Executive Summary

This vulnerability is a stored Cross Site Scripting (XSS) issue in the bulletin board (SchwarzeBrett) feature of adata Software GmbH Mitarbeiter Portal version 2.15.2.0. It allows remote authenticated users to inject and execute arbitrary JavaScript code in the web browsers of other users by manipulating the 'Inhalt' parameter in specific requests related to creating or editing messages.

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Impact Analysis

The vulnerability can allow attackers who are authenticated users to execute malicious JavaScript code in other users' browsers. This can lead to session hijacking, theft of sensitive information, unauthorized actions performed on behalf of users, or distribution of malware.

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Detection Guidance

This vulnerability can be detected by attempting to inject a script payload into the bulletin board message creation or editing endpoints and observing if the script executes when viewing the message details. For example, an authenticated user can send a POST request to `/SchwarzeBrett/Nachrichten/EditNachricht/<id>` with the `Inhalt` parameter containing a script tag such as `<script>alert("XSS")</script>`. If the alert executes when another user views the message details page at `/nachrichtdetail/<id>`, the vulnerability is present. Commands to test this could include using curl to send the crafted POST request: curl -X POST -d "Inhalt=<script>alert('XSS')</script>" https://[target]/SchwarzeBrett/Nachrichten/EditNachricht/<id> -H "Cookie: [auth_cookie]" [2]

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Mitigation Strategies

Immediate mitigation steps include updating the adata Mitarbeiter Portal to version 2.16.1 or later, as this version addresses the vulnerability. Additionally, restrict editing privileges on the bulletin board to trusted users only, and consider implementing input sanitization or filtering on the `Inhalt` parameter to prevent script injection until the update can be applied. [2]

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