Re: netscape bug

In article <DFALB4.A5u@sgi.sgi.com>, "Perry E. Metzger" <perry@piermont.com> writes:

> I can tell you in general terms -- I don't write MIPS assembler
> myself. However, I will point out to you that you use an ancient
> Sendmail, and that it uses syslog(3) on user produced data, and that
> syslog uses a static buffer. Trick sendmail into logging something
> very big, and you can do what you like. The 8lgm people wrote a demo
> for Sparc as a proof of concept.

Hmm, after having looked at the syslogd code, it looks like this
particular bug has been fixed for at least several years.  However,
there sure are a hell of a lot of fixed size buffers being alocated off
the stack and some of them are being used in unsafe ways.

-- 
Sure we spend a lot of money, but that doesn't mean    |  Tom Weinstein
we *do* anything.  --  Washington DC motto             |  tomw@engr.sgi.com

Tom Weinstein writes:
> In article <DFALB4.A5u@sgi.sgi.com>, "Perry E. Metzger" <perry@piermont.com> 
writes:
> 
> > I can tell you in general terms -- I don't write MIPS assembler
> > myself. However, I will point out to you that you use an ancient
> > Sendmail, and that it uses syslog(3) on user produced data, and that
> > syslog uses a static buffer. Trick sendmail into logging something
> > very big, and you can do what you like. The 8lgm people wrote a demo
> > for Sparc as a proof of concept.
> 
> Hmm, after having looked at the syslogd code, it looks like this
> particular bug has been fixed for at least several years.

I said syslog(3), not syslogd(8).

The bug is in the client, not the server. Yes, you suffer from it. Go
and check.

> However, there sure are a hell of a lot of fixed size buffers being
> alocated off the stack and some of them are being used in unsafe
> ways.

Perry