Security update for shim

Announcement ID: SUSE-SU-2020:2629-1
Rating: moderate
References:
Cross-References:
CVSS scores:
  • CVE-2020-10713 ( SUSE ): 8.2 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
  • CVE-2020-10713 ( NVD ): 8.2 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Affected Products:
  • Basesystem Module 15-SP2
  • Basesystem Module 15-SP1
  • SUSE Linux Enterprise Desktop 15 SP1
  • SUSE Linux Enterprise Desktop 15 SP2
  • SUSE Linux Enterprise High Performance Computing 15 SP1
  • SUSE Linux Enterprise High Performance Computing 15 SP2
  • SUSE Linux Enterprise Real Time 15 SP1
  • SUSE Linux Enterprise Real Time 15 SP2
  • SUSE Linux Enterprise Server 15 SP1
  • SUSE Linux Enterprise Server 15 SP1 Business Critical Linux 15-SP1
  • SUSE Linux Enterprise Server 15 SP2
  • SUSE Linux Enterprise Server 15 SP2 Business Critical Linux 15-SP2
  • SUSE Linux Enterprise Server for SAP Applications 15 SP1
  • SUSE Linux Enterprise Server for SAP Applications 15 SP2
  • SUSE Manager Proxy 4.0
  • SUSE Manager Proxy 4.1
  • SUSE Manager Retail Branch Server 4.0
  • SUSE Manager Retail Branch Server 4.1
  • SUSE Manager Server 4.0
  • SUSE Manager Server 4.1

An update that solves one vulnerability and has eight security fixes can now be installed.

Description:

This update for shim fixes the following issues:

This update addresses the "BootHole" security issue (master CVE CVE-2020-10713), by disallowing binaries signed by the previous SUSE UEFI signing key from booting.

This update should only be installed after updates of grub2, the Linux kernel and (if used) Xen from July / August 2020 are applied.

Changes:

Use vendor-dbx to block old SUSE/openSUSE signkeys (bsc#1168994)

  • Add dbx-cert.tar.xz which contains the certificates to block and a script, generate-vendor-dbx.sh, to generate vendor-dbx.bin

  • Add vendor-dbx.bin as the vendor dbx to block unwanted keys

  • Update the path to grub-tpm.efi in shim-install (bsc#1174320)

  • Only check EFI variable copying when Secure Boot is enabled (bsc#1173411)
  • Use the full path of efibootmgr to avoid errors when invoking shim-install from packagekitd (bsc#1168104)
  • shim-install: add check for btrfs is used as root file system to enable relative path lookup for file. (bsc#1153953)
  • shim-install: install MokManager to \EFI\boot to process the pending MOK request (bsc#1175626, bsc#1175656)

Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Alternatively you can run the command listed for your product:

  • Basesystem Module 15-SP1
    zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP1-2020-2629=1
  • Basesystem Module 15-SP2
    zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP2-2020-2629=1

Package List:

  • Basesystem Module 15-SP1 (x86_64)
    • shim-debuginfo-15+git47-3.8.1
    • shim-15+git47-3.8.1
    • shim-debugsource-15+git47-3.8.1
  • Basesystem Module 15-SP2 (x86_64)
    • shim-debuginfo-15+git47-3.8.1
    • shim-15+git47-3.8.1
    • shim-debugsource-15+git47-3.8.1

References: