CVE-2023-38691 (GCVE-0-2023-38691)
Vulnerability from cvelistv5
Published
2023-08-04 16:34
Modified
2024-10-07 13:01
Severity ?
5.0 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
CWE
  • CWE-287 - Improper Authentication
Summary
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.
References
security-advisories@github.comhttps://github.com/matrix-org/matrix-appservice-bridge/commit/4c6723a5e7beda65cdf1ae5dbb882e8beaac8552Patch
security-advisories@github.comhttps://github.com/matrix-org/matrix-appservice-bridge/security/advisories/GHSA-vc7j-h8xg-fv5xThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-appservice-bridge/commit/4c6723a5e7beda65cdf1ae5dbb882e8beaac8552Patch
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-appservice-bridge/security/advisories/GHSA-vc7j-h8xg-fv5xThird Party Advisory
Impacted products
Vendor Product Version
matrix-org matrix-appservice-bridge Version: >= 4.0.0, < 8.1.2
Version: = 9.0.0
 Create a notification for this product.
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