Description
Envoy is an open source edge and service proxy designed for cloud-native applications. Envoy allows mixed-case schemes in HTTP/2, however, some internal scheme checks are case-sensitive. Prior to versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, this can lead to the rejection of requests with mixed-case schemes such as `htTp` or `htTps`, or the bypassing of some requests such as `https` in unencrypted connections. With a fix in versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, Envoy will now lowercase scheme values by default, and change the internal scheme checks that were case-sensitive to be case-insensitive. There are no known workarounds for this issue.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None
Affected products
- envoyproxy / envoy>= 1.26.0, < 1.26.4 – >= 1.26.0, < 1.26.4
- envoyproxy / envoy>= 1.25.0, < 1.25.9 – >= 1.25.0, < 1.25.9
- envoyproxy / envoy>= 1.24.0, < 1.24.10 – >= 1.24.0, < 1.24.10
- envoyproxy / envoy< 1.23.12 – < 1.23.12