CVE-2019-18802
CRITICAL severity · CVSS 9.8
9.8CVSS CRITICAL
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)2%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://github.com/envoyproxy/envoy/commits/master ↗
Additional information
- NVD record
- https://github.com/envoyproxy/envoy/commits/masterPatch
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00034.html
- https://blog.envoyproxy.io
- https://groups.google.com/forum/#%21forum/envoy-users
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-356m-vhw2-wcm4Advisory