CVE-2020-18699: Cross Site Scripting (XSS) in lin-cms
Summary
CVE-2020-18699: Cross Site Scripting (XSS) in Lin-CMS-Flask v0.1.1 allows remote attackers to execute arbitrary code by entering scripts in the the 'Username' parameter of the in component 'app/api/cms/user.py'. Affects lin-cms versions 0.1.1a1 – 0.4.9. No fix is published. How to fix ↓
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Background
Lin-CMS is a Python package available on PyPI that provides a content management system (CMS) framework for building web applications. It is designed to be lightweight and easy to use, offering features such as user management, permission control, and content publishing. Lin-CMS-Flask is a specific version of Lin-CMS that is built using the Flask web framework. This vulnerability affects Lin-CMS-Flask version 0.1.1.
Vulnerability Detail
The vulnerability identified as CVE-2020-18699 is a Cross Site Scripting (XSS) vulnerability in Lin-CMS-Flask. It allows remote attackers to execute arbitrary code by injecting scripts into the 'Username' parameter of the 'app/api/cms/user.py' component. This means that an attacker can manipulate the input field for the 'Username' parameter to inject malicious scripts, which will then be executed by the application. This can lead to various security risks, including unauthorized access, data theft, and further exploitation of the system.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, you can implement input validation and sanitization on the server-side to prevent the execution of malicious scripts. This can be done by implementing proper input validation and sanitization functions that strip or escape any potentially dangerous characters or scripts. Here is an example of how you can sanitize the 'Username' parameter in Python:
import html
username = html.escape(username)
By using the html.escape() function, any HTML special characters will be converted to their corresponding HTML entities, preventing them from being interpreted as code.
Conclusion
In conclusion, the CVE-2020-18699 vulnerability in Lin-CMS-Flask version 0.1.1 allows for Cross Site Scripting (XSS) attacks, enabling remote attackers to execute arbitrary code. To mitigate this vulnerability, it is crucial to upgrade to a patched version of Lin-CMS-Flask and implement proper input validation and sanitization. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
Lin-CMS is a lightweight content management system (CMS) framework for building web applications. It provides features such as user management, permission control, and content publishing.
Lin-CMS-Flask is a specific version of Lin-CMS that is built using the Flask web framework.
Cross Site Scripting (XSS) is a type of security vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users. This can lead to various security risks, including unauthorized access, data theft, and further exploitation of the system.
To fix this vulnerability, you should upgrade to a version of Lin-CMS-Flask that includes a patch for this issue. Additionally, you should implement proper input validation and sanitization to prevent the execution of malicious scripts.
As a temporary workaround, you can implement input validation and sanitization on the server-side to prevent the execution of malicious scripts. This can be done by stripping or escaping any potentially dangerous characters or scripts from user input.
References
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