Re: w00w00's efnet ircd advisory (exploit included)

[lusky () BLOWN NET (Jonathan R. Lusky)]

Shok writes:
> [http://www.w00w00.org, comments to shok () dataforce net]
>
> SUMMARY
> efnet ircd hybrid-6 (up to beta 58) have a vulnerability that can allow
> remote access to the irc server.  In most cases, you'll gain privileges of
> the 'irc' user.

The buffer mentioned in the advisory was introduced in ircd-hybrid-6b17
and fixed in ircd-hybrid-6b75.  All EFnet servers have upgraded or patched.
Hybrid-6 is still in semi-private beta and has not been released publicly.
The current release version of Hybrid is ircd-hybrid-5.3p7, which is not
vulnerable.

The bug report address for Hybrid is The bug report address for Hybrid is ircd-hybrid () the-project org.
[ insert notifying-the-author speech--first we heard about someone finding
a way to exploit this overflow was your bugtraq posting. ]

There is also a mailing list for general discussion of Hybrid.  To subscribe
to the Hybrid List, send email to hybrid-request () the-project org with
the subject "subscribe".

> COMMENTS
> This vulnerability was discovered by jduck and stranjer of w00w00 at
> least 2 months ago.  After discussing the vulnerability, it was reported
> to Dianora by jduck and fixed.  Hopefully the vulnerable irc servers have
> been fixed.  If not, it's unfortunate Dianora didn't notify the vulnerable
> irc servers or they didn't take these 2 months to fix themselves (note:
> we didn't wait that long on purpose.. we were just sidetracked with a
> million other things).
>
> DESCRIPTION
> The vulnerability is in the invite handling code (m_invite).  In a
> channels with operators (ops) and modes +pi (paranoid + invite-only), a
> channel invitation is reported to all other operators.  The buffer used to
> store the invitation notice can overflow its boundaries by up to 15
> bytes.