Ubuntu 7.04 / 7.10 / 8.04 LTS : openssh update (USN-612-5)
High Nessus Plugin ID 32359
SynopsisThe remote Ubuntu host is missing one or more security-related patches.
DescriptionMatt Zimmerman discovered that entries in ~/.ssh/authorized_keys with options (such as 'no-port-forwarding' or forced commands) were ignored by the new ssh-vulnkey tool introduced in OpenSSH (see USN-612-2).
This could cause some compromised keys not to be listed in ssh-vulnkey's output.
This update also adds more information to ssh-vulnkey's manual page.
A weakness has been discovered in the random number generator used by OpenSSL on Debian and Ubuntu systems. As a result of this weakness, certain encryption keys are much more common than they should be, such that an attacker could guess the key through a brute-force attack given minimal knowledge of the system. This particularly affects the use of encryption keys in OpenSSH, OpenVPN and SSL certificates.
Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpdate the affected packages.