high
7.8
CWE
787 120
Advisory Published
CVE Published
CVE Published
Updated

CVE-2022-28737: There's a possible overflow in handle_image() when shim tries to load and execute crafted EFI executables

First published: Thu May 26 2022(Updated: )

There's a possible overflow in handle_image() when shim tries to load and execute crafted EFI executables; The handle_image() function takes into account the SizeOfRawData field from each section to be loaded. An attacker can leverage this to perform out-of-bound writes into memory. Arbitrary code execution is not discarded in such scenario.

Credit: security@ubuntu.com security@ubuntu.com security@ubuntu.com

Affected SoftwareAffected VersionHow to fix
redhat/shim<0:15.6-1.el8
0:15.6-1.el8
redhat/shim-unsigned-x64<0:15.6-1.el8
0:15.6-1.el8
redhat/shim<0:15.6-1.el9
0:15.6-1.el9
redhat/shim-unsigned-x64<0:15.6-1.el9
0:15.6-1.el9
ubuntu/shim<15.6
15.6
Redhat Shim<15.6
debian/shim<=15.4-7~deb10u1
15.7-1~deb10u1
15.7-1~deb11u1
15.7-1

Remedy

https://github.com/rhboot/shim/commit/e99bdbb827a50cde019393d3ca1e89397db221a7

Remedy

https://github.com/rhboot/shim/commit/159151b6649008793d6204a34d7b9c41221fb4b0

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2022-28737?

    CVE-2022-28737 is a vulnerability in shim that allows an attacker to perform out-of-bounds writes into memory by leveraging a crafted EFI image.

  • What is the severity of CVE-2022-28737?

    The severity of CVE-2022-28737 is high with a CVSS score of 7.8.

  • Which software is affected by CVE-2022-28737?

    The Red Hat Shim package versions up to 15.6, Red Hat Shim Unsigned x64 package versions up to 15.6, Red Hat Shim package versions up to 15.6 on el8, Red Hat Shim Unsigned x64 package versions up to 15.6 on el8, Red Hat Shim package versions up to 15.6 on el9, Red Hat Shim Unsigned x64 package versions up to 15.6 on el9, Ubuntu Shim package versions up to 15.6, and Debian Shim package versions up to 15.4-7~deb10u1 are affected by CVE-2022-28737.

  • How can an attacker exploit CVE-2022-28737?

    An attacker can exploit CVE-2022-28737 by using a crafted EFI image to perform out-of-bounds writes into memory.

  • Is there a fix available for CVE-2022-28737?

    Yes, the remedy for CVE-2022-28737 is to update to Red Hat Shim package version 15.6 or later, Red Hat Shim Unsigned x64 package version 15.6 or later, Ubuntu Shim package version 15.6 or later, or Debian Shim package version 15.7-1~deb10u1 or later.

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