| id: GO-2021-0241 |
| modules: |
| - module: std |
| versions: |
| - fixed: 1.15.13 |
| - introduced: 1.16.0-0 |
| fixed: 1.16.5 |
| vulnerable_at: 1.16.4 |
| packages: |
| - package: net/http/httputil |
| symbols: |
| - ReverseProxy.ServeHTTP |
| skip_fix: 'TODO: revisit this reason (fix appears to not work with Go <1.18)' |
| summary: Attacker can drop certain headers in net/http/httputil |
| description: |- |
| ReverseProxy can be made to forward certain hop-by-hop headers, including |
| Connection. If the target of the ReverseProxy is itself a reverse proxy, this |
| lets an attacker drop arbitrary headers, including those set by the |
| ReverseProxy.Director. |
| published: 2022-02-17T17:33:16Z |
| cves: |
| - CVE-2021-33197 |
| credits: |
| - Mattias Grenfeldt (https://grenfeldt.dev) |
| - Asta Olofsson |
| references: |
| - fix: https://go.dev/cl/321929 |
| - fix: https://go.googlesource.com/go/+/950fa11c4cb01a145bb07eeb167d90a1846061b3 |
| - web: https://groups.google.com/g/golang-announce/c/RgCMkAEQjSI |
| - report: https://go.dev/issue/46313 |
