In Symfony before 2.8.50, 3.x before 3.4.26, 4.x before 4.1.12, and 4.2.x before 4.2.7, it is possible to cache objects that may contain bad user input. On serialization or unserialization, this could result in the deletion of files that the current user has access to. This is related to symfony/cache and symfony/phpunit-bridge.
Weakness
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Symfony | Sensiolabs | 2.8.0 (including) | 2.8.50 (excluding) |
| Symfony | Sensiolabs | 3.4.0 (including) | 3.4.26 (excluding) |
| Symfony | Sensiolabs | 4.1.0 (including) | 4.1.12 (excluding) |
| Symfony | Sensiolabs | 4.2.0 (including) | 4.2.7 (excluding) |
| Symfony | Ubuntu | bionic | * |
| Symfony | Ubuntu | cosmic | * |
| Symfony | Ubuntu | disco | * |
| Symfony | Ubuntu | esm-apps/bionic | * |
| Symfony | Ubuntu | upstream | * |
Potential Mitigations
- Make fields transient to protect them from deserialization.
- An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.
Related Attack Patterns
References
- https://github.com/symfony/symfony/commit/4fb975281634b8d49ebf013af9e502e67c28816b
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42UEKSLKJB72P24JBWVN6AADHLMYSUQD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6QEAOZXVNDA63537A2OIH4QE77EKZR5O/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BAC2TQVEEH5FDJSSWPM2BCRIPTCOEMMO/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BHHIG4GMSGEIDT3RITSW7GJ5NT6IBHXU/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LFARAUAWZE4UDSKVDWRD35D75HI5UGSD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MDSM576XIOVXVCMHNJHLBBZBTOD62LDA/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RTJGZJLPG5FHKFH7KNAKNTWOGBB6LXAL/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLOZX5BZMQKWG7PJRQL6MB5CAMKBQAWD/
- https://seclists.org/bugtraq/2019/May/21
- https://symfony.com/blog/cve-2019-10912-prevent-destructors-with-side-effects-from-being-unserialized
- https://typo3.org/security/advisory/typo3-core-sa-2019-016/
- https://www.debian.org/security/2019/dsa-4441
- https://github.com/symfony/symfony/commit/4fb975281634b8d49ebf013af9e502e67c28816b
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42UEKSLKJB72P24JBWVN6AADHLMYSUQD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6QEAOZXVNDA63537A2OIH4QE77EKZR5O/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BAC2TQVEEH5FDJSSWPM2BCRIPTCOEMMO/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BHHIG4GMSGEIDT3RITSW7GJ5NT6IBHXU/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LFARAUAWZE4UDSKVDWRD35D75HI5UGSD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MDSM576XIOVXVCMHNJHLBBZBTOD62LDA/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RTJGZJLPG5FHKFH7KNAKNTWOGBB6LXAL/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLOZX5BZMQKWG7PJRQL6MB5CAMKBQAWD/
- https://seclists.org/bugtraq/2019/May/21
- https://symfony.com/blog/cve-2019-10912-prevent-destructors-with-side-effects-from-being-unserialized
- https://typo3.org/security/advisory/typo3-core-sa-2019-016/
- https://www.debian.org/security/2019/dsa-4441