FOSUserBundle TokenGenerator Entropy Loss
Summary
GHSA-pjx8-984p-7p3x: FOSUserBundle Entropy is lost in the TokenGenerator. Affects friendsofsymfony/user-bundle versions >= 1.0.0, < 1.3.5. Fixed in 1.3.5. How to fix ↓
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Background
FOSUserBundle is a popular user management bundle for Symfony applications. It provides functionality for user registration, login, and password management. The TokenGenerator component is responsible for generating tokens used for email confirmation and password resetting. However, due to the usage of base_convert, the generated tokens lose entropy and are not cryptographically safe.
Vulnerability Detail
The vulnerability in FOSUserBundle's TokenGenerator arises from the imprecise nature of base_convert for large inputs. This results in the loss of entropy in the generated tokens, making them less random and potentially vulnerable to brute-force attacks. Attackers may be able to guess or predict these tokens, compromising the security of email confirmation and password resetting processes.
How To Fix
Minimum fixed version
1.3.5
This is the first release that contains the fix.
composer require friendsofsymfony/user-bundle:1.3.5Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no specific workaround mentioned for this vulnerability. The recommended solution is to apply the fix provided in the 'how_to_fix' section.
Conclusion
The FOSUserBundle TokenGenerator vulnerability can lead to compromised security in email confirmation and password resetting processes. It is crucial to apply the recommended fix and update affected routes to ensure the generation of cryptographically safe tokens. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
FOSUserBundle is a user management bundle for Symfony applications, providing features like user registration, login, and password management.
The TokenGenerator component in FOSUserBundle is responsible for generating tokens used for email confirmation and password resetting.
The entropy of tokens determines their randomness and security. Higher entropy means it is harder for attackers to guess or predict the tokens.
The loss of entropy in the generated tokens makes them more susceptible to brute-force attacks. Attackers may be able to guess or predict these tokens, compromising the security of email confirmation and password resetting processes.
To fix this vulnerability, you should update your FOSUserBundle to the latest version that includes the token generation fix. Additionally, make sure any route placeholders expected to match the generated tokens allow dashes as well.
References
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