Dick Franks reported that a new version of Net::DNS is available This version fixes a potential security problem, described: http://rt.cpan.org/Public/Bug/Display.html?id=23961 Updates for fedora and RHEL are recommended.
Cc-ing Josh Bressers as part of the update is security related. Note - I know of no exploits in the wild, however, as described in the RT above, some issues have been noticed by users. In particular, this link: http://www.nntp.perl.org/group/perl.qpsmtpd/2006/03/msg4810.html has a script which demonstrates the problem. On my fc-7 system with perl-Net-DNS-0.59-2.fc7, all of the child processes have the same 'ID's. With perl-Net-DNS-0.60-1.fc7, the IDs are randomized.
perl-Net-DNS-0.60-1.fc7 has been pushed to the Fedora 7 stable repository. If problems still persist, please make note of it in this bug report.