Laravel Encrypter Component Potential Decryption Failure Leading to Unintended Behavior
Summary
GHSA-7852-w36x-6mf6: Laravel Encrypter Component Potential Decryption Failure Leading to Unintended Behavior. Affects laravel/framework across 2 version ranges.
< 5.5.40
>= 5.6.0, < 5.6.15
Fixed in 5.5.40 or 5.6.15, depending on the release line you run. How to fix ↓
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Background
The Laravel framework is a popular PHP framework used for web application development. It provides a wide range of features and components to simplify the development process. One of these components is the Laravel Encrypter, which is responsible for encrypting and decrypting data. It uses a symmetric encryption algorithm to secure sensitive information such as user credentials or session data. However, a vulnerability has been discovered in the Laravel Encrypter component that may result in decryption failure, leading to unexpected behavior in the application.
Vulnerability Detail
The vulnerability in the Laravel Encrypter component allows an attacker to manipulate the encrypted payload before decryption, leading to a potential decryption failure. This can occur when weak type comparisons are used in the application's code, allowing the attacker to bypass certain checks. For example, if the application uses a weak type comparison like 'if ($decryptedValue == '')', the code may still be executed even though the decrypted value is false. This can lead to unintended behavior and potentially allow an attacker to exploit the vulnerability for malicious purposes.
How To Fix
Fixed versions by release line
The minimum fixed version depends on the release line you run.
-
< 5.5.405.5.40composer require laravel/framework:5.5.40 -
>= 5.6.0, < 5.6.155.6.15composer require laravel/framework:5.6.15
Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →
Workaround
If updating the Laravel framework is not immediately feasible, a workaround can be implemented to mitigate the risk. One possible workaround is to use a strong type comparison instead of a weak type comparison in the application's code. For example, using 'if ($decryptedValue === false)' instead of 'if ($decryptedValue == '')' can help prevent the vulnerability from being exploited. It is important to thoroughly test the application after implementing the workaround to ensure that it does not introduce any unintended side effects.
Conclusion
The Laravel Encrypter component is susceptible to a vulnerability that may result in decryption failure and unintended behavior in the application. It is recommended to update the Laravel framework to versions 5.5.40 or 5.6.15 to patch the vulnerability. If updating is not immediately feasible, a workaround can be implemented by using a strong type comparison in the application's code. Thorough testing should be conducted after implementing the workaround to ensure that it does not introduce any unintended side effects. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to decryption failure and unintended behavior in the application. This can potentially allow an attacker to bypass certain checks and exploit the vulnerability for malicious purposes.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your application is affected by this vulnerability. Simply upload your composer.lock file and the Vulert Playground will analyze it for any open-source vulnerabilities, including this one.
Yes, the vulnerability has been fixed in Laravel versions 5.5.40 and 5.6.15. It is recommended to update the Laravel framework to one of these versions or later to ensure that the vulnerability is patched.
Yes, if updating the Laravel framework is not immediately feasible, you can implement a workaround by using a strong type comparison instead of a weak type comparison in the application's code. This can help mitigate the risk of the vulnerability being exploited.
There are currently no known exploits of this vulnerability. However, it is important to patch the vulnerability as soon as possible to prevent any potential exploitation.
References
Related vulnerabilities
Recent vulnerabilities recorded for laravel/framework.
