cve-2021-29471
Vulnerability from cvelistv5
Published
2021-05-11 15:05
Modified
2024-08-03 22:11
Severity ?
EPSS score ?
0.21%
(0.58747)
Summary
Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.33.2 "Push rules" can specify conditions under which they will match, including `event_match`, which matches event content against a pattern including wildcards. Certain patterns can cause very poor performance in the matching engine, leading to a denial-of-service when processing moderate length events. The issue is patched in version 1.33.2. A potential workaround might be to prevent users from making custom push rules, by blocking such requests at a reverse-proxy.
References
Impacted products
Vendor | Product | Version | |
---|---|---|---|
▼ | matrix-org | synapse |
Version: < 1.33.2 |
|
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Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.33.2 \"Push rules\" can specify conditions under which they will match, including `event_match`, which matches event content against a pattern including wildcards. Certain patterns can cause very poor performance in the matching engine, leading to a denial-of-service when processing moderate length events. The issue is patched in version 1.33.2. A potential workaround might be to prevent users from making custom push rules, by blocking such requests at a reverse-proxy.", }, ], metrics: [ { cvssV3_1: { attackComplexity: "HIGH", attackVector: "NETWORK", availabilityImpact: "LOW", baseScore: 3.7, baseSeverity: "LOW", confidentialityImpact: "NONE", integrityImpact: "NONE", privilegesRequired: "NONE", scope: "UNCHANGED", userInteraction: "NONE", vectorString: "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", version: "3.1", }, }, ], problemTypes: [ { descriptions: [ { cweId: "CWE-400", description: "CWE-400: Uncontrolled Resource Consumption", lang: "en", type: "CWE", }, ], }, ], providerMetadata: { dateUpdated: "2021-08-02T02:06:25", orgId: "a0819718-46f1-4df5-94e2-005712e83aaa", shortName: "GitHub_M", }, references: [ { tags: [ "x_refsource_CONFIRM", ], url: "https://github.com/matrix-org/synapse/security/advisories/GHSA-x345-32rc-8h85", }, { tags: [ "x_refsource_MISC", ], url: "https://github.com/matrix-org/synapse/commit/03318a766cac9f8b053db2214d9c332a977d226c", }, { tags: [ "x_refsource_MISC", ], url: "https://github.com/matrix-org/synapse/releases/tag/v1.33.2", }, { name: "FEDORA-2021-a627cfd31e", tags: [ "vendor-advisory", "x_refsource_FEDORA", ], url: "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/", }, ], source: { advisory: "GHSA-x345-32rc-8h85", discovery: "UNKNOWN", }, title: "Denial of service in Matrix Synapse", x_legacyV4Record: { CVE_data_meta: { ASSIGNER: "security-advisories@github.com", ID: "CVE-2021-29471", STATE: "PUBLIC", TITLE: "Denial of service in Matrix Synapse", }, affects: { vendor: { vendor_data: [ { product: { product_data: [ { product_name: "synapse", version: { version_data: [ { version_value: "< 1.33.2", }, ], }, }, ], }, vendor_name: "matrix-org", }, ], }, }, data_format: "MITRE", data_type: "CVE", data_version: "4.0", description: { description_data: [ { lang: "eng", value: "Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). 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A potential workaround might be to prevent users from making custom push rules, by blocking such requests at a reverse-proxy.", }, ], }, impact: { cvss: { attackComplexity: "HIGH", attackVector: "NETWORK", availabilityImpact: "LOW", baseScore: 3.7, baseSeverity: "LOW", confidentialityImpact: "NONE", integrityImpact: "NONE", privilegesRequired: "NONE", scope: "UNCHANGED", userInteraction: "NONE", vectorString: "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", version: "3.1", }, }, problemtype: { problemtype_data: [ { description: [ { lang: "eng", value: "CWE-400: Uncontrolled Resource Consumption", }, ], }, ], }, references: { reference_data: [ { name: "https://github.com/matrix-org/synapse/security/advisories/GHSA-x345-32rc-8h85", refsource: "CONFIRM", url: "https://github.com/matrix-org/synapse/security/advisories/GHSA-x345-32rc-8h85", }, { name: "https://github.com/matrix-org/synapse/commit/03318a766cac9f8b053db2214d9c332a977d226c", refsource: "MISC", url: "https://github.com/matrix-org/synapse/commit/03318a766cac9f8b053db2214d9c332a977d226c", }, { name: "https://github.com/matrix-org/synapse/releases/tag/v1.33.2", refsource: "MISC", url: "https://github.com/matrix-org/synapse/releases/tag/v1.33.2", }, { name: "FEDORA-2021-a627cfd31e", refsource: "FEDORA", url: "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/", }, ], }, source: { advisory: "GHSA-x345-32rc-8h85", discovery: "UNKNOWN", }, }, }, }, cveMetadata: { assignerOrgId: "a0819718-46f1-4df5-94e2-005712e83aaa", assignerShortName: "GitHub_M", cveId: "CVE-2021-29471", datePublished: "2021-05-11T15:05:12", dateReserved: "2021-03-30T00:00:00", dateUpdated: "2024-08-03T22:11:05.476Z", state: "PUBLISHED", }, dataType: "CVE_RECORD", dataVersion: "5.1", "vulnerability-lookup:meta": { nvd: "{\"cve\":{\"id\":\"CVE-2021-29471\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2021-05-11T15:15:08.507\",\"lastModified\":\"2024-11-21T06:01:11.337\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.33.2 \\\"Push rules\\\" can specify conditions under which they will match, including `event_match`, which matches event content against a pattern including wildcards. Certain patterns can cause very poor performance in the matching engine, leading to a denial-of-service when processing moderate length events. The issue is patched in version 1.33.2. A potential workaround might be to prevent users from making custom push rules, by blocking such requests at a reverse-proxy.\"},{\"lang\":\"es\",\"value\":\"Synapse es un servidor doméstico de referencia de Matrix escrito en python (paquete pypi matrix-synapse). Matrix es un ecosistema para VoIP y mensajería instantánea federada abierta. En Synapse versiones anteriores a 1.33.2, unas \\\"Push rules\\\" pueden especificar condiciones bajo las cuales coincidirán, incluyendo \\\"event_match\\\", que compara el contenido del evento con un patrón que incluye comodines. Determinados patrones pueden causar un rendimiento muy deficiente en el motor de coincidencia, conllevando a una denegación de servicio cuando se procesan eventos de duración moderada. El problema está parcheado en versión 1.33.2. 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Sightings
Author | Source | Type | Date |
---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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