[github.com/caddyserver/caddy] Out-of-bounds Read can lead to client side denial of service

An out-of-bounds read in the rewrite function at /modules/caddyhttp/rewrite/rewrite.go in Caddy v2.5.1 allows attackers to cause a Denial of Service (DoS) on the client side via a crafted URI.

According to the maintainer, the bug only affects the client side of the request and cannot cause a denial of service on the server.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-34037
• https://github.com/caddyserver/caddy/issues/4775
• https://github.com/caddyserver/caddy/commit/693e9b5283e675b56084ecc83d73176cab0ee27c
• https://github.com/advisories/GHSA-m7gr-5w5g-36jf