Important: nghttp2

Issue Overview:

Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.(CVE-2019-9511)

Some HTTP/2 implementations are vulnerable to resource loops, potentially leading to a denial of service. The attacker creates multiple request streams and continually shuffles the priority of the streams in a way that causes substantial churn to the priority tree. This can consume excess CPU.(CVE-2019-9513)

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:  
    nghttp2-1.39.2-1.amzn2.aarch64  
    libnghttp2-1.39.2-1.amzn2.aarch64  
    libnghttp2-devel-1.39.2-1.amzn2.aarch64  
    nghttp2-debuginfo-1.39.2-1.amzn2.aarch64  
  
i686:  
    nghttp2-1.39.2-1.amzn2.i686  
    libnghttp2-1.39.2-1.amzn2.i686  
    libnghttp2-devel-1.39.2-1.amzn2.i686  
    nghttp2-debuginfo-1.39.2-1.amzn2.i686  
  
src:  
    nghttp2-1.39.2-1.amzn2.src  
  
x86_64:  
    nghttp2-1.39.2-1.amzn2.x86_64  
    libnghttp2-1.39.2-1.amzn2.x86_64  
    libnghttp2-devel-1.39.2-1.amzn2.x86_64  
    nghttp2-debuginfo-1.39.2-1.amzn2.x86_64  

Additional References

Red Hat: CVE-2019-9511, CVE-2019-9513

Mitre: CVE-2019-9511, CVE-2019-9513