Vulmon
Amazon Linux AMI Security Advisory: ALAS-2020-1404
Advisory Release Date: 2020-07-27 23:18 Pacific
Advisory Updated Date: 2020-07-29 21:38 Pacific
Severity:
Important
References:
CVE-2020-11080
Issue Overview:
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. (CVE-2020-11080)
Affected Packages:
nghttp2
Issue Correction:
Run yum update nghttp2 to update your system.
New Packages:
i686:
libnghttp2-1.33.0-1.1.6.amzn1.i686
nghttp2-debuginfo-1.33.0-1.1.6.amzn1.i686
nghttp2-1.33.0-1.1.6.amzn1.i686
libnghttp2-devel-1.33.0-1.1.6.amzn1.i686
src:
nghttp2-1.33.0-1.1.6.amzn1.src
x86_64:
libnghttp2-devel-1.33.0-1.1.6.amzn1.x86_64
nghttp2-debuginfo-1.33.0-1.1.6.amzn1.x86_64
libnghttp2-1.33.0-1.1.6.amzn1.x86_64
nghttp2-1.33.0-1.1.6.amzn1.x86_64