CVE-2014-4931: Code Injection in Symfony FrameworkBundle Translation Caching
Summary
CVE-2014-4931: Code injection in the way Symfony implements translation caching in FrameworkBundle. Affects symfony/framework-bundle across 3 version ranges.
>= 2.0.0, < 2.3.18
>= 2.4.0, < 2.4.8
>= 2.5.0, < 2.5.2
Fixed in 2.3.18, 2.4.8 or 2.5.2, depending on the release line you run. How to fix ↓
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Background
Symfony FrameworkBundle is a component of the Symfony full-stack framework that provides a set of tools and libraries for building web applications. It includes the Symfony translation system, which allows developers to manage and translate messages in different languages. However, a vulnerability in the translation caching mechanism of FrameworkBundle allows for code injection, potentially leading to remote code execution.
Vulnerability Detail
The vulnerability arises when Symfony FrameworkBundle is used in conjunction with the translation system and unvalidated locales are accepted from a URL parameter. Attackers can exploit this by submitting a non-valid locale value that contains PHP code. This code is then executed by Symfony when generating a PHP file in the cache, without proper sanitization. As a result, an attacker can execute arbitrary code on the server.
How To Fix
Fixed versions by release line
The minimum fixed version depends on the release line you run.
-
>= 2.0.0, < 2.3.182.3.18composer require symfony/framework-bundle:2.3.18 -
>= 2.4.0, < 2.4.82.4.8composer require symfony/framework-bundle:2.4.8 -
>= 2.5.0, < 2.5.22.5.2composer require symfony/framework-bundle:2.5.2
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Workaround
A temporary workaround for this vulnerability is to manually sanitize and validate the locales received from the URL parameter before using them in the translation system. This can be done by implementing custom validation logic or using a library that provides input validation functions. Here is an example of how to sanitize the locale parameter in PHP:
$locale = $_GET['_locale'];
$allowedLocales = ['en', 'fr', 'de'];
if (!in_array($locale, $allowedLocales)) {
// Handle invalid locale
}
Conclusion
The code injection vulnerability in Symfony FrameworkBundle's translation caching mechanism can lead to remote code execution. It is crucial to upgrade to the fixed versions of Symfony FrameworkBundle and implement proper input validation to mitigate the risk. For further assistance and support in vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for symfony/framework-bundle →
FAQ
Symfony FrameworkBundle is a component of the Symfony full-stack framework that provides a set of tools and libraries for building web applications. It includes various features such as routing, templating, and the translation system.
The vulnerability occurs when unvalidated locales are accepted from a URL parameter. Attackers can submit a non-valid locale value containing PHP code, which is then executed by Symfony when generating a PHP file in the cache. This allows for arbitrary code execution.
The vulnerability can lead to remote code execution, allowing attackers to execute arbitrary code on the server. This can result in unauthorized access, data breaches, and further compromise of the affected system.
To fix the vulnerability, it is recommended to upgrade to a fixed version of Symfony FrameworkBundle. Refer to the 'how_to_fix' section for the specific versions that address the issue. Additionally, ensure that all user-supplied input, such as locales, is properly sanitized and validated to prevent code injection attacks.
Yes, a temporary workaround is to manually sanitize and validate the locales received from the URL parameter before using them in the translation system. Refer to the 'workaround' section for an example of how to sanitize the locale parameter in PHP.
References
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