gomatrixserverlib/Dendrite m.room.power_levels events_default authorization

CVSS Meta Temp Score
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CTI Interest Score
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4.9$0-$5k0.00

Summaryinfo

A vulnerability was found in gomatrixserverlib and Dendrite and classified as problematic. Affected is the function m.room.power_levels. Executing a manipulation of the argument events_default can lead to authorization. The identification of this vulnerability is CVE-2022-36009. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in gomatrixserverlib and Dendrite (the affected version is unknown). It has been declared as problematic. This vulnerability affects the function m.room.power_levels. The manipulation of the argument events_default with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was shared 08/20/2022 as GHSA-grvv-h2f9-7v9c. The advisory is available at github.com. This vulnerability was named CVE-2022-36009 since 07/15/2022. Technical details are known, but there is no available exploit.

Upgrading eliminates this vulnerability. Applying the patch 723fd495dde835d078b9f2074b6b62c06dea4575 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 4.9

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 5.0
CNA Vector (GitHub, Inc.): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Authorization
CWE: CWE-863 / CWE-285 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Patch: 723fd495dde835d078b9f2074b6b62c06dea4575

Timelineinfo

07/15/2022 🔍
08/20/2022 +36 days 🔍
08/20/2022 +0 days 🔍
08/20/2022 +0 days 🔍

Sourcesinfo

Advisory: GHSA-grvv-h2f9-7v9c
Status: Confirmed

CVE: CVE-2022-36009 (🔍)
GCVE (CVE): GCVE-0-2022-36009
GCVE (VulDB): GCVE-100-206854

Entryinfo

Created: 08/20/2022 09:00
Changes: 08/20/2022 09:00 (50)
Complete: 🔍
Cache ID: 216::103

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