CVE-2021-39162

Incorrect handling of H2 GOAWAY + SETTINGS frames

Severity Score

8.6

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, can abnormally terminate if an H/2 GOAWAY and SETTINGS frame are received in the same IO event. This can lead to a DoS in the presence of untrusted *upstream* servers. 0.15.1 contains an upgraded envoy binary with this vulnerability patched. If only trusted upstreams are configured, there is not substantial risk of this condition being triggered.

Pomerium es un proxy de acceso de código abierto consciente de la identidad. Envoy, en el que es basado Pomerium, puede terminar anormalmente si se recibe una trama H/2 GOAWAY y SETTINGS en el mismo evento IO. Esto puede conllevar a un DoS en presencia de servidores *upstream* no confiables. La versión 0.15.1 contiene un binario envoy actualizado con esta vulnerabilidad parcheada. Si sólo se configuran upstreams confiables, no se presenta un riesgo sustancial de que se desencadene esta condición

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-08-16 CVE Reserved
2021-09-09 CVE Published
2024-05-25 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-754: Improper Check for Unusual or Exceptional Conditions

CAPEC

References (3)

URL	Tag	Source
https://github.com/envoyproxy/envoy/security/advisories/GHSA-j374-mjrw-vvp8	Third Party Advisory
https://github.com/pomerium/pomerium/security/advisories/GHSA-gjcg-vrxg-xmgv	Third Party Advisory
https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ	Not Applicable

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Envoyproxy Search vendor "Envoyproxy"		Envoy Search vendor "Envoyproxy" for product "Envoy"				< 1.18.4 Search vendor "Envoyproxy" for product "Envoy" and version " < 1.18.4"		-		Affected
Envoyproxy Search vendor "Envoyproxy"		Envoy Search vendor "Envoyproxy" for product "Envoy"				1.19.0 Search vendor "Envoyproxy" for product "Envoy" and version "1.19.0"		-		Affected
Pomerium Search vendor "Pomerium"		Pomerium Search vendor "Pomerium" for product "Pomerium"				0.15.0 Search vendor "Pomerium" for product "Pomerium" and version "0.15.0"		-		Affected