Incorrect handling of internal redirects results in crash in Envoy

Vulnerability Description

Envoy is an open source edge and service proxy, designed for cloud-native applications. The envoy common router will segfault if an internal redirect selects a route configured with direct response or redirect actions. This will result in a denial of service. As a workaround turn off internal redirects if direct response entries are configured on the same listener.

References

• https://github.com/envoyproxy/envoy/security/advisories/GHSA-7r5p-7fmh-jxpg
• https://github.com/envoyproxy/envoy/commit/177d608155ba8b11598b9bbf8240e90d8c350682