The remote host is missing an update to openssl announced via advisory USN-353-2.
A security issue affects the following Ubuntu releases:
Ubuntu 5.04 Ubuntu 5.10 Ubuntu 6.06 LTS
This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu.
USN-353-1 fixed several vulnerabilities in OpenSSL. However, Mark J Cox noticed that the applied patch for CVE-2006-2940 was flawed. This update corrects that patch.
For reference, this is the relevant part of the original advisory:
Certain types of public key could take disproportionate amounts of time to process. The library now limits the maximum key exponent size to avoid Denial of Service attacks. (CVE-2006-2940)
Solution: The problem can be corrected by upgrading your system to the following package versions:
Ubuntu 5.04: libssl0.9.7 0.9.7e-3ubuntu0.6
Ubuntu 5.10: libssl0.9.7 0.9.7g-1ubuntu1.5
Ubuntu 6.06 LTS: libssl0.9.8 0.9.8a-7ubuntu0.3
After a standard system upgrade you need to reboot your computer to effect the necessary changes.