Bug 79705 – net-irc/ngircd: Multiple vulnerabilities

• Status: RESOLVED FIXED
• Product: Gentoo Security

[Description Florian Westphal 2005-01-27 05:32:57 UTC]

There is a buffer overflow in ngircd, src/ngircd/lists.c; in Lists_MakeMask().
It is caused by an integer underflow in line 317:

317  strlcpy( TheMask, Pattern, sizeof( TheMask ) - strlen( at ) - 4 );

strlen( at ) - 4 can be larger than sizeof( TheMask ).


Reproducible: Always
Steps to Reproduce:
1. netcat / telnet to a ngirc daemon.
2. type
USER a b c d
NICK b
JOIN \#b
MODE \#b +b aaaa....aa@aaaa...aaa
Actual Results:  
Daemon segfaults.

Expected Results:  
Truncate the string.

Fixed in ngircd 0.8.2.
http://arthur.ath.cx/pipermail/ngircd-ml/2005-January/000228.html

[Comment 1 Thierry Carrez (RETIRED) 2005-01-27 05:45:02 UTC]

Many thanks for letting us know so fast, Florian.
net-irc team please bump to newest package.

[Comment 2 Sven Wegener 2005-01-27 07:23:12 UTC]

net-irc/ngircd-0.8.2 in CVS and stable on x86.

[Comment 3 Thierry Carrez (RETIRED) 2005-01-27 08:07:46 UTC]

GLSA drafted.
Florian: couldn't that vulnerability also be used to execute arbitrary code ?

[Comment 4 Florian Westphal 2005-01-27 09:16:32 UTC]

I was only able to crash the server, but this is most likely because of my clumsy efforts. Given that the input comes from the client (and is under very few restrictions) someone more skilled might be able to exploit this.

[Comment 5 Thierry Carrez (RETIRED) 2005-01-28 14:09:09 UTC]

GLSA 200501-40