Description

Our engineer found security problems when testing our website. And I have tested the demo website you provided. I found that there is indeed an xss vulnerability. I hope you can check and provide a fix as soon as possible.Thanks.

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The reason for the vulnerability is that you have used blacklists in /src/MicroweberPackages/Helper/XSSClean.php for filtering, but the blacklists are not perfect.And there are still events that can be used, such as 'onbeforeinput'.

Video link

link

https://drive.google.com/file/d/1gHXwqgI_uyIlMD45OhjopLFf5Gz9LovY/view?usp=share_link

Steps

1.Login as administrator.

2.Click the 'Settings' module.

3.Click and go into section named 'E-mail' or 'General'.

4.Enter the following value in the input box of the page.

xss"onbeforeinput="alert(1)"

This vulnerability lies in module 'Settings' of the administrator interface. All contents of module 'Website settings', including 'General', 'E-mail','Advanced' have this xss vulnerability.

Impact

(1) To steal the administrator account or cookie, the intruder can log in to the background as an administrator. It enables intruders to manipulate background data maliciously, including reading, changing, adding and deleting some information.

(2) Stealing users' personal information or login accounts will pose a huge threat to the user security of the website. For example, pretend to be a user for various operations.

(3) The website hangs horses. First, embed the malicious attack code into the Web application. When the user browses the hanging horse page, the user's computer will be implanted with a Trojan horse.

(4) Send advertisements or spam messages. Attackers can use XSS vulnerabilities to plant advertisements or send spam, seriously affecting the normal use of users.