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Kaseya VSA 6.5 Parameter Reflected XSS, Enumeration and Bruteforce Weakness
Kaseya VSA v220.127.116.11.
1. The "forgot password" function at https://[target]/access/logon.asp
reveals whether a username is valid/exists or not, which assists with
brute force attacks. An incorrect username responds with “No record of
this user exists”, where a valid username returns “The system emailed
you a link. Visit it to change your password.”
This makes it much easier to brute force accounts.
2. The password reset URL, such as
https://[target]/access/resetAccount.asp?id=26756180, is not
significantly complex to prevent brute force attacks. The software
should use a GUID (5.3×10^36 combinations) globally unique value
instead to prevent brute force. The server response permits data
matching to ascertain whether a guessed id value is valid or not.
3. The URL at https://[target]/access/accessRoot.asp?page=logon.asp
contains a cross-site scripting vulnerability. Authentication cookies
the client web browser.
Vulnerability discovered by Patrick Webster
20-Aug-2014 - Discovered during audit.
24-Aug-2014 -Sent to vendor.
25-Aug-2014 - Vendor response.
15-Oct-2014 - Vendor partially patched. Additional fixes due in 2
weeks. version 18.104.22.168+.
04-Apr-2017 - Public disclosure.
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