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.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Alpine | 3.16-community | noarch | dendrite | = 0.8.5-r3 | UNKNOWN |