Re: pt_chmod

[karl () bagpuss demon co uk (Karl Strickland)]

> Carson Gaspar wrote:
>
> > Does anyone know what the pt_chmod hole is?  The same suid program exists in
> > Solaris 2.x, and knowing Sun's track record...
>
> By my testing, exactly the same bug exists on Solaris 2.3/SPARC;
> however, it does not cause a security hole there.  The security hole is
> caused by how the SCO execution environment treats NULL dereferences.
> The same bug probably exists in the pt_chmod source on most System V
> systems; whether it causes a security problem depends on how the OS
> treats NULL dereferences.
>
> Full disclosure has been sent to CERT for dissemination to other OS
> vendors.  I am not in a position to publically disclose full details at

you might have cc'd it to 8lgm, to save us a few hours!!! :-)

> this time; I also think that to do so would be rude to other OS vendors
> who have not had a chance to issue their own fixes.
>
> Your pt_chmod is safe if it coredumps when run as `pt_chmod <
> /etc/termcap`.  If not, it might or might not be safe.  Ask your OS
> vendor, "trace" or "truss".

talking of trace, is sco's trace broken?  our copy at least, seems to
miss out system calls.  eg for pt_chmod, trace never shows chown(2)
being called; but if you disassemble it or single step it with adb,
you can see that it does actually get called.

> I'm sorry that I can't say more.  
>
> > Bela<

Well done for getting those patches out so quickly. 

Cheers
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Mailed using ELM on FreeBSD               |                    Karl Strickland
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