full-disclosure - Re: Unfiltered escape sequences in filenames contained in ZIP archives wouldn't be escaped on displaying or logging, and can also lead to bypass AV scanning

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Message-ID: <20984234066C9C180F99593D@[10.3.62.6]>
From: pbieringer at aerasec.de (Dr. Peter Bieringer)
Subject: Re: Unfiltered escape sequences in filenames
 contained in ZIP
 archives  wouldn't be escaped on displaying or logging, and can also lead to
 bypass AV scanning



--On Dienstag, 15. M?rz 2005 13:51 -0600 "Michael J. Pomraning" 
<mjp-bugtraq@...urepipe.com> wrote:

>    $ /usr/local/bin/sweep -ss -archive -all
> unfiltered-escape-sequences-in-filename-eicar.zip     >>> Virus
> 'EICAR-AV-Test' found in file
> unfiltered-escape-sequences-in-filename-eicar.zip/Test_[2J_[2;5m_[1;31mHA
> CKER ATTACK_[2;25m_[22;30m_[3q.txt/eicar_com.zip/eicar.com    $ md5sum
> unfiltered-escape-sequences-in-filename-eicar.zip
>    38363004047dc11b206305bd3660d68f
> unfiltered-escape-sequences-in-filename-eicar.zip
>
> This is using engine 2.28.4, as in your tests.  The consituent filenames
> are escaped before being displayed, too (sadly excepting ASCII BEL).

Also not ASCII BS, we've created an additional ZIP file for testing:

Available here:
<ftp://ftp.aerasec.de/pub/advisories/unfiltered-escape-sequences/mixed2-eicar.zip>

$ unzip -l mixed2-eicar.zip
Archive:  mixed2-eicar.zip
  Length     Date   Time    Name
 --------    ----   ----    ----
      308  03-10-05 12:00   eicarcom2.zip^H^H^Htxt
      308  03-10-05 12:00   eicarcom2.zip
 --------                   -------
      616

$ /usr/local/bin/sweep -sc -nc -ss  -archive -all mixed2-eicar.zip
>>> Virus 'EICAR-AV-Test' found in file
>>> mixed2-eicar.zip/eicarcom2.txt/eicar_com.zip/eicar.com
>>> Virus 'EICAR-AV-Test' found in file
>>> mixed2-eicar.zip/eicarcom2.zip/eicar_com.zip/eicar.com

Note the difference: eicarcom2.txt <-> eicarcom2.zip

Regards,
	Peter
-- 
Dr. Peter Bieringer                             Phone: +49-8102-895190
AERAsec Network Services and Security GmbH        Fax: +49-8102-895199
Wagenberger Strasse 1                          Mobile: +49-174-9015046
D-85662 Hohenbrunn                       E-Mail: pbieringer@...asec.de
Germany                                Internet: http://www.aerasec.de