CVE-2009-3639
EPSS 1.4%proftpd-dfsg - SSL certificate verification weakness
Published: 10/28/2009Modified: 4/28/2026
Also known as:DEBIAN-CVE-2009-3639
Description
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.
Affected packages (2)
- Debian/proftpd-dfsgfrom 0, < 1.3.2a-2
- Debian/proftpd-dfsgfrom 0, < 1.3.0-19etch3