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CVE-2022-36009— Incorrect parsing of access level in gomatrixserverlib and dendrite

Quick assessment

Affected
matrix-org gomatrixserverlib
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

gomatrixserverlib是matrix.org开源的一个 Go 库。用于矩阵服务器所需的常用功能。 gomatrixserverlib存在安全漏洞，该漏洞源于其电源等级解析程序无法解析“m.room.power_leavels事件”的“events_default”关键字导致在所有情况下会将默认电源等级设置为0。

CVSS 5.0 · Medium EPSS 0.82% · P56

Possible ATT&CK Techniques 1 AI

T1548.003 · Sudo and Sudo Caching
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I. Basic Information for CVE-2022-36009

Vulnerability Information
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Vulnerability Title
Incorrect parsing of access level in gomatrixserverlib and dendrite
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
gomatrixserverlib 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
gomatrixserverlib是matrix.org开源的一个 Go 库。用于矩阵服务器所需的常用功能。 gomatrixserverlib存在安全漏洞，该漏洞源于其电源等级解析程序无法解析“m.room.power_leavels事件”的“events_default”关键字导致在所有情况下会将默认电源等级设置为0。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
matrix-org gomatrixserverlib < 0.9.3 for dendrite -

II. Public POCs for CVE-2022-36009

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III. Intelligence Information for CVE-2022-36009

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Patches & Fixes for CVE-2022-36009 (1)

Vendor Advisories for CVE-2022-36009 (1)

Other References for CVE-2022-36009 (1)

IV. Related Vulnerabilities

Same product: gomatrixserverlib
Same vendor: matrix-org
Same weakness: CWE-863

V. Comments for CVE-2022-36009

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