Can you explain this vulnerability to me?

CVE-2024-51423 is a Reflected Cross-Site Scripting (XSS) vulnerability in Infor Global HR versions v11.23.03.00.21 and earlier. It occurs because the application does not properly sanitize user input in the {class} parameter of the URL path /soap/classes/{class}/lists/_generic. When an invalid class value is provided, the server generates an error message that reflects this input without encoding or sanitization, allowing attackers to inject and execute arbitrary HTML or JavaScript code in the victim's browser. Exploitation requires the attacker to deliver a malicious URL to an authenticated user, who then triggers the script execution by accessing the URL. [1]

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How can this vulnerability impact me? :

This vulnerability can allow attackers to execute arbitrary scripts in the context of an authenticated user's browser. This can lead to manipulation of the user interface, theft of sensitive data such as session tokens or credentials, redirection to malicious websites, and potentially further compromise of the user's account or system. Since exploitation requires authentication, the attacker typically uses phishing or social engineering to trick users into clicking malicious links. [1]

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How can this vulnerability be detected on my network or system? Can you suggest some commands?

This vulnerability can be detected by testing the URL endpoint `/soap/classes/{class}/lists/_generic` with various payloads injected into the `{class}` parameter to see if the input is reflected unsanitized in the error message. For example, you can use curl or a browser to send requests with payloads like `<img src=a onerror=alert(1)>` URL-encoded as `%3cimg%20src%3da%20onerror%3dalert(1)%3e` in place of `{class}`. Detection requires authentication, so ensure you are authenticated before testing. A sample curl command might be: `curl -b cookies.txt 'https://target/soap/classes/%3cimg%20src%3da%20onerror%3dalert(1)%3e/lists/_generic'` where `cookies.txt` contains valid session cookies. Observing a JavaScript alert or reflected payload in the response indicates the vulnerability. [1]

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What immediate steps should I take to mitigate this vulnerability?

Immediate mitigation steps include restricting access to the vulnerable endpoint to only trusted users, ensuring users are aware not to click on suspicious links, and applying any available patches or updates from Infor that address this XSS vulnerability. Additionally, implement input validation and output encoding on the `{class}` parameter to prevent injection of malicious scripts. If patching is not immediately possible, consider using web application firewalls (WAF) to detect and block malicious payloads targeting this parameter. [1]

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