Important: sudo

Issue Overview:

When sudo runs a command in shell mode, either via the -s or -i command line option, it escapes special characters in the command’s arguments with a backslash. The sudoers policy plugin will then remove the escape characters from the arguments before evaluating the sudoers policy (which doesn’t expect the escape characters) if the command is being run in shell mode. (CVE-2021-3156)

Affected Packages:

sudo

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

New Packages:

i686:  
    sudo-debuginfo-1.8.23-9.56.amzn1.i686  
    sudo-devel-1.8.23-9.56.amzn1.i686  
    sudo-1.8.23-9.56.amzn1.i686  
  
src:  
    sudo-1.8.23-9.56.amzn1.src  
  
x86_64:  
    sudo-1.8.23-9.56.amzn1.x86_64  
    sudo-devel-1.8.23-9.56.amzn1.x86_64  
    sudo-debuginfo-1.8.23-9.56.amzn1.x86_64  

Additional References

Red Hat: CVE-2021-3156

Mitre: CVE-2021-3156