CVE-2021-29002: Plone XSS Vulnerability
Summary
CVE-2021-29002: Plone XSS Vulnerability. Affects plone versions < 5.2.3. No fix is published. How to fix ↓
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Background
Plone is a content management system (CMS) written in Python and based on the Zope application server. It provides an intuitive interface for managing websites and supports various features such as content editing, user management, and site customization. Plone CMS version 5.2.3 is affected by a stored cross-site scripting (XSS) vulnerability. This vulnerability can be exploited through the site-controlpanel by manipulating the form.widgets.site_title parameter.
Vulnerability Detail
The stored XSS vulnerability in Plone CMS 5.2.3 allows an attacker to inject malicious scripts or HTML code into the site's title, which is then stored and displayed to users. When unsuspecting users view the affected page, the injected code is executed in their browsers, potentially leading to unauthorized actions, data theft, or further compromise of the system. This vulnerability has a moderate severity rating (CWE-79) and was identified through a GitHub security advisory.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can sanitize the input for the site title field to prevent the execution of any injected scripts or HTML. This can be achieved by implementing input validation and filtering mechanisms that remove or encode any potentially malicious content. Here is an example of how to sanitize the site title using Python and the bleach library:
import bleach
def sanitize_site_title(site_title):
return bleach.clean(site_title)
By applying this workaround, the risk of XSS attacks can be reduced until the Plone CMS installation is updated.
Conclusion
The Plone CMS version 5.2.3 is affected by a stored XSS vulnerability that allows attackers to inject malicious scripts or HTML code into the site's title. This can lead to unauthorized actions, data theft, or further compromise of the system. It is crucial to upgrade to a patched version of Plone CMS or apply the recommended workarounds to mitigate the risk. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
Plone CMS is a Python-based content management system that provides an intuitive interface for managing websites and supports various features such as content editing, user management, and site customization.
A stored XSS vulnerability allows an attacker to inject malicious scripts or HTML code into a web application, which is then stored and displayed to users. When unsuspecting users view the affected page, the injected code is executed in their browsers, potentially leading to unauthorized actions, data theft, or further compromise of the system.
This vulnerability in Plone CMS can be exploited by manipulating the form.widgets.site_title parameter in the site-controlpanel. An attacker can inject malicious scripts or HTML code into the site's title, which is then stored and displayed to users.
This vulnerability has a moderate severity rating (CWE-79), indicating a potential impact on the confidentiality, integrity, and availability of the affected system. It is important to apply the recommended fixes or workarounds to mitigate the risk of exploitation.
To fix this vulnerability, it is recommended to upgrade the Plone CMS installation to a version beyond 5.2.3. The developers have released a fix for this issue in a subsequent version. By updating to the latest version, the vulnerability can be mitigated.
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