Important: xorg-x11-server

Issue Overview:

A use-after-free flaw was found in xorg-x11-server-Xvfb. This issue occurs in Xvfb with a very specific and legacy configuration (a multi-screen setup with multiple protocol screens, also known as Zaphod mode). If the pointer is warped from a screen 1 to a screen 0, a use-after-free issue may be triggered during shutdown or reset of the Xvfb server, allowing for possible escalation of privileges or denial of service. (CVE-2023-5574)

Affected Packages:

xorg-x11-server

Issue Correction:
Run yum update xorg-x11-server to update your system.

New Packages:

i686:  
    xorg-x11-server-common-1.17.4-18.53.amzn1.i686  
    xorg-x11-server-debuginfo-1.17.4-18.53.amzn1.i686  
    xorg-x11-server-Xdmx-1.17.4-18.53.amzn1.i686  
    xorg-x11-server-Xorg-1.17.4-18.53.amzn1.i686  
    xorg-x11-server-devel-1.17.4-18.53.amzn1.i686  
    xorg-x11-server-Xephyr-1.17.4-18.53.amzn1.i686  
    xorg-x11-server-Xnest-1.17.4-18.53.amzn1.i686  
    xorg-x11-server-Xvfb-1.17.4-18.53.amzn1.i686  
  
noarch:  
    xorg-x11-server-source-1.17.4-18.53.amzn1.noarch  
  
src:  
    xorg-x11-server-1.17.4-18.53.amzn1.src  
  
x86_64:  
    xorg-x11-server-Xephyr-1.17.4-18.53.amzn1.x86_64  
    xorg-x11-server-common-1.17.4-18.53.amzn1.x86_64  
    xorg-x11-server-devel-1.17.4-18.53.amzn1.x86_64  
    xorg-x11-server-debuginfo-1.17.4-18.53.amzn1.x86_64  
    xorg-x11-server-Xdmx-1.17.4-18.53.amzn1.x86_64  
    xorg-x11-server-Xnest-1.17.4-18.53.amzn1.x86_64  
    xorg-x11-server-Xvfb-1.17.4-18.53.amzn1.x86_64  
    xorg-x11-server-Xorg-1.17.4-18.53.amzn1.x86_64  

Additional References

Red Hat: CVE-2023-5574

Mitre: CVE-2023-5574