CVE-2013-4248: Canonical Ubuntu Linux

Medium severity, CVSS 4.3. EPSS: 3.6% chance of exploitation in the next 30 days.

The openssl_x509_parse function in openssl.c in the OpenSSL module in PHP before 5.4.18 and 5.5.x before 5.5.2 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

• Canonical Ubuntu Linux: version 10.04 only; version 12.04 only; version 12.10 only; version 13.04 only
• PHP PHP: up to and including 5.4.17; version 5.0.0 only; version 5.0.1 only; version 5.0.2 only; version 5.0.3 only; version 5.0.4 only; …
• Red Hat Enterprise Linux: version 5 only

Published 2013-08-18. Last modified 2026-06-16.