CVE-2021-39164
Vulnerability from cvelistv5
Published
2021-08-31 16:20
Modified
2024-08-04 01:58
Severity ?
EPSS score ?
Summary
Improper authorisation of /members discloses room membership to non-members
References
Impacted products
Vendor | Product | Version | |
---|---|---|---|
▼ | matrix-org | synapse |
Version: < 1.41.1 |
|
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In versions 1.41.0 and prior, unauthorised users can access the membership (list of members, with their display names) of a room if they know the ID of the room. The vulnerability is limited to rooms with `shared` history visibility. Furthermore, the unauthorised user must be using an account on a vulnerable homeserver that is in the room. Server administrators should upgrade to 1.41.1 or later in order to receive the patch. One workaround is available. Administrators of servers that use a reverse proxy could, with potentially unacceptable loss of functionality, block the endpoints: `/_matrix/client/r0/rooms/{room_id}/members` with `at` query parameter, and `/_matrix/client/unstable/rooms/{room_id}/members` with `at` query parameter." } ], "metrics": [ { "cvssV3_1": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.1, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N", "version": "3.1" } } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-200", "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "dateUpdated": "2021-09-24T22:06:12", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M" }, "references": [ { "tags": [ "x_refsource_MISC" ], "url": "https://github.com/matrix-org/synapse/commit/cb35df940a" }, { "tags": [ "x_refsource_MISC" ], "url": "https://github.com/matrix-org/synapse/releases/tag/v1.41.1" }, { "tags": [ "x_refsource_CONFIRM" ], "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-3x4c-pq33-4w3q" }, { "name": "FEDORA-2021-2e8ed15b14", "tags": [ "vendor-advisory", "x_refsource_FEDORA" ], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PXT7ID7DNBRN2TVTETU3SYQHJKEG6PXN/" }, { "name": "FEDORA-2021-f12fdca1bf", "tags": [ "vendor-advisory", "x_refsource_FEDORA" ], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2VHDEPCZ22GJFMZCWA2XZAGPOEV72POF/" } ], "source": { "advisory": "GHSA-3x4c-pq33-4w3q", "discovery": "UNKNOWN" }, "title": "Improper authorisation of /members discloses room membership to non-members", "x_legacyV4Record": { "CVE_data_meta": { "ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-39164", "STATE": "PUBLIC", "TITLE": "Improper authorisation of /members discloses room membership to non-members" }, "affects": { "vendor": { "vendor_data": [ { "product": { "product_data": [ { "product_name": "synapse", "version": { "version_data": [ { "version_value": "\u003c 1.41.1" } ] } } ] }, "vendor_name": "matrix-org" } ] } }, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "eng", "value": "Matrix is an ecosystem for open federated Instant Messaging and Voice over IP. 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Administrators of servers that use a reverse proxy could, with potentially unacceptable loss of functionality, block the endpoints: `/_matrix/client/r0/rooms/{room_id}/members` with `at` query parameter, and `/_matrix/client/unstable/rooms/{room_id}/members` with `at` query parameter." } ] }, "impact": { "cvss": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.1, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N", "version": "3.1" } }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor" } ] } ] }, "references": { "reference_data": [ { "name": "https://github.com/matrix-org/synapse/commit/cb35df940a", "refsource": "MISC", "url": "https://github.com/matrix-org/synapse/commit/cb35df940a" }, { "name": "https://github.com/matrix-org/synapse/releases/tag/v1.41.1", "refsource": "MISC", "url": "https://github.com/matrix-org/synapse/releases/tag/v1.41.1" }, { "name": "https://github.com/matrix-org/synapse/security/advisories/GHSA-3x4c-pq33-4w3q", "refsource": "CONFIRM", "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-3x4c-pq33-4w3q" }, { "name": "FEDORA-2021-2e8ed15b14", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PXT7ID7DNBRN2TVTETU3SYQHJKEG6PXN/" }, { "name": "FEDORA-2021-f12fdca1bf", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2VHDEPCZ22GJFMZCWA2XZAGPOEV72POF/" } ] }, "source": { "advisory": "GHSA-3x4c-pq33-4w3q", "discovery": "UNKNOWN" } } } }, "cveMetadata": { "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-39164", "datePublished": "2021-08-31T16:20:10", "dateReserved": "2021-08-16T00:00:00", "dateUpdated": "2024-08-04T01:58:18.118Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1", "meta": { "nvd": "{\"cve\":{\"id\":\"CVE-2021-39164\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2021-08-31T17:15:08.267\",\"lastModified\":\"2023-11-07T03:37:34.970\",\"vulnStatus\":\"Modified\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"Matrix is an ecosystem for open federated Instant Messaging and Voice over IP. 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Sightings
Author | Source | Type | Date |
---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.