CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
60.7%
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.
Vendor | Product | Version | CPE |
---|---|---|---|
matrix | dendrite | * | cpe:2.3:a:matrix:dendrite:*:*:*:*:*:*:*:* |
matrix | gomatrixserverlib | - | cpe:2.3:a:matrix:gomatrixserverlib:-:*:*:*:*:*:*:* |