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Re: possible fp on 17297
From: matan monitz <mmonitz () gmail com>
Date: Thu, 18 Nov 2010 16:29:15 +0200

hello rmkml
i have read those references before and i have a basic understanding of the
vulnerability, however this does not explain the second content string in
the signature.
filtering based on ports is not relevent since this sig is meant to look at
files being transferd at any protocol.

i can't figure out what you mean by "light"...

attached is the payload from the alerts
you can also strip the http headers with some hex-editor and get the
beginning of valid rar files
weird, they all seem like valid symantec endpoint protection updates...

anyone from VRT care to enlighten us?

On Tue, Nov 16, 2010 at 11:44 PM, rmkml <rmkml () yahoo fr> wrote:

Hi Matan,
added more references:
 http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=515
 http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2007-2152
 http://www.kb.cert.org/vuls/id/324929
 http://www.securityfocus.com/bid/23543
 http://xforce.iss.net/xforce/xfdb/33732
-Maybe check if any ports is good for you or maybe add exception port?
-Maybe add "light" within:200; for checking unicode multibyte,
-and maybe add "light" searching long null byte (separator) ending filename
like: isdataat:64,relative; content:!"|00|"; within:64;

but the best is how length multibyte unicode vulnerability?

do you have a FP example please?
Regards
Rmkml



On Tue, 16 Nov 2010, matan monitz wrote:

 hello
i have been trying to investigate a possible fp for 17297 but i can't
really figure out what the sig is looking for
alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"SPECIFIC-THREATS McAfee
VirusScan on-access scanner long unicode filename handling buffer overflow
attempt"; flow:to_client,established; content:"|52 61 72 21 1A 07 00 CF 90
73 00
00 0D|"; content:"|E2 CA D4 B2 E2 CA D4 B2|"; distance:0; sid:17297;
rev:3;)
i get the first part ("|52 61 72 21 1A 07 00 CF 90 73 00 00 0D|"; ) thats
a rar file header but what is: content:"|E2 CA D4 B2 E2 CA D4 B2|";?  is it
suppose to be something in unicode?
how sure should i be regarding this signature?


Attachment: payload.txt
Description:

------------------------------------------------------------------------------
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