Firewall configured with unanimous strategy was not actually unanimous in Symfony
Description ----------- On Symfony before 4.4.0, when a `Firewall` checks an access control rule (using the unanimous strategy), it iterates over all rule attributes and grant access only if *all* calls to the `accessDecisionManager` decide to grant access. As of Symfony 4.4.0, a bug was introduced that prevents the check of attributes as soon as `accessDecisionManager` decide to grant access on one attribute. Resolution ---------- The `accessDecisionManager` is now called with all attributes at once, allowing the unanimous strategy being applied on each attribute. The patch for this issue is available [here](https://github.com/symfony/symfony/commit/c935e4a3fba6cc2ab463a6ca382858068d63cebf) for the 4.4 branch. Credits ------- I would like to thank Antonio J. García Lagar for reporting & Robin Chalas for fixing the issue.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2020-5275US | high8.1OT elevated | — | ||
In symfony/security-http before versions 4.4.7 and 5.0.7, when a `Firewall` checks access control rule, it iterate overs each rule's attributes and stops as soon as the accessDecis… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2020-5275.yamlWEB
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security/CVE-2020-5275.yamlWEB
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2020-5275.yamlWEB
- https://github.com/symfony/symfony/commit/c935e4a3fba6cc2ab463a6ca382858068d63cebfWEB
- https://github.com/symfony/symfony/security/advisories/GHSA-g4m9-5hpf-hx72WEB
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/C36JLPHUPKDFAX6D5WYFC4ALO2K7RDUQWEB
- https://nvd.nist.gov/vuln/detail/CVE-2020-5275ADVISORY
- https://symfony.com/cve-2020-5275WEB
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