CVE-2021-32780

CVE Details

Release Date:	2021-08-24
Impact:	None	What is this?

Description

Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions Envoy transitions a H/2 connection to the CLOSED state when it receives a GOAWAY frame without any streams outstanding. The connection state is transitioned to DRAINING when it receives a SETTING frame with the SETTINGS_MAX_CONCURRENT_STREAMS parameter set to 0. Receiving these two frames in the same I/O event results in abnormal termination of the Envoy process due to invalid state transition from CLOSED to DRAINING. A sequence of H/2 frames delivered by an untrusted upstream server will result in Denial of Service in the presence of untrusted **upstream** servers. Envoy versions 1.19.1, 1.18.4 contain fixes to stop processing of pending H/2 frames after connection transition to the CLOSED state.

See more information about CVE-2021-32780 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.5
Vector String:	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Version:	3.0
Attack Vector:	Network
Attack Complexity:	Low
Privileges Required:	None
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (istio)	ELSA-2021-9525	2021-11-10
Oracle Linux version 7 (istio)	ELSA-2021-9526	2021-11-09
Oracle Linux version 7 (kubernetes)	ELSA-2021-9526	2021-11-09
Oracle Linux version 7 (olcne)	ELSA-2021-9525	2021-11-10
Oracle Linux version 7 (olcne)	ELSA-2021-9526	2021-11-09
Oracle Linux version 8 (istio)	ELSA-2021-9525	2021-11-10
Oracle Linux version 8 (istio)	ELSA-2021-9546	2021-11-09
Oracle Linux version 8 (kubernetes)	ELSA-2021-9546	2021-11-09
Oracle Linux version 8 (olcne)	ELSA-2021-9525	2021-11-10
Oracle Linux version 8 (olcne)	ELSA-2021-9546	2021-11-09