Matrix Synapse before 0.33.3.1 allows remote attackers to spoof events and possibly have unspecified other impacts by leveraging improper transaction and event signature validation.
Weakness
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Synapse | Matrix | * | 0.33.3.1 (excluding) |
| Matrix-synapse | Ubuntu | bionic | * |
| Matrix-synapse | Ubuntu | cosmic | * |
| Matrix-synapse | Ubuntu | esm-apps/bionic | * |
| Matrix-synapse | Ubuntu | upstream | * |
Related Attack Patterns
References
- https://github.com/matrix-org/synapse/issues/3796#event-1833126269
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IRW7YR2H3ASUSYX4AO4KMY3FNVDNYW3P/
- https://matrix.org/blog/2018/09/06/critical-security-update-synapse-0-33-3-1/
- https://github.com/matrix-org/synapse/issues/3796#event-1833126269
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IRW7YR2H3ASUSYX4AO4KMY3FNVDNYW3P/
- https://matrix.org/blog/2018/09/06/critical-security-update-synapse-0-33-3-1/