Unveiling CVE-2023-40547 - Safeguarding Systems from Critical Shim Vulnerability

A vulnerability tracked as CVE-2023-40547 impacts shim, a critical piece of software used by most Linux distributions to support UEFI Secure Boot.

Discovered and reported by Bill Demirkapi at Microsoft’s Security Response Center, this particular vulnerability stems from HTTP protocol handling, leading to an out-of-bounds write and potentially complete system compromise.

In this session, Paul Asadoorian covers:

  • Understanding the Severity: Delve into the details of CVE-2023-40547 and comprehend the criticality of its impact on shim, a fundamental component in Linux distributions for UEFI Secure Boot.
  • Guidance for IT and Security Teams: Gain insights into the recommended actions and strategies that IT and Security teams should adopt to mitigate the risks associated with the vulnerability and fortify systems against potential exploits.
  • Broader Implications: Explore the landscape of vulnerability management and remediation in IT infrastructure, understanding the proactive measures organizations can take to enhance their overall security posture.


Shim Shady (CVE-2023-40547): A Bootloader Vulnerability Story

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