Potential Proxy Injection Vulnerabilities in ZendFramework
Summary
GHSA-mg7h-9qfx-4r83: ZendFramework Potential Proxy Injection Vulnerabilities. Affects zendframework/zendframework versions >= 2.0.0, < 2.0.5. Fixed in 2.0.5. How to fix ↓
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Background
ZendFramework is a popular open-source framework for developing web applications and services in PHP. It provides a robust set of components and tools that facilitate the creation of secure and maintainable applications. However, certain components within ZendFramework, specifically Zend\Session\Validator\RemoteAddr and Zend\View\Helper\ServerUrl, have been found to improperly handle HTTP headers when the application is deployed behind a proxy. This oversight can lead to vulnerabilities that may allow attackers to spoof proxied IP addresses or host names, compromising the integrity of the application.
Vulnerability Detail
The vulnerability arises from the incorrect parsing of HTTP headers in the Zend\Session\Validator\RemoteAddr and Zend\View\Helper\ServerUrl components. When a client is behind a proxy server, the detection of the proxy URL is flawed, potentially leading to inaccurate results in subsequent lookups. This could allow an attacker to manipulate the perceived IP address of the client, leading to unauthorized access or other malicious activities. Additionally, the ServerUrl helper generates URLs based on the proxy host without considering the actual server configuration, which can further exacerbate security issues.
How To Fix
Minimum fixed version
2.0.5
This is the first release that contains the fix.
composer require zendframework/zendframework:2.0.5Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, developers can implement custom logic to validate and sanitize the incoming HTTP headers before processing them. This may involve checking the X-Forwarded-For header and ensuring that it contains valid IP addresses. However, this is not a substitute for applying the official patch.
Conclusion
The identified proxy injection vulnerabilities in ZendFramework highlight the importance of proper handling of HTTP headers, especially in applications deployed behind proxies. By updating to the patched version and implementing recommended workarounds, developers can significantly enhance the security of their applications.
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FAQ
The CVSS score of this vulnerability is 5.9, indicating a moderate level of risk.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without any signup.
If exploited, this vulnerability could allow attackers to spoof IP addresses, potentially leading to unauthorized access, data breaches, or other malicious activities.
Yes, implementing custom validation and sanitization of HTTP headers can help mitigate the risk until you can apply the official patch.
You can find more information about ZendFramework on its official website or its GitHub repository.
References
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