CVE-2023-38691
CVSS V2 None
CVSS V3 None
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.
Overview
- CVE ID
- CVE-2023-38691
- Assigner
- GitHub_M
- Vulnerability Status
- PUBLISHED
- Published Version
- 2023-08-04T16:34:54.312Z
- Last Modified Date
- 2023-08-04T16:34:54.312Z
Weakness Enumerations
References
| Reference URL | Reference Tags |
|---|---|
| https://github.com/matrix-org/matrix-appservice-bridge/security/advisories/GHSA-vc7j-h8xg-fv5x | x_refsource_CONFIRM |
| https://github.com/matrix-org/matrix-appservice-bridge/commit/4c6723a5e7beda65cdf1ae5dbb882e8beaac8552 | x_refsource_MISC |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2023-38691 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-38691 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2024-06-25 21:13:03 | Added to TrackCVE |