GO-2022-0236

Dashboard / Vulnerabilities / GO-2022-0236

GO-2022-0236

Summary: Panic due to large headers in net/http and golang.org/x/net/http/httpguts

Details: A malicious HTTP server or client can cause the net/http client or server to panic. ReadRequest and ReadResponse can hit an unrecoverable panic when reading a very large header (over 7MB on 64-bit architectures, or over 4MB on 32-bit ones). Transport and Client are vulnerable and the program can be made to crash by a malicious server. Server is not vulnerable by default, but can be if the default max header of 1MB is overridden by setting Server.MaxHeaderBytes to a higher value, in which case the program can be made to crash by a malicious client. This also affects golang.org/x/net/http2/h2c and HeaderValuesContainsToken in golang.org/x/net/http/httpguts.

References: https://go.dev/cl/313069, https://go.googlesource.com/net/+/89ef3d95e781148a0951956029c92a211477f7f9, https://go.dev/issue/45710, https://groups.google.com/g/golang-announce/c/cu9SP4eSXMc