CVE-2013-4073

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.

Category

6.8
CVSS
Severity: Medium
CVSS 2.0 •
EPSS 2.39% Top 20%
Vendor Advisory debian.org Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory apple.com Vendor Advisory opensuse.org Vendor Advisory redhat.com Vendor Advisory opensuse.org Vendor Advisory debian.org Vendor Advisory ruby-lang.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.debian.org/security/2013/dsa-2738 vendor advisory
http://www.ubuntu.com/usn/USN-1902-1 vendor advisory
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 vendor advisory
http://rhn.redhat.com/errata/RHSA-2013-1103.html vendor advisory
http://lists.apple.com/archives/security-announce/2013/Oct/msg00004.html vendor advisory
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 vendor advisory
http://rhn.redhat.com/errata/RHSA-2013-1137.html vendor advisory
http://lists.opensuse.org/opensuse-updates/2013-07/msg00044.html vendor advisory
http://www.debian.org/security/2013/dsa-2809 vendor advisory
http://www.ruby-lang.org/en/news/2013/06/27/hostname-check-bypassing-vulnerability-in-openssl-client-cve-2013-4073/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2013-4073?
CVE-2013-4073 has been scored as a medium severity vulnerability.
How to fix CVE-2013-4073?
To fix CVE-2013-4073, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2013-4073 being actively exploited in the wild?
It is possible that CVE-2013-4073 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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