[NEWS] SurfControl Filter for SMTP Can Be Bypassed via Nested Zips
From: SecuriTeam (support_at_securiteam.com)
Date: 07/20/03
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To: list@securiteam.com Date: 20 Jul 2003 20:47:46 +0200
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SurfControl Filter for SMTP Can Be Bypassed via Nested Zips
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SUMMARY
SurfControl Filter for SMTP allows for SurfControl's filtering technology
to be bolted on to your existing SMTP server. The rules engine contains a
flaw whereby if an attachment is a .zip and it contains more than 15 zip
files, the 16th zip file will not be scanned by the filter. This probably
works with other archive/file types and possibly on other SurfControl
products.
DETAILS
Vulnerable systems:
* SurfControl Filter for SMTP version 4.6
In order to bypass the filter build a .zip as below:
attach.zip - dummy_folder - a.zip - junk.txt
- b.zip - junk.txt
- c.zip - junk.txt
- d.zip - junk.txt
- e.zip - junk.txt
- f.zip - junk.txt
- g.zip - junk.txt
- h.zip - junk.txt
- i.zip - junk.txt
- j.zip - junk.txt
- k.zip - junk.txt
- m.zip - junk.txt
- n.zip - junk.txt
- o.zip - junk.txt
- p.zip - junk.txt
- z.zip - sneaky.exe << Passes thru!
(The filter sorts the files in attach.zip alphabetically so we name our
files a, b, c, etc to be sure that z.zip is last)
ADDITIONAL INFORMATION
The information has been provided by <mailto:Lee@networkpenetration.com>
Lee Bowyer.
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