| id: GO-2022-0212 |
| modules: |
| - module: std |
| versions: |
| - fixed: 1.12.10 |
| - introduced: 1.13.0-0 |
| fixed: 1.13.1 |
| vulnerable_at: 1.13.0 |
| packages: |
| - package: net/textproto |
| symbols: |
| - Reader.ReadMimeHeader |
| skip_fix: 'TODO: revisit this reason (fix appears to not work with Go <1.18)' |
| summary: Request smuggling due to accepting invalid headers in net/http via net/textproto |
| description: |- |
| net/http (through net/textproto) used to accept and normalize invalid HTTP/1.1 |
| headers with a space before the colon, in violation of RFC 7230. |
| |
| If a Go server is used behind an uncommon reverse proxy that accepts and |
| forwards but doesn't normalize such invalid headers, the reverse proxy and the |
| server can interpret the headers differently. This can lead to filter bypasses |
| or request smuggling, the latter if requests from separate clients are |
| multiplexed onto the same upstream connection by the proxy. Such invalid headers |
| are now rejected by Go servers, and passed without normalization to Go client |
| applications. |
| published: 2022-05-23T22:46:20Z |
| cves: |
| - CVE-2019-16276 |
| credits: |
| - Andrew Stucki (99designs.com) |
| - Adam Scarr (99designs.com) |
| - Jan Masarik (masarik.sh) |
| references: |
| - fix: https://go.dev/cl/197503 |
| - fix: https://go.googlesource.com/go/+/41b1f88efab9d263408448bf139659119002ea50 |
| - report: https://go.dev/issue/34540 |
| - web: https://groups.google.com/g/golang-announce/c/cszieYyuL9Q/m/g4Z7pKaqAgAJ |
