CVE-2015-8766: Symfony XSS Vulnerabilities
Summary
CVE-2015-8766: Symphony CMS XSS Vulnerabilities. Affects symphonycms/symphony-2 versions < 2.6.4. Fixed in 2.6.4. How to fix ↓
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Background
Symfony is a popular PHP framework used for developing web applications. It provides a set of reusable components and tools for building robust and scalable applications. The vulnerability identified as CVE-2015-8766 affects versions of Symfony CMS prior to 2.6.4. This vulnerability allows remote attackers to inject arbitrary web script or HTML through various parameters in the system preferences, potentially leading to cross-site scripting (XSS) attacks.
Vulnerability Detail
The vulnerability arises due to insufficient input sanitization in the content/content.systempreferences.php file of Symfony CMS. Specifically, the following parameters are affected: email_sendmail[from_name], email_sendmail[from_address], email_smtp[from_name], email_smtp[from_address], email_smtp[host], email_smtp[port], jit_image_manipulation[trusted_external_sites], and maintenance_mode[ip_whitelist]. An attacker can exploit these parameters to inject malicious web script or HTML, which will be executed in the context of the affected application. This can lead to various attacks, including session hijacking, defacement, or the theft of sensitive information.
How To Fix
Minimum fixed version
2.6.4
This is the first release that contains the fix.
composer require symphonycms/symphony-2:2.6.4Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If upgrading to the latest version is not immediately feasible, a temporary workaround can be implemented by manually sanitizing the affected parameters. This can be done by using appropriate input filtering and validation techniques, such as HTML entity encoding or using a dedicated HTML sanitizer library. However, it is strongly recommended to apply the official patch or upgrade to the latest version as soon as possible.
Conclusion
The CVE-2015-8766 vulnerability in Symfony CMS exposes applications to cross-site scripting (XSS) attacks. Upgrading to version 2.6.4 or later is the recommended solution, as it includes the necessary patches to mitigate this vulnerability. In the meantime, developers can implement temporary workarounds by manually sanitizing user input. It is crucial to prioritize the security of Symfony CMS installations and ensure that all user-supplied input is properly validated and sanitized to prevent XSS attacks.
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FAQ
Symfony CMS is a content management system built on top of the Symfony PHP framework. It provides a user-friendly interface for managing website content and includes various features for customization and extensibility.
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 attacks, such as session hijacking, defacement, or the theft of sensitive information.
You can use the Vulert Playground at Vulert Scanner to check if your application is affected by this vulnerability. Simply upload your composer.lock file to the playground, and it will analyze the dependencies and alert you if any vulnerabilities are found.
While specific exploits for this vulnerability have not been disclosed, it is important to address it promptly to prevent potential attacks. Attackers could leverage the vulnerability to inject malicious scripts or HTML into the affected application, potentially leading to various security breaches.
For further support and assistance in remediating this vulnerability, you can reach out to info@devnack.com. Our team of experts will be happy to help you secure your Symfony CMS installation and address any related concerns.
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