fkie_cve-2021-32778
Vulnerability from fkie_nvd
Published
2021-08-24 21:15
Modified
2024-11-21 06:07
Severity ?
5.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions envoy’s procedure for resetting a HTTP/2 stream has O(N^2) complexity, leading to high CPU utilization when a large number of streams are reset. Deployments are susceptible to Denial of Service when Envoy is configured with high limit on H/2 concurrent streams. An attacker wishing to exploit this vulnerability would require a client opening and closing a large number of H/2 streams. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to reduce time complexity of resetting HTTP/2 streams. As a workaround users may limit the number of simultaneous HTTP/2 dreams for upstream and downstream peers to a low number, i.e. 100.
References
▶ | URL | Tags | |
---|---|---|---|
security-advisories@github.com | https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc | Third Party Advisory | |
security-advisories@github.com | https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history | Release Notes, Vendor Advisory | |
af854a3a-2127-422b-91ae-364da2661108 | https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc | Third Party Advisory | |
af854a3a-2127-422b-91ae-364da2661108 | https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history | Release Notes, Vendor Advisory |
Impacted products
Vendor | Product | Version | |
---|---|---|---|
envoyproxy | envoy | * | |
envoyproxy | envoy | * | |
envoyproxy | envoy | * | |
envoyproxy | envoy | 1.19.0 |
{ "configurations": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "matchCriteriaId": "AFC3BF7F-5B28-4765-8C6F-E2437A4B425D", "versionEndExcluding": "1.16.5", "versionStartIncluding": "1.16.0", "vulnerable": true }, { "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "matchCriteriaId": "83547329-1394-417F-93DB-70C1A9D173B0", "versionEndExcluding": "1.17.4", "versionStartIncluding": "1.17.0", "vulnerable": true }, { "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "matchCriteriaId": "D7376E28-9915-4CA1-A5DB-40874D10E781", "versionEndExcluding": "1.18.4", "versionStartIncluding": "1.18.0", "vulnerable": true }, { "criteria": "cpe:2.3:a:envoyproxy:envoy:1.19.0:*:*:*:*:*:*:*", "matchCriteriaId": "1968AA35-60E2-4A00-84A0-617738B55D33", "vulnerable": true } ], "negate": false, "operator": "OR" } ] } ], "cveTags": [], "descriptions": [ { "lang": "en", "value": "Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions envoy\u2019s procedure for resetting a HTTP/2 stream has O(N^2) complexity, leading to high CPU utilization when a large number of streams are reset. Deployments are susceptible to Denial of Service when Envoy is configured with high limit on H/2 concurrent streams. An attacker wishing to exploit this vulnerability would require a client opening and closing a large number of H/2 streams. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to reduce time complexity of resetting HTTP/2 streams. As a workaround users may limit the number of simultaneous HTTP/2 dreams for upstream and downstream peers to a low number, i.e. 100." }, { "lang": "es", "value": "Envoy es un proxy L7 de c\u00f3digo abierto y un bus de comunicaci\u00f3n dise\u00f1ado para grandes arquitecturas modernas orientadas a servicios. En las versiones afectadas, el procedimiento de Envoy para restablecer un flujo HTTP/2 presenta una complejidad O(N^2), conllevando a un alto uso de la CPU cuando se restablece un gran n\u00famero de flujos. Los despliegues son susceptibles a una Denegaci\u00f3n de Servicio cuando Envoy est\u00e1 configurado con un alto l\u00edmite de flujos concurrentes H/2. Un atacante que desee explotar esta vulnerabilidad necesitar\u00eda un cliente que abriera y cerrara un gran n\u00famero de flujos H/2. Envoy versiones 1.19.1, 1.18.4, 1.17.4 y 1.16.5, contienen correcciones para reducir la complejidad del tiempo de restablecimiento de los flujos HTTP/2. Como soluci\u00f3n, los usuarios pueden limitar el n\u00famero de sue\u00f1os HTTP/2 simult\u00e1neos para los pares ascendentes y descendentes a un n\u00famero bajo, es decir, 100." } ], "id": "CVE-2021-32778", "lastModified": "2024-11-21T06:07:43.340", "metrics": { "cvssMetricV2": [ { "acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": { "accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0" }, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false } ], "cvssMetricV31": [ { "cvssData": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L", "version": "3.1" }, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary" }, { "cvssData": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary" } ] }, "published": "2021-08-24T21:15:09.553", "references": [ { "source": "security-advisories@github.com", "tags": [ "Third Party Advisory" ], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc" }, { "source": "security-advisories@github.com", "tags": [ "Release Notes", "Vendor Advisory" ], "url": "https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": [ "Third Party Advisory" ], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": [ "Release Notes", "Vendor Advisory" ], "url": "https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history" } ], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [ { "description": [ { "lang": "en", "value": "CWE-834" } ], "source": "security-advisories@github.com", "type": "Secondary" }, { "description": [ { "lang": "en", "value": "CWE-834" } ], "source": "nvd@nist.gov", "type": "Primary" } ] }
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Sightings
Author | Source | Type | Date |
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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.
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