matrix-nio up to 0.19 Room Key key exchange without entity authentication

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability was found in matrix-nio up to 0.19 and classified as critical. Affected by this issue is some unknown functionality of the component Room Key Handler. The manipulation results in key exchange without entity authentication. This vulnerability is reported as CVE-2022-39254. The attack can be launched remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in matrix-nio up to 0.19. Affected is an unknown code of the component Room Key Handler. The manipulation with an unknown input leads to a key exchange without entity authentication vulnerability. CWE is classifying the issue as CWE-322. The product performs a key exchange with an actor without verifying the identity of that actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

matrix-nio is a Python Matrix client library, designed according to sans I/O principles. Prior to version 0.20, when a users requests a room key from their devices, the software correctly remember the request. Once they receive a forwarded room key, they accept it without checking who the room key came from. This allows homeservers to try to insert room keys of questionable validity, potentially mounting an impersonation attack. Version 0.20 fixes the issue.

The weakness was disclosed 09/30/2022 as GHSA-w4pr-4vjg-hffh. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2022-39254 since 09/02/2022. There are neither technical details nor an exploit publicly available.

Upgrading to version 0.20 eliminates this vulnerability. Applying the patch b1cbf234a831daa160673defd596e6450e9c29f0 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

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CNA Base Score: 8.6
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: Key exchange without entity authentication
CWE: CWE-322 / CWE-320
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: 🔍

Upgrade: matrix-nio 0.20
Patch: b1cbf234a831daa160673defd596e6450e9c29f0

Timelineinfo

09/02/2022 🔍
09/30/2022 +28 days 🔍
09/30/2022 +0 days 🔍
10/26/2022 +26 days 🔍

Sourcesinfo

Advisory: GHSA-w4pr-4vjg-hffh
Status: Confirmed

CVE: CVE-2022-39254 (🔍)
GCVE (CVE): GCVE-0-2022-39254
GCVE (VulDB): GCVE-100-209892

Entryinfo

Created: 09/30/2022 08:35
Updated: 10/26/2022 09:13
Changes: 09/30/2022 08:35 (52), 10/26/2022 09:13 (11)
Complete: 🔍
Cache ID: 216::103

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