Re: Troff dangerous.

[smb () RESEARCH ATT COM (Steven M. Bellovin)]

In message <199907251418.KAA05569 () loverso southborough ma us>, John Robert LoVe
rso writes:
> This isn't a problem with "troff" or any of it's varients.  Instead,
> this is an exploit purely with "groff", the GNU reimplementation.  Troff
> doesn't have the file stream or ".pso" requests; those are purely part
> of groff.
>
> Thus, this affects only systems with groff installed (all Linux and FreeBSD
> systems, at least).
>
> John
Umm, not quite.  My 1976 (no, that's not a typo) nroff/troff manual has
.pi -- pipe output to program; .sy is also ancient, and probably there since
at least since 1977.  My 1981 addendum also lists .! as another way to do
shell escapes.