CVE-2019-18802 Information

Description

An issue was discovered in Envoy 1.12.0. An untrusted remote client may send an HTTP header (such as Host) with whitespace after the header content. Envoy will treat \header-value \ as a different string from \header-value\ so for example with the Host header \example.com \ one could bypass \example.com\ matchers.

CVSS Vector

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

Reference

http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00034.html https://blog.envoyproxy.io https://github.com/envoyproxy/envoy/commits/master https://github.com/envoyproxy/envoy/security/advisories/GHSA-356m-vhw2-wcm4 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

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8