CVE-2023-43796— Synapse vulnerable to leak of remote user device information
Quick assessment
Affected
matrix-org synapse
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Matrix Synapse是英国Matrix基金会的一款矩阵管理服务器的实现。 Matrix Synapse 1.95.1之前、1.96.0rc1之前版本存在信息泄露漏洞，该漏洞源于可以从Synapse查询远程用户缓存的设备信息，这可用于枚举用户。
Possible ATT&CK Techniques 1 AI
T1592.004 · Client Configurations
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I. Basic Information for CVE-2023-43796
Vulnerability Information
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Vulnerability Title
Synapse vulnerable to leak of remote user device information
Source: CVE Program / CVE List V5
Vulnerability Description
Synapse is an open-source Matrix homeserver Prior to versions 1.95.1 and 1.96.0rc1, cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver. System administrators are encouraged to upgrade to Synapse 1.95.1 or 1.96.0rc1 to receive a patch. As a workaround, the `federation_domain_whitelist` can be used to limit federation traffic with a homeserver.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Matrix Synapse 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Matrix Synapse是英国Matrix基金会的一款矩阵管理服务器的实现。 Matrix Synapse 1.95.1之前、1.96.0rc1之前版本存在信息泄露漏洞，该漏洞源于可以从Synapse查询远程用户缓存的设备信息，这可用于枚举用户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| matrix-org | synapse | < 1.95.1 | - |
|
II. Public POCs for CVE-2023-43796
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2023-43796 (1)
Vendor Advisories for CVE-2023-43796 (2)
-
https://github.com/matrix-org/synapse/security/advisories/GHSA-mp92-3jfm-3575 x_refsource_CONFIRM
Mailing List Discussions for CVE-2023-43796 (2)
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Same weakness: CWE-200
V. Comments for CVE-2023-43796
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