Exploit the possiblities

ircu-dos.txt

ircu-dos.txt
Posted Mar 24, 2008
Authored by Chris Porter | Site warp13.co.uk

ircu versions 2.10.12.12 and below and snircd versions 1.3.4 and below suffer from a denial of service vulnerability.

tags | advisory, denial of service
MD5 | 74d2996986b18fd1e9cac7b0f213165a

ircu-dos.txt

Change Mirror Download
Affected software
-----------------

ircu (upto and including 2.10.12.12)
snircd (upto and including 1.3.4)
and many other ircu derivatives

Vulnerability details
---------------------

send_user_mode in s_user.c does not check that the argument after a +r mode
is present, if it is not than the NULL sentinel may be missed, causing the
function to iterate over the boundary of the array.

One possible exploit:
/mode nickname i i i i i i i i i i i i i i i r r r r s

This won't work if there's another NULL directly after the first from the
previous parsed command, if this is the case one can just append more modes
or send some other junk to the ircd.

Resolution
----------

Upgrade to the very latest version of ircu/snircd.

Disclosure timeline
-------------------

2008-03-15: Vulnerability discovered by QuakeNet and reported to Undernet.
2008-03-15: Patches released.
2008-03-17: Patches applied to public servers.
2008-03-24: Public disclosure.

--
Chris Porter (slug on QuakeNet)
http://www.warp13.co.uk

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