security/2013/dsa-2738
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/
http://www.ubuntu.com/usn/USN-1902-1

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