Important: shim

Issue Overview:

A remote code execution vulnerability was found in Shim. The Shim boot support trusts attacker-controlled values when parsing an HTTP response. This flaw allows an attacker to craft a specific malicious HTTP request, leading to a completely controlled out-of-bounds write primitive and complete system compromise. (CVE-2023-40547)

Affected Packages:

shim

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 shim to update your system.

New Packages:

aarch64:  
    shim-unsigned-aa64-12-1.amzn2.0.4.aarch64  
  
noarch:  
    shim-unsigned-x64-debuginfo-12-1.amzn2.0.4.noarch  
    shim-unsigned-aa64-debuginfo-12-1.amzn2.0.4.noarch  
  
src:  
    shim-12-1.amzn2.0.4.src  
  
x86_64:  
    shim-unsigned-x64-12-1.amzn2.0.4.x86_64  

Additional References

Red Hat: CVE-2023-40547

Mitre: CVE-2023-40547