full-disclosure - 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: <200503152106.05974.njh@bandsman.co.uk>
From: njh at bandsman.co.uk (Nigel Horne)
Subject: 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 Tuesday 15 Mar 2005 17:29, Rodrigo Barbosa wrote:
> On Tue, Mar 15, 2005 at 05:45:58PM +0100, Dr. Peter Bieringer wrote:
> > >I STIL FIND IT happy to
> > >see there are lot of AV out there that cant scan such
> > >file properly to detect virus.
> >
> > The problem must be located in the unzip engine:
> >
> > We've created a mixed ZIP now:
> >
> > # unzip -l mixed-eicar.zip
> > Archive:  mixed-eicar.zip
> >  Length     Date   Time    Name
> > --------    ----   ----    ----
> >      308  03-10-05 12:00   Test^G^[[2J^[[2;5m^[[1;31mHACKER
> > ATTACK^[[2;25m^[[22;30m^[[3q.txt
> >      308  03-10-05 12:00   eicarcom2.zip
> > --------                   -------
> >      616                   2 files
> >
> >
> > BTW: note here that "unzip" displays the escape sequences very proper!
> >
> > Available here:
> > <ftp://ftp.aerasec.de/pub/advisories/unfiltered-escape-sequences/mixed-eicar.zip>
> >
> > Some AV software detect the virus only in second part of the ZIP file, so
> > it looks like the first one is really skipped and not analysed.
> 
> F-Prot seems to detect it correctly:

As does clamAV:
[njh@njh tmp]$ clamscan mixed-eicar.zip
mixed-eicar.zip: Eicar-Test-Signature FOUND

----------- SCAN SUMMARY -----------
Known viruses: 31606
Engine version: devel-20050312
Scanned directories: 0
Scanned files: 1
Infected files: 1
Data scanned: 0.00 MB
Time: 0.501 sec (0 m 0 s)

-- 
Nigel Horne. Arranger, Composer, Typesetter.
NJH Music, Barnsley, UK.  ICQ#20252325
njh@...pammed.com http://www.bandsman.co.uk