Important: libX11

Issue Overview:

A missing validation flaw was found in libX11. This flaw allows an attacker to inject X11 protocol commands on X clients, and in some cases, also bypass, authenticate (via injection of control characters), or potentially execute arbitrary code with permissions of the application compiled with libX11. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability. (CVE-2021-31535)

Affected Packages:

libX11

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 libX11 to update your system.

New Packages:

aarch64:  
    libX11-1.6.7-3.amzn2.0.2.aarch64  
    libX11-devel-1.6.7-3.amzn2.0.2.aarch64  
    libX11-debuginfo-1.6.7-3.amzn2.0.2.aarch64  
  
i686:  
    libX11-1.6.7-3.amzn2.0.2.i686  
    libX11-devel-1.6.7-3.amzn2.0.2.i686  
    libX11-debuginfo-1.6.7-3.amzn2.0.2.i686  
  
noarch:  
    libX11-common-1.6.7-3.amzn2.0.2.noarch  
  
src:  
    libX11-1.6.7-3.amzn2.0.2.src  
  
x86_64:  
    libX11-1.6.7-3.amzn2.0.2.x86_64  
    libX11-devel-1.6.7-3.amzn2.0.2.x86_64  
    libX11-debuginfo-1.6.7-3.amzn2.0.2.x86_64  

Additional References

Red Hat: CVE-2021-31535

Mitre: CVE-2021-31535