VulnerabilityModified
CVE-2019-18802
An untrusted remote client may send an HTTP header (such as Host) with whitespace after the header content.
CRITICAL 9.8EPSS 2.46%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.46% probability · 84th percentile
- CISA KEV
- Not listed
- Affected
- envoyproxy/envoy
- Source
- cve@mitre.org
References
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00034.html
- https://blog.envoyproxy.ioProduct
- https://github.com/envoyproxy/envoy/commits/masterPatch
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-356m-vhw2-wcm4Exploit, Third Party Advisory
- https://groups.google.com/forum/#%21forum/envoy-users
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00034.html
- https://blog.envoyproxy.ioProduct
- https://github.com/envoyproxy/envoy/commits/masterPatch
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-356m-vhw2-wcm4Exploit, Third Party Advisory
- https://groups.google.com/forum/#%21forum/envoy-users
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.