Detection Guidance

You can detect this vulnerability by checking for the presence of uploaded PDF files with potential XSS payloads on the /systemConfig/upload endpoint. Specifically, look for PDF files accessible via static URLs that may contain embedded scripts. Commands to help detect this include using curl or wget to fetch PDF files from the upload endpoint and inspecting their content for suspicious scripts. For example, you can use: curl -s http://yourserver/systemConfig/upload/filename.pdf | strings | grep -i script. Additionally, scanning your web server logs for POST requests to /systemConfig/upload with .pdf files can help identify potential exploit attempts. [1]

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Mitigation Strategies

The immediate mitigation steps are to remove support for uploading PDF files entirely, as the application does not require this functionality. Additionally, implement validation mechanisms to detect and block malicious payloads within uploaded files to prevent XSS attacks. Restrict or disable the /systemConfig/upload endpoint from accepting PDF files and ensure that uploaded files are properly sanitized and validated before being stored or served. [1]

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Executive Summary

This vulnerability is a stored Cross-Site Scripting (XSS) issue in jshERP versions 3.5 and earlier. Attackers can upload PDF files that contain malicious XSS payloads. These PDF files are then accessible via static URLs to all users, potentially allowing the malicious script to execute in the context of users' browsers.

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Impact Analysis

The vulnerability can lead to attackers executing malicious scripts in the browsers of users who access the affected PDF files. This can result in theft of sensitive information, session hijacking, or other malicious actions performed on behalf of the user.

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