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CVE-2022-36009

Incorrect parsing of access level in gomatrixserverlib and dendrite

Published: Aug 19, 2022Updated: Nov 21, 2024 Sources: CVE List NVD GHSACWE-863
NVD MITRE
5.0CVSSMEDIUM
EPSS Score
0.7%
Top 53.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-863

Affected Products

dendritematrix
Mixed
Communications / messaging-chat
gomatrixserverlibmatrix
Mixed
Communications / messaging-chat
gomatrixserverlibmatrix-org
Mixed
Communications / messaging-chat
github.com/matrix-org/dendriteGoOSS Libraries
github.com/matrix-org/gomatrixserverlibGoOSS Libraries
matrixoss-projectGBCommunicationsaka synapse, matrix irc bridge, javascript sdk
matrix-orgoss-projectDECommunicationsaka synapse, matrix-js-sdk, matrix appservice irc
gopackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
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References

https://github.com/matrix-org/gomatrixserverlib/commit/723fd495dde835d078b9f2074b6b62c06dea4575
github.com
https://github.com/matrix-org/gomatrixserverlib/security/advisories/GHSA-grvv-h2f9-7v9c
github.com
https://matrix.org/docs/guides/moderation/#power-levels
matrix.org
and 3 more references View all →

Timeline

Published
Aug 19, 2022
Last Updated
Nov 21, 2024

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