Synopsis
The remote Debian host is missing a security-related update.
Description
Dan Kaminsky and Moxie Marlinspike discovered that gnutls, an implementation of the TLS/SSL protocol, does not properly handle a '\0' character in a domain name in the subject's Common Name or Subject Alternative Name (SAN) 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.
(CVE-2009-2730 )
In addition, with this update, certificates with MD2 hash signatures are no longer accepted since they're no longer considered cryptograhically secure. It only affects the oldstable distribution (etch).(CVE-2009-2409 )
Solution
Upgrade the gnutls13/gnutls26 packages.
For the oldstable distribution (etch), these problems have been fixed in version 1.4.4-3+etch5 for gnutls13.
For the stable distribution (lenny), these problems have been fixed in version 2.4.2-6+lenny2 for gnutls26.