TITLE:
VHCS Security Issue and Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA18799

VERIFY ADVISORY:
http://secunia.com/advisories/18799/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass, Cross Site Scripting, Privilege escalation

WHERE:
>From remote

SOFTWARE:
VHCS 2.x
http://secunia.com/product/4489/

DESCRIPTION:
Román Medina-Heigl Hernández has reported some vulnerabilities in
VHCS, which can be exploited by malicious people to conduct script
insertion attacks, and by malicious users to bypass certain security
restrictions and gain escalated privileges.

1) Input passed to the username field in the login page isn't
sanitised before being stored in the admin log. This can be exploited
to execute arbitrary HTML and script code in the Administrators'
browser session in context of an affected website when the
Administrator views the log in the "Admin Log" functionality.

The vulnerability has been reported in version 2.4.6.2 and 2.4.7.1.
Prior versions may also be affected.

2) The gui/admin/change_password.php script does not validate user's
current password before allowing the password to be changed.

The security issue has been reported in version 2.4.6.2 and 2.4.7.1.
Prior versions may also be affected.

3) The "check_login()" function in gui/include/login.php does not
properly terminate the script when user session validation fails.
This can be exploited to bypass session validation in certain scripts
such as admin/add_user.php, which may be exploited to added admin
users.

The vulnerability has been reported in version 2.4.6.2 and 2.4.7.1.
Prior versions may also be affected.

4) The gui/admin/add_user.php script does not validate user's rights
before allowing admin users to be added. This may be exploited by
less privileged users to add new admin user to the system.

The vulnerability has been reported in version 2.4.6.2 and 2.4.7.1.
Prior versions may also be affected.

SOLUTION:
Apply Security Patch 2006-02-09.
http://vhcs.net/new/modules/news/article.php?storyid=25

Note: This does not fix #2 and #4.

PROVIDED AND/OR DISCOVERED BY:
Román Medina-Heigl Hernández

ORIGINAL ADVISORY:
http://www.rs-labs.com/adv/RS-Labs-Advisory-2006-1.txt

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