CVE-2009-3639

The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2,
when the dNSNameRequired TLS option is enabled, does not properly handle a
‘\0’ character in a domain name in the Subject Alternative Name field of an
X.509 client certificate, which allows remote attackers to bypass intended
client-hostname restrictions via a crafted certificate issued by a
legitimate Certification Authority, a related issue to CVE-2009-2408.

Bugs

• <https://bugzilla.redhat.com/show_bug.cgi?id=530719&gt;
• <http://bugs.proftpd.org/show_bug.cgi?id=3275&gt;