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  • #299

Closed
Open
Created Jun 10, 2020 by Emily@emily🤖

user/nghttp2: CVE-2020-11080: DoS via large SETTINGS frame

Bugzilla ID 299
Alias(es) CVE-2020-11080
Reporter Max Rees (sroracle)
Assignee Max Rees (sroracle)
Reported 2020-06-09 19:07:09 -0500
Modified 2020-06-15 16:39:00 -0500
Status RESOLVED FIXED
Version 1.0-RC1
Hardware Adélie Linux / All
Importance --- / major
URL https://nvd.nist.gov/vuln/detail/CVE-2020-11080
See also https://bts.adelielinux.org/show_bug.cgi?id=300

Description

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.

Fixed in >= 1.41.0

https://github.com/nghttp2/nghttp2/security/advisories/GHSA-q5wr-xfw9-q7xr
https://github.com/nghttp2/nghttp2/commit/336a98feb0d56b9ac54e12736b18785c27f75090
https://github.com/nghttp2/nghttp2/commit/f8da73bd042f810f34d19f9eae02b46d870af394

Edited Feb 02, 2022 by Zach van Rijn
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