Important: nghttp2

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

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update nghttp2 to update your system.

New Packages:

aarch64:  
    nghttp2-1.41.0-1.amzn2.aarch64  
    libnghttp2-1.41.0-1.amzn2.aarch64  
    libnghttp2-devel-1.41.0-1.amzn2.aarch64  
    nghttp2-debuginfo-1.41.0-1.amzn2.aarch64  
  
i686:  
    nghttp2-1.41.0-1.amzn2.i686  
    libnghttp2-1.41.0-1.amzn2.i686  
    libnghttp2-devel-1.41.0-1.amzn2.i686  
    nghttp2-debuginfo-1.41.0-1.amzn2.i686  
  
src:  
    nghttp2-1.41.0-1.amzn2.src  
  
x86_64:  
    nghttp2-1.41.0-1.amzn2.x86_64  
    libnghttp2-1.41.0-1.amzn2.x86_64  
    libnghttp2-devel-1.41.0-1.amzn2.x86_64  
    nghttp2-debuginfo-1.41.0-1.amzn2.x86_64  

Additional References

Red Hat: CVE-2020-11080

Mitre: CVE-2020-11080