CVE-2019-18838 Information

Description

An issue was discovered in Envoy 1.12.0. Upon receipt of a malformed HTTP request without a Host header it sends an internally generated \Invalid request\ response. This internally generated response is dispatched through the configured encoder filter chain before being sent to the client. An encoder filter that invokes route manager APIs that access a request’s Host header causes a NULL pointer dereference resulting in abnormal termination of the Envoy process.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://blog.envoyproxy.io https://github.com/envoyproxy/envoy/commits/master https://github.com/envoyproxy/envoy/security/advisories/GHSA-f2rv-4w6x-rwhc https://groups.google.com/forum/!forum/envoy-users

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5