Update to shim 15.8

[Mate Kukri]

[Impact]

shim 15.7 is affected by multiple CVEs, including a critical severity one allowing Secure Boot bypass when netbooting.

[Test Plan]

Make sure the system is bootable both from disk and network with the new shim on each affected series

[Where problems could occur]

Boot regressions are always possible when updating such a critical component.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Launchpad Janitor (janitor)]

This bug was fixed in the package shim - 15.8-0ubuntu1

---------------
shim (15.8-0ubuntu1) mantic; urgency=medium

  * New upstream version 15.8 (LP: #2051151):
    - pe: Align section size up to page size for mem attrs (LP: #2036604)
    - SBAT level: shim,4
    - SBAT policy:
      - Latest: "shim,4\ngrub,3\ngrub.debian,4\n"
      - Automatic: "shim,2\ngrub,3\ngrub.debian,4\n"
      - Note that this does not yet revoke pre NTFS CVE fix GRUB binaries.
  * SECURITY UPDATE: a bug in an error message [LP: #2051151]
    - mok: fix LogError() invocation
    - CVE-2023-40546
  * SECURITY UPDATE: out-of-bounds write and UEFI Secure Boot bypass
    when booting via HTTP [LP: #2051151]
    - avoid incorrectly trusting HTTP headers
    - CVE-2023-40547
  * SECURITY UPDATE: out-of-bounds write and possible bug [LP: #2051151]
    - Fix integer overflow on SBAT section size on 32-bit system
    - CVE-2023-40548
  * SECURITY UPDATE: out-of-bounds read and possible bug [LP: #2051151]
    - Authenticode: verify that the signature header is in bounds.
    - CVE-2023-40549
  * SECURITY UPDATE: out-of-bounds read and possible bug [LP: #2051151]
    - pe: Fix an out-of-bound read in verify_buffer_sbat()
    - CVE-2023-40550
  * SECURITY UPDATE: out-of-bounds read and possible bug [LP: #2051151]
    - pe-relocate: Fix bounds check for MZ binaries
    - CVE-2023-40551
  * debian/rules: Update COMMIT_ID

 -- Mate Kukri <email address hidden> Thu, 25 Jan 2024 08:55:28 +0000

[Launchpad Janitor (janitor)]

This bug was fixed in the package shim-signed - 1.57

---------------
shim-signed (1.57) mantic; urgency=medium

  * New upstream version 15.8 (LP: #2051151):
    - pe: Align section size up to page size for mem attrs (LP: #2036604)
    - SBAT level: shim,4
    - SBAT policy:
      - Latest: "shim,4\ngrub,3\ngrub.debian,4\n"
      - Automatic: "shim,2\ngrub,3\ngrub.debian,4\n"
      - Note that this does not yet revoke pre NTFS CVE fix GRUB binaries.
  * SECURITY UPDATE: a bug in an error message [LP: #2051151]
    - mok: fix LogError() invocation
    - CVE-2023-40546
  * SECURITY UPDATE: out-of-bounds write and UEFI Secure Boot bypass
    when booting via HTTP [LP: #2051151]
    - avoid incorrectly trusting HTTP headers
    - CVE-2023-40547
  * SECURITY UPDATE: out-of-bounds write and possible bug [LP: #2051151]
    - Fix integer overflow on SBAT section size on 32-bit system
    - CVE-2023-40548
  * SECURITY UPDATE: out-of-bounds read and possible bug [LP: #2051151]
    - Authenticode: verify that the signature header is in bounds.
    - CVE-2023-40549
  * SECURITY UPDATE: out-of-bounds read and possible bug [LP: #2051151]
    - pe: Fix an out-of-bound read in verify_buffer_sbat()
    - CVE-2023-40550
  * SECURITY UPDATE: out-of-bounds read and possible bug [LP: #2051151]
    - pe-relocate: Fix bounds check for MZ binaries
    - CVE-2023-40551
  * Makefile: Add option for building without an externally signed shim

 -- Mate Kukri <email address hidden> Thu, 29 Feb 2024 10:26:43 +0000

[Mate Kukri (mkukri)]

Targeting to series with Noble marked 'Fix Released'.

Next steps are updating this bug to follow the SRU template, and prepare SRUs for the marked series.

ESM updates could potentially be required later.