The remote host is missing an update to fetchmail announced via advisory USN-520-1.
A security issue affects the following Ubuntu releases:
Ubuntu 6.06 LTS Ubuntu 6.10 Ubuntu 7.04
This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu.
Details follow:
Gaetan Leurent discovered a vulnerability in the APOP protocol based on MD5 collisions. As fetchmail supports the APOP protocol, this vulnerability can be used by attackers to discover a portion of the APOP user's authentication credentials. (CVE-2007-1558)
Earl Chew discovered that fetchmail can be made to de-reference a NULL pointer when contacting SMTP servers. This vulnerability can be used by attackers who control the SMTP server to crash fetchmail and cause a denial of service. (CVE-2007-4565)
Solution: The problem can be corrected by upgrading your system to the following package versions:
Ubuntu 6.06 LTS: fetchmail 6.3.2-2ubuntu2.2
Ubuntu 6.10: fetchmail 6.3.4-1ubuntu4.2
Ubuntu 7.04: fetchmail 6.3.6-1ubuntu2.1
In general, a standard system upgrade is sufficient to affect the necessary changes.