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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=W90NIxGoSsN1023ZYW2E735182000013CLSpKfgkCJSLKsc600061JKenjKnEDJuNX9GoVjCEbqIuKh6kFRvbzYnUxgQtONszJldyAar3LtTSwsmBLpdlPc5iDH4Zf75

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.

Impact:

This vulnerability allows for unauthenticated Privilege Escalation.

Exploit:

Exploit code is not required.

Vendor status:

23/10/2013 Advisory created
11/11/2013 Vendor contacted
27/11/2013 Vendor contact reattempted
14/01/2014 CVE obtained
11/02/2014 Published
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