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CVE-2021-39163— Adding a private/unlisted room to a community exposes room metadata in an unauthorised manner.

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是一个雄心勃勃的新生态系统，用于开放联合即时消息和 VoIP。 Matrix 1.41.0及之前版本存在信息泄露漏洞，未经授权的用户如果知道房间的ID，就可以访问房间的名称、头像、主题和成员数量。

CVSS 3.1 · Low EPSS 0.90% · P59

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2021-39163

Vulnerability Information
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Vulnerability Title
Adding a private/unlisted room to a community exposes room metadata in an unauthorised manner.
Source: CVE Program / CVE List V5
Vulnerability Description
Matrix is an ecosystem for open federated Instant Messaging and Voice over IP. In versions 1.41.0 and prior, unauthorised users can access the name, avatar, topic and number of members of a room if they know the ID of the room. This vulnerability is limited to homeservers where the vulnerable homeserver is in the room and untrusted users are permitted to create groups (communities). By default, only homeserver administrators can create groups. However, homeserver administrators can already access this information in the database or using the admin API. As a result, only homeservers where the configuration setting `enable_group_creation` has been set to `true` are impacted. Server administrators should upgrade to 1.41.1 or higher to patch the vulnerability. There are two potential workarounds. Server administrators can set `enable_group_creation` to `false` in their homeserver configuration (this is the default value) to prevent creation of groups by non-administrators. Administrators that are using a reverse proxy could, with partial loss of group functionality, block the endpoints `/_matrix/client/r0/groups/{group_id}/rooms` and `/_matrix/client/unstable/groups/{group_id}/rooms`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/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 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Matrix是一个雄心勃勃的新生态系统，用于开放联合即时消息和 VoIP。 Matrix 1.41.0及之前版本存在信息泄露漏洞，未经授权的用户如果知道房间的ID，就可以访问房间的名称、头像、主题和成员数量。
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 < 1.41.1 -

II. Public POCs for CVE-2021-39163

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III. Intelligence Information for CVE-2021-39163

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Patches & Fixes for CVE-2021-39163 (1)

Vendor Advisories for CVE-2021-39163 (1)

Mailing List Discussions for CVE-2021-39163 (2)

Other References for CVE-2021-39163 (1)

IV. Related Vulnerabilities

Same product: synapse
Same vendor: matrix-org
Same weakness: CWE-200

V. Comments for CVE-2021-39163

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