Description
In TYPO3 CMS greater than or equal to 9.0.0 and less than 9.5.20, and greater than or equal to 10.0.0 and less than 10.4.6, it has been discovered that an internal verification mechanism can be used to generate arbitrary checksums. This allows to inject arbitrary data having a valid cryptographic message authentication code (HMAC-SHA1) and can lead to various attack chains including potential privilege escalation, insecure deserialization & remote code execution. The overall severity of this vulnerability is high based on mentioned attack chains and the requirement of having a valid backend user session (authenticated). This has been patched in versions 9.5.20 and 10.4.6.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected products
- TYPO3 / TYPO3 CMS>= 9.0.0, < 9.5.20 – >= 9.0.0, < 9.5.20
- TYPO3 / TYPO3 CMS>= 10.0.0, 10.4.6 – >= 10.0.0, 10.4.6
References
- VENDOR_ADVISORYhttps://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-m5vr-3m74-jwxp
- MISChttps://typo3.org/security/advisory/typo3-core-sa-2016-013
- MISChttps://typo3.org/security/advisory/typo3-core-sa-2020-008
- PATCHhttps://github.com/TYPO3/TYPO3.CMS/commit/85d3e70dff35a99ef53f4b561114acfa9e5c47e1