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Cross-site Scripting occurrences in Netweaver Process Integration
Java Proxy Runtime of SAP NetWeaver Process Integration, versions 7.10, 7.11, 7.30, 7.31, 7.40, 7.50, does not sufficiently encode user-controlled inputs and allows an attacker to execute malicious scripts in the url thereby resulting in Reflected Cross-Site Scripting (XSS) vulnerability (2019-08-14, CVE-2019-0337)
SAP NetWeaver Process Integration, versions: SAP_XIESR: 7.20, SAP_XITOOL: 7.10 to 7.11, 7.30, 7.31, 7.40, 7.50, does not sufficiently validate user-controlled inputs, which allows an attacker possessing admin privileges to read and modify data from the victim’s browser, by injecting malicious scripts in certain servlets, which will be executed when the victim is tricked to click on those malicious links, resulting in reflected Cross Site Scripting vulnerability. (2019-06-14, CVE-2019-0316)
Why Cross-site Scripting can be dangerous
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>