CVE-2023-38691

matrix-appservice-bridge provides an API for setting up bridges. Starting in version 4.0.0 and prior to versions 8.1.2 and 9.0.1, a malicious Matrix server can use a foreign user's MXID in an OpenID exchange, allowing a bad actor to impersonate users when using the provisioning API. The library does not check that the servername part of the `sub` parameter (containing the user's *claimed* MXID) is the the same as the servername we are talking to. A malicious actor could spin up a server on any given domain, respond with a `sub` parameter according to the user they want to act as and use the resulting token to perform provisioning requests. Versions 8.1.2 and 9.0.1 contain a patch. As a workaround, disable the provisioning API.

CVSS v3 5.0 MEDIUM

5.0^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.1 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/matrix-org/matrix-appservice-bridge/commit/4c6723a5e7beda65cdf1ae5dbb882e8beaac8552	Patch
https://github.com/matrix-org/matrix-appservice-bridge/security/advisories/GHSA-vc7j-h8xg-fv5x	Third Party Advisory
https://github.com/matrix-org/matrix-appservice-bridge/commit/4c6723a5e7beda65cdf1ae5dbb882e8beaac8552	Patch
https://github.com/matrix-org/matrix-appservice-bridge/security/advisories/GHSA-vc7j-h8xg-fv5x	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:matrix:matrix-appservice-bridge::::::node.js::*
	cpe:2.3:a:matrix:matrix-appservice-bridge:9.0.0:::::node.js::

History

No history.

Information

Published : 2023-08-04 17:15

Updated : 2024-11-21 08:14

NVD link : CVE-2023-38691

Mitre link : CVE-2023-38691

CVE.ORG link : CVE-2023-38691

JSON object : View

Products Affected

matrix

matrix-appservice-bridge

CWE

CWE-287

Improper Authentication

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