CVE-2020-11080

In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame
payload causes denial of service. The proof of concept attack involves a
malicious client constructing a SETTINGS frame with a length of 14,400
bytes (2400 individual settings entries) over and over again. The attack
causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability.
There is a workaround to this vulnerability. Implement
nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS
frame and the number of settings entries are large (e.g., > 32), then drop
the connection.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=962145&gt;

Notes