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TITLE:
Yourplace Security Issue and Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA33272

VERIFY ADVISORY:
http://secunia.com/advisories/33272/

CRITICAL:
Highly critical

IMPACT:
Security Bypass, Exposure of sensitive information, DoS, System
access

WHERE:
>From remote

SOFTWARE:
Yourplace 1.x
http://secunia.com/advisories/product/19256/

DESCRIPTION:
Some vulnerabilities and a security issue have been discovered in
Yourplace, which can be exploited by malicious people to disclose
potentially sensitive information, bypass certain security
restrictions, cause a DoS (Denial of Service), and compromise a
vulnerable system.

1) Input passed to various parameters in internettoolbar/edit.php is
not properly sanitised before being stored in
user/internettoolbar/index.php. This can be exploited to inject
arbitrary PHP code by sending a specially crafted HTTP POST request
to the script.

2) It is possible to view certain system information returned by the
"phpinfo()" function by accessing the user/uploads/phpinfo.php script
directly.

3) The login/register_form.php script does not properly check for
existing usernames when creating new accounts, which can be exploited
to stop users from logging in by registering an account with the
username of the target user.

4) The "user/info/users.txt" file is stored with insecure permissions
inside the web root. This can be exploited to gain knowledge of
sensitive information (usernames and hashed passwords) by downloading
the file.

5) The internettoolbar/edit.php script and potentially other scripts
do not properly stop processing if no valid session username is
found, which can be exploited to e.g. edit the toolbar settings
without having a valid user account.

The security issue and the vulnerabilities are confirmed in version
1.0.2. Other versions may also be affected.

SOLUTION:
Edit the source code to ensure that input is properly sanitised.
Restrict access to trusted users only (e.g. via ".htaccess").

PROVIDED AND/OR DISCOVERED BY:
1-4) Osirys
5) An anonymous person.

ORIGINAL ADVISORY:
http://milw0rm.com/exploits/7545

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