GHSA-3cw6-2j68-868p Envoy vulnerable to crash for scoped ip address during DNS

• Go github.com/envoyproxy/envoy: 1.37.0 (no fix yet) • Go github.com/envoyproxy/envoy: >= 1.36.0, <= 1.36.4 (no fix yet) • Go github.com/envoyproxy/envoy: >= 1.35.0, <= 1.35.8 (no fix yet) • Go github.com/envoyproxy/envoy: <= 1.34.12 (no fix yet)

Summary Calling `Utility::getAddressWithPort` with a scoped IPv6 addresses causes a crash. This utility is called in the data plane from the original_src filter and the dns filter. Details The crashing function is `Utility::getAddressWithPort`. The crash occurs if a string containing a scoped IPv6 address is passed to this function. This vulnerability affects: 1. The original src filter: If the filter is configured and the original source is a scoped IPv6 address, it will cause a crash. 2. DNS response address resolution: If a DNS response contains a scoped IPv6 address, this will also trigger the crash. PoC To reproduce the vulnerability: 1. Method A (Original Src Filter): Configure the `original src` filter in Envoy and provide a scoped IPv6 address as the original source. 2. Method B (DNS Resolution): Trigger a DNS resolution process within Envoy where the DNS response contains a scoped IPv6 address. Impact This is a Denial of Service (DoS) vulnerability. It impacts users who have the `original src` filter configured or whose Envoy instances resolve addresses from DNS responses that may contain scoped IPv6 addresses.