CVE-2023-45288: HTTP/2 CONTINUATION flood in net/http

First published: Wed Mar 06 2024(Updated: )

An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.

Credit: security@golang.org security@golang.org

Affected Software	Affected Version	How to fix
go/golang.org/x/net	<0.23.0	0.23.0
go/net/http	>=1.22.0-0<1.22.2	1.22.2
go/golang.org/x/net/http2	<0.23.0	0.23.0
go/net/http	<1.21.9	1.21.9
IBM Planning Analytics Local - IBM Planning Analytics Workspace	<=2.1
IBM Planning Analytics Local - IBM Planning Analytics Workspace	<=2.0
redhat/golang	<1.22.2	1.22.2
redhat/golang	<1.21.9	1.21.9
redhat/golang.org/x/net	<0.23.0	0.23.0
debian/golang-1.15	<=1.15.15-1~deb11u4
debian/golang-1.19	<=1.19.8-2
debian/golang-1.22		1.22.9-2
debian/golang-golang-x-net	<=1:0.0+git20210119.5f4716e+dfsg-4<=1:0.7.0+dfsg-1	1:0.27.0-1