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GHSA-pfw4-xjgm-267c
No affected components available
Impact
Events retrieved from a remote homeserver using /get_missing_events did not have their signatures verified correctly. This could potentially allow a remote homeserver to provide invalid/modified events to Dendrite via this endpoint.
Note that this does not apply to events retrieved through other endpoints (e.g. /event, /state) as they have been correctly verified.
Homeservers that have federation disabled are not vulnerable.
Patches
The problem has been fixed in Dendrite 0.9.8.
Workarounds
There are no workarounds.
Special thanks
Tulir Asokan, who spotted the issue originally.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data. There is a low impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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