CVE-2019-18801

envoy: an untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1. This may be used to corrupt nearby heap contents (leading to a query-of-death scenario) or may be used to bypass Envoy's access control mechanisms such as path based routing. An attacker can also modify requests from other users that happen to be proximal temporally and spatially.

Se detectó un problema en Envoy versión 1.12.0. Un cliente remoto no confiable puede enviar peticiones HTTP/2 que escriben en el pila fuera de los buffers de petición cuando el flujo ascendente es HTTP/1. Esto puede ser usado para corromper el contenido de la pila próximo (lo que conlleva a un escenario de query-of-death) o se puede usar para omitir los mecanismos de control de acceso de Envoy, como el enrutamiento basado en la ruta. Un atacante también puede modificar las peticiones de otros usuarios que pasan a ser proximales temporal y espacialmente.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-11-07 CVE Reserved
2019-12-12 CVE Published
2023-11-08 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-131: Incorrect Calculation of Buffer Size
CWE-787: Out-of-bounds Write

CAPEC

References (7)

URL	Tag	Source
https://access.redhat.com/errata/RHSA-2019:4222	Third Party Advisory
https://blog.envoyproxy.io	Product
https://groups.google.com/forum/#%21forum/envoy-users	X_refsource_misc

URL	Date	SRC
https://github.com/envoyproxy/envoy/security/advisories/GHSA-gxvv-x4p2-rppp	2024-08-05

URL	Date	SRC
https://github.com/envoyproxy/envoy/commits/master	2023-11-07

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2019-18801	2019-12-11
https://bugzilla.redhat.com/show_bug.cgi?id=1773444	2019-12-11

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"				<= 1.12.1 Search vendor "Envoyproxy" for product "Envoy" and version " <= 1.12.1"		-		Affected