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Re: Troff dangerous.
From: sky () WIBBLE NET INVALID (Nic Bellamy)
Date: Mon, 26 Jul 1999 10:42:06 +1200

On Sun, 25 Jul 1999, John Robert LoVerso wrote:

Thus, this affects only systems with groff installed (all Linux and FreeBSD
systems, at least).

One Linux distribution that doesn't appear to be vulnerable is Debian
(tested on 2.1/slink) - the maintainer of the groff package has made the
-S ("Safer mode") the default, which turns off potentially dangerous
commands like .opena, .pso, etc.

Hopefully this change can make it into the official GNU groff distribution
- as useful as these features may be, I doubt the majority of people use
groff for much more than formatting manpages. Safe defaults are always

I've also checked OpenBSD 2.5 and FreeBSD 3.2 - the groff on both systems
defaults to the unsafe behaviour.


P.S. My apologies for the From: address mangling - I received far too many
     vacation messages and spams last time I posted here.

-- Nic Bellamy <-- Nic Bellamy <sky () wibble net invalid>
   J. Random Coder.

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