Executive Summary
| Informations | |||
|---|---|---|---|
| Name | CVE-2023-38691 | First vendor Publication | 2023-08-04 |
| Vendor | Cve | Last vendor Modification | 2023-08-11 |
Security-Database Scoring CVSS v3
| Cvss vector : CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N | |||
|---|---|---|---|
| Overall CVSS Score | 6.5 | ||
| Base Score | 6.5 | Environmental Score | 6.5 |
| impact SubScore | 3.6 | Temporal Score | 6.5 |
| Exploitabality Sub Score | 2.8 | ||
| Attack Vector | Network | Attack Complexity | Low |
| Privileges Required | Low | User Interaction | None |
| Scope | Unchanged | Confidentiality Impact | High |
| Integrity Impact | None | Availability Impact | None |
| Calculate full CVSS 3.0 Vectors scores | |||
Security-Database Scoring CVSS v2
| Cvss vector : | |||
|---|---|---|---|
| Cvss Base Score | N/A | Attack Range | N/A |
| Cvss Impact Score | N/A | Attack Complexity | N/A |
| Cvss Expoit Score | N/A | Authentication | N/A |
| Calculate full CVSS 2.0 Vectors scores | |||
Detail
| 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. |
Original Source
| Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-38691 |
CWE : Common Weakness Enumeration
| % | Id | Name |
|---|---|---|
| 100 % | CWE-287 | Improper Authentication |
CPE : Common Platform Enumeration
| Type | Description | Count |
|---|---|---|
| Application | 2 |
Sources (Detail)
| Source | Url |
|---|---|
| MISC | https://github.com/matrix-org/matrix-appservice-bridge/commit/4c6723a5e7beda6... https://github.com/matrix-org/matrix-appservice-bridge/security/advisories/GH... |
Alert History
| Date | Informations |
|---|---|
| 2023-08-12 05:27:25 |
|
| 2023-08-05 00:27:18 |
|
| 2023-08-04 21:27:17 |
|
