FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

go -- invalid headers are normalized, allowing request smuggling

Affected packages
go < 1.13.1,1
go-devel < g20190925


VuXML ID a92dcc5c-e05c-11e9-b589-10c37b4ac2ea
Discovery 2019-09-25
Entry 2019-09-26

The Go project reports:

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 a 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 connection by the proxy. Such invalid headers are now rejected by Go servers, and passed without normalization to Go client applications.


CVE Name CVE-2019-16276