CVE-2009-3639
proftpd-dfsg - SSL certificate verification weakness
EPSS 1.4%
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.
How to fix CVE-2009-3639
To remediate CVE-2009-3639, upgrade the affected package to a fixed version below.
- Debian/proftpd-dfsg—upgrade to 1.3.2a-2 or later
- —upgrade to 1.3.0-19etch3 or later
Is CVE-2009-3639 being exploited?
Low — EPSS is 1.4%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 1.3.2a-2
- from 0, < 1.3.0-19etch3