CVE-2019-18802

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
mitreCNA
---
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CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 13%
VendorProductVersion
envoyproxyenvoy
𝑥
≤ 1.12.1
𝑥
= Vulnerable software versions
References
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/#%21forum/envoy-users
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/#%21forum/envoy-users