U-office Force Cross-site Scripting

U-Office Force Bulletin function has insufficient filtering for special characters. An unauthenticated remote attacker can exploit this vulnerability to inject JavaScript and perform XSS (Reflected Cross-Site Scripting) attack. (2022-10-31, CVE-2022-39024)

U-Office Force Forum function has insufficient filtering for special characters. A remote attacker with general user privilege can inject JavaScript and perform XSS (Stored Cross-Site Scripting) attack. (2022-10-31, CVE-2022-39027)

U-Office Force PrintMessage function has insufficient filtering for special characters. An unauthenticated remote attacker can exploit this vulnerability to inject JavaScript and perform XSS (Reflected Cross-Site Scripting) attack. (2022-10-31, CVE-2022-39025)

U-Office Force UserDefault page has insufficient filtering for special characters in the HTTP header fields. A remote attacker with general user privilege can exploit this vulnerability to inject JavaScript and perform XSS (Stored Cross-Site Scripting) attack. (2022-10-31, CVE-2022-39026)

Cross site scripting is an attack where a web page executes code that is injected by an adversary. It usually appears, when users input is presented. This attack can be used to impersonate a user, take over control of the session, or even steal API keys.

The attack can be executed e.g. when you application injects the request parameter directly into the HTML code of the page returned to the user:

https://server.com/confirmation?message=Transaction+Complete

what results in:

<span>Confirmation: Transaction Complete</span>

In that case the message can be modified to become a valid Javascript code, e.g.:

https://server.com/confirmation?message=<script>dangerous javascript code here</script>

and it will be executed locally by the user's browser with full access to the user's personal application/browser data:

<span>Confirmation: <script>dangerous javascript code here</script></span>