mIRC 6.12 (latest) DCC Exploit

2007.10.25
Risk: Low
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

this news was found on irchelp, DCC Exploit Affecting mIRC 6.12 : another exploit was identified which can crash even the recently released version 6.12. It only seems to affect people who minimize DCC get dialog windows (manually or by default), and then open those windows to get a file with an excessively long filename. You can't be crashed unless that sequence of events occurs. That manual step is required. If you auto-get the file, or don't get the file at all, nothing happens. If and only if you think the above affects you, then here is a temporary fix which should be pasted in your "remotes" section (alt-r to access). It basically rejects any excessively long filename. ctcp *:dcc send:*: if ($len($nopath($filename)) >= 225) { echo 4 -s $nick tried to crash you with an illegal dcc send of $nopath($filename) | halt } or this shorter version without the warning message: ctcp *:dcc send:*: if ($len($nopath($filename)) >= 225) halt If you are not comfortable with modifying your remotes, you can just ignore all incoming DCC sends with the following, which is the same temporary fix as for the other bug described in the next section: /ignore -wd * You can undo the above command by /ignore -rwd * (note the r for remove). Regards. K-OTik Staff /// http://www.k-otik.com


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