cve-2021-32778
Vulnerability from cvelistv5
Published
2021-08-24 20:30
Modified
2024-08-03 23:33
Severity ?
EPSS score ?
Summary
Excessive CPU utilization when closing HTTP/2 streams
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 |
Impacted products
▼ | Vendor | Product |
---|---|---|
envoyproxy | envoy |
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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. 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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. 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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.