Description
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, Envoy does not sanitize or escape request properties when generating request headers. This can lead to characters that are illegal in header values to be sent to the upstream service. In the worst case, it can cause upstream service to interpret the original request as two pipelined requests, possibly bypassing the intent of Envoy’s security policy. Versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9 contain a patch. As a workaround, disable adding request headers based on the downstream request properties, such as downstream certificate properties.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected products
- envoyproxy / envoy>= 1.25.0, < 1.25.3 – >= 1.25.0, < 1.25.3
- envoyproxy / envoy>= 1.24.0, < 1.24.4 – >= 1.24.0, < 1.24.4
- envoyproxy / envoy>= 1.23.0, < 1.23.6 – >= 1.23.0, < 1.23.6
- envoyproxy / envoy< 1.22.9 – < 1.22.9