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CVE-2023-38691: matrix-appservice-bridge provides an API for setting up brid..

matrix

Aug 4, 2023

Aug 11, 2023

Medium

6.5

/

10

Description

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.

Products affected:

  • matrix» matrix-appservice-bridge » *

  • matrix» matrix-appservice-bridge » 9.0.0

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Severity

Medium

Medium

6.5

/

10

CVSS base metrics

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

LOW

User interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

NONE

Exploitability Score

2.8

Impact Score

3.6

Weakness

CWE-287__CWE-287__

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