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The RPMs for groff that come with RH 6.0 apply a patch, groff-1.11-safer.patch, which removes the unsafe groff commands. It is possible that the unsafe commands could find their way back in should the user decide to rebuild groff and not take the time to kill the unsafe commands. This situation can be avoided by changing the /etc/man.config file. The TROFF and NROFF lines should be modified to include the -S flag, indicating that the "safer" mode of groff should be used for formatting man pages.
If someone rebuilds groff and introduces a security hole, then they are putting themselves at risk. adding the -S field to /etc/man.config will only move the problem around -- other applications / uses of groff will still have the hole. This not truly lead to better security. We do not recommend that people rebuild packages unless they are very sure they understand what they are doing.