CVE-2022-36009

Date: August 19, 2022

gomatrixserverlib is a Go library for matrix protocol federation. Dendrite is a Matrix homeserver written in Go, an alternative to Synapse. The power level parsing within gomatrixserverlib was failing to parse the ""events_default"" key of the "m.room.power_levels" event, defaulting the event default power level to zero in all cases. Power levels are the matrix terminology for user access level. In rooms where the ""events_default"" power level had been changed, this could result in events either being incorrectly authorised or rejected by Dendrite servers. gomatrixserverlib contains a fix as of commit "723fd49" and Dendrite 0.9.3 has been updated accordingly. Matrix rooms where the ""events_default"" power level has not been changed from the default of zero are not vulnerable. Users are advised to upgrade. There are no known workarounds for this issue.

Language: Go