CA 2E Web Option 8.1.2 - Authentication Bypass

Vulnerability title: Unauthenticated Privilege Escalation in CA 2E Web Option

CVE: CVE-2014-1219
Vendor: CA
Product: 2E Web Option
Affected version: 8.1.2
Fixed version: N/A
Reported by: Mike Emery

Details:

CA 2E Web Option (r8.1.2) and potentially others, is vulnerable to unauthenticated privilege escalation via a predictable session token.
The POST parameter session token W2E_SSNID appears as follows:

W2E_SSNID=W90NIxGoSsN1023ZYW2E735182000013CLSpKfgkCJSLKsc600061JKenjKnE
JuNX9GoVjCEbqIuKh6kFRvbzYnUxgQtONszJldyAar3LtTSwsmBLpdlPc5iDH4Zf75


However, this token is poorly validated, leading to

W2E_SSNID=W90NIxGoSsN1023ZYW2E735182000013

being accepted as a valid session. By incrementing and
decrementing the digits at the end of the value given above, it is
possible to control the session at the given ID. This token is sent as
part of the login page, and as such, can be manipulated by an
unauthenticated attacker, giving them access to any valid session.
Consequentially, it is possible to access the following page as such:

https://app.domain.co.uk/web2edoc/close.htm?SSNID=W90NIxGoSsN1023ZYW2E735182000026

Ending the session specified, which could lead to a denial of service condition.

Further details at:
http://portcullis-security.com/security-research-and-downloads/security-advisories/cve-2014-1219/


Copyright:
Copyright (c) Portcullis Computer Security Limited 2014, 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.