Headline
GHSA-5h5v-m596-r6rf: TYPO3 Possible Insecure Deserialization in Extbase Request Handling
It has been discovered that request handling in Extbase can be vulnerable to insecure deserialization. User submitted payload has to be signed with a corresponding HMAC-SHA1 using the sensitive TYPO3 encryptionKey as secret - invalid or unsigned payload is not deserialized.
However, since sensitive information could have been leaked by accident (e.g. in repositories or in commonly known and unprotected backup files), there is the possibility that attackers know the private encryptionKey and are able to calculate the required HMAC-SHA1 to allow a malicious payload to be deserialized.
Requirements for successfully exploiting this vulnerability (all of the following):
- rendering at least one Extbase plugin in the frontend
- encryptionKey has been leaked (from LocalConfiguration.php or corresponding .env file)
- GitHub Advisory Database
- GitHub Reviewed
- GHSA-5h5v-m596-r6rf
TYPO3 Possible Insecure Deserialization in Extbase Request Handling
High severity GitHub Reviewed Published May 30, 2024 to the GitHub Advisory Database • Updated May 30, 2024
Package
composer typo3/cms-core (Composer)
Affected versions
>= 8.0.0, < 8.7.30
>= 9.0.0, < 9.5.12
Patched versions
8.7.30
9.5.12
It has been discovered that request handling in Extbase can be vulnerable to insecure deserialization. User submitted payload has to be signed with a corresponding HMAC-SHA1 using the sensitive TYPO3 encryptionKey as secret - invalid or unsigned payload is not deserialized.
However, since sensitive information could have been leaked by accident (e.g. in repositories or in commonly known and unprotected backup files), there is the possibility that attackers know the private encryptionKey and are able to calculate the required HMAC-SHA1 to allow a malicious payload to be deserialized.
Requirements for successfully exploiting this vulnerability (all of the following):
- rendering at least one Extbase plugin in the frontend
- encryptionKey has been leaked (from LocalConfiguration.php or corresponding .env file)
References
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/2019-12-17-7.yaml
- https://typo3.org/security/advisory/typo3-psa-2019-011
Published to the GitHub Advisory Database
May 30, 2024
Last updated
May 30, 2024