CVE-2024-27919

HTTP/2: memory exhaustion due to CONTINUATION frame flood

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

Envoy is a cloud-native, open-source edge and service proxy. In versions 1.29.0 and 1.29.1, theEnvoy HTTP/2 protocol stack is vulnerable to the flood of CONTINUATION frames. Envoy's HTTP/2 codec does not reset a request when header map limits have been exceeded. This allows an attacker to send an sequence of CONTINUATION frames without the END_HEADERS bit set causing unlimited memory consumption. This can lead to denial of service through memory exhaustion. Users should upgrade to versions 1.29.2 to mitigate the effects of the CONTINUATION flood. Note that this vulnerability is a regression in Envoy version 1.29.0 and 1.29.1 only. As a workaround, downgrade to version 1.28.1 or earlier or disable HTTP/2 protocol for downstream connections.

Envoy es un proxy de servicio y borde de código abierto y nativo de la nube. En las versiones 1.29.0 y 1.29.1, la pila de protocolos Envoy HTTP/2 es vulnerable a la avalancha de tramas de CONTINUACIÓN. El códec HTTP/2 de Envoy no restablece una solicitud cuando se exceden los límites del mapa de encabezado. Esto permite a un atacante enviar una secuencia de tramas CONTINUACIÓN sin que el bit END_HEADERS esté configurado, lo que provoca un consumo ilimitado de memoria. Esto puede provocar una denegación de servicio por agotamiento de la memoria. Los usuarios deben actualizar a las versiones 1.29.2 para mitigar los efectos de la inundación de CONTINUACIÓN. Tenga en cuenta que esta vulnerabilidad es una regresión en Envoy versión 1.29.0 y 1.29.1 únicamente. Como workaround, baje a la versión 1.28.1 o anterior o desactive el protocolo HTTP/2 para conexiones descendentes.

*Credits: N/A

CVSS Scores

GitHubv3.1 7.5

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-02-28 CVE Reserved
2024-04-04 CVE Published
2024-04-13 First Exploit
2024-05-02 EPSS Updated
2024-08-02 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-390: Detection of Error Condition Without Action

CAPEC

References (5)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2024/04/03/16
http://www.openwall.com/lists/oss-security/2024/04/05/3
https://github.com/envoyproxy/envoy/commit/57a02565532c18eb9df972a3e8974be3ae59f2d5	X_refsource_misc
https://github.com/envoyproxy/envoy/security/advisories/GHSA-gghf-vfxp-799r	X_refsource_confirm

URL	Date	SRC
https://github.com/lockness-Ko/CVE-2024-27316	2024-04-13

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"				>= 1.29.0 < 1.29.2 Search vendor "Envoyproxy" for product "Envoy" and version " >= 1.29.0 < 1.29.2"		en		Affected