Kaseya VSA 6.5 Parameter Reflected XSS, Enumeration and Bruteforce Weakness
Kaseya VSA v188.8.131.52.
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 =E2=80=9CNo record=
this user exists=E2=80=9D, where a valid username returns =E2=80=9CThe syst=
you a link. Visit it to change your password.=E2=80=9D
This makes it much easier to brute force accounts.
2. The password reset URL, such as
https://[target]/access/resetAccount.asp?id=3D26756180, is not
significantly complex to prevent brute force attacks. The software
should use a GUID (5.3=C3=9710^36 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=3Dlogon.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 184.108.40.206+.
04-Apr-2017 - Public disclosure.
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