Headline
CVE-2020-11080: Earlier check for settings flood · nghttp2/nghttp2@f8da73b
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.
@@ -5653,6 +5653,12 @@ ssize_t nghttp2_session_mem_recv(nghttp2_session *session, const uint8_t *in,
break;
}
/* Check the settings flood counter early to be safe */
if (session->obq_flood_counter_ >= session->max_outbound_ack &&
!(iframe->frame.hd.flags & NGHTTP2_FLAG_ACK)) {
return NGHTTP2_ERR_FLOODED;
}
iframe->state = NGHTTP2_IB_READ_SETTINGS;
if (iframe->payloadleft) {
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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.