GitHub Advisoryadvisory · Packagist
GHSA-pjx8-984p-7p3x FOSUserBundle Entropy is lost in the TokenGenerator
MEDIUM
Official page ↗
- Ecosystem
- Packagist
- Packages
- friendsofsymfony/user-bundle
- Severity
- Moderate
- Weaknesses
- CWE-331
- Reviewed
- 2024-05-15
Affected packages
• Packagist friendsofsymfony/user-bundle: >= 1.0.0, < 1.3.5 → fixed in 1.3.5
Description
Description
Because of the usage of base_convert which looses precision for large inputs, the entropy of tokens generated by FOSUserBundle for the email confirmation and password resetting is lost. This makes these tokens much less random than they are expected to be, and so not cryptographically safe.
Resolution
The token generation logic used in the 2.0.x branch based on base64 encoding has been backported. This changes the range of characters used in the token. Any route placeholder expected to match a token generated by FOSUserBundle must be updated to allow dashes, which are not allowed by \w in regexes. A \w+ requirement should so become [\w\-]+.
Related
Weakness · CWE (1)
- CWE-331 Insufficient Entropy weakness
References
- https://github.com/FriendsOfSymfony/FOSUserBundle/commit/b3ebfea52065e9727508f5f8e6c9f7459a1b06d8 web
- https://github.com/FriendsOfPHP/security-advisories/blob/master/friendsofsymfony/user-bundle/2014-09-04-1.yaml web
- https://github.com/FriendsOfSymfony/FOSUserBundle package
- https://symfony.com/blog/fosuserbundle-entropy-of-generated-tokens-is-lost web