Ubuntu 10.04 LTS / 10.10 / 11.04 / 11.10 : puppet vulnerability (USN-1238-1)
Low Nessus Plugin ID 56630
SynopsisThe remote Ubuntu host is missing a security-related patch.
DescriptionIt was discovered that Puppet incorrectly handled the non-default 'certdnsnames' option when generating certificates. If this setting was added to puppet.conf, the puppet master's DNS alt names were added to the X.509 Subject Alternative Name field of all certificates, not just the puppet master's certificate. An attacker that has an incorrect agent certificate in his possession can use it to impersonate the puppet master in a man-in-the-middle attack.
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 puppet-common package.