CVE-2015-2171: Slim vulnerable to PHP object injection
Summary
CVE-2015-2171: Slim vulnerable to PHP object injection. Affects slim/slim versions < 2.6.0. Fixed in 2.6.0. How to fix ↓
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Background
Slim is a PHP micro-framework that helps developers quickly build web applications and APIs. It provides a simple and elegant way to handle HTTP requests and responses. However, versions before 2.6.0 of Slim are vulnerable to PHP object injection attacks through crafted session data in the Middleware/SessionCookie.php file.
Vulnerability Detail
The vulnerability in Slim allows remote attackers to exploit PHP object injection and execute arbitrary PHP code. By manipulating session data, an attacker can inject malicious objects into the application, potentially leading to unauthorized access, data leakage, or remote code execution. This vulnerability has a high severity rating and is classified under CWE-94.
How To Fix
Minimum fixed version
2.6.0
This is the first release that contains the fix.
composer require slim/slim:2.6.0Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If upgrading to the latest version of Slim is not immediately feasible, developers can implement a workaround by manually validating and sanitizing session data before using it. This involves checking the integrity and authenticity of the session data and ensuring that it does not contain any unexpected or malicious objects. Here is an example of how to sanitize session data in PHP:
function sanitizeSessionData($data) {
// Perform validation and sanitization
// Example code: remove any objects from the session data
foreach ($data as $key => $value) {
if (is_object($value)) {
unset($data[$key]);
}
}
return $data;
}
By implementing this workaround, developers can reduce the risk of PHP object injection until they are able to upgrade to a secure version of Slim.
Conclusion
The vulnerability in Slim versions prior to 2.6.0 allows for PHP object injection attacks, which can lead to unauthorized access, data leakage, or remote code execution. To mitigate this vulnerability, it is recommended to upgrade to Slim 2.6.0 or later. Alternatively, developers can implement a workaround by manually validating and sanitizing session data. Stay informed about vulnerabilities in your software by using Vulert, a tool that monitors and alerts in real-time for open-source vulnerabilities.
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FAQ
PHP object injection is a vulnerability that occurs when untrusted user input is deserialized and used to create PHP objects. Attackers can exploit this vulnerability to inject malicious objects into an application, leading to various security risks.
If your application uses a vulnerable version of Slim, it is susceptible to PHP object injection attacks. This can result in unauthorized access, data leakage, or remote code execution, depending on how the injected objects are utilized.
While specific exploits for this vulnerability may exist, they have not been disclosed in the provided information. However, it is crucial to address this vulnerability promptly to prevent potential exploitation.
No specific incidents related to this vulnerability have been mentioned in the provided information. However, it is important to stay vigilant and apply the necessary security patches to mitigate the risk.
For more information about the Slim vulnerability, you can refer to the official GitHub advisory database. Additionally, you can reach out to info@devnack.com for further support on vulnerability remediation.
References
Related vulnerabilities
Recent vulnerabilities recorded for slim/slim.
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