Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, SymfonyComponentYamlParser::cleanup() used regular expressions with overlapping quantifiers for YAML directive, comment, and document marker cleanup, allowing crafted input to make parsing hang for an arbitrarily long time. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.
Weakness
The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Symfony | Sensiolabs | * | 5.4.52 (excluding) |
| Symfony | Sensiolabs | 6.0.0 (including) | 6.4.40 (excluding) |
| Symfony | Sensiolabs | 7.0.0 (including) | 7.4.12 (excluding) |
| Symfony | Sensiolabs | 8.0.0 (including) | 8.0.12 (excluding) |
| Symfony | Ubuntu | questing | * |
| Symfony | Ubuntu | upstream | * |
Potential Mitigations
Related Attack Patterns
References
- https://github.com/symfony/symfony/commit/9749cd43c5e09b3735093623670b21b9d8a056cb
- https://github.com/symfony/symfony/releases/tag/v5.4.52
- https://github.com/symfony/symfony/releases/tag/v6.4.40
- https://github.com/symfony/symfony/releases/tag/v7.4.12
- https://github.com/symfony/symfony/releases/tag/v8.0.12
- https://github.com/symfony/symfony/security/advisories/GHSA-9frc-8383-795m