full-disclosure - Re: [SECURITY] [DSA 1639-1] New twiki packages execution of arbitrary code

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Message-ID: <8656dcd50809210131p24acf6e3kc9e9570a7a5d7cf6@mail.gmail.com>
Date: Sun, 21 Sep 2008 14:01:36 +0530
From: "webby devil" <w3bd3vil@...il.com>
To: full-disclosure@...ts.grok.org.uk
Cc: stx@...ian.org
Subject: Re: [SECURITY] [DSA 1639-1] New twiki packages
	execution of arbitrary code

Steve,

I just had a look at your patch and it seems to me that you just filter out
the remote command execution and not the file disclosure in Twiki.
http://security.debian.org/pool/updates/main/t/twiki/twiki_4.0.5-9.1etch1.diff.gz

The configure file is patched with this
   if ( $image =~ /^([-.\w]+)$/ ) {
        $image = $1;
    }
You are basically allowing the ../../../ which can be used for
../../../etc/passwd

In terms of example, what you have done is filter out
/bin/configure?action=image;image=|ls%20-l|;type=text/plain
and not
/bin/configure?action=image;image=|../../../../../../etc/passwd|;type=text/plain

Regards,
webDEViL

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