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Amazon Linux AMI: CVE-2020-11080: Security patch for nghttp2 (ALAS-2020-1404)

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Amazon Linux AMI: CVE-2020-11080: Security patch for nghttp2 (ALAS-2020-1404)

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
06/03/2020
Created
08/01/2020
Added
07/30/2020
Modified
07/30/2020

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.

Solution(s)

  • amazon-linux-upgrade-nghttp2

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