Security update for shim

Announcement ID: SUSE-SU-2023:2150-1
Rating: important
References:
Cross-References:
CVSS scores:
  • CVE-2022-28737 ( SUSE ): 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CVE-2022-28737 ( NVD ): 6.5 CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
Affected Products:
  • SUSE Linux Enterprise High Performance Computing 12 SP2
  • SUSE Linux Enterprise Server 12 SP2
  • SUSE Linux Enterprise Server 12 SP2 BCL 12-SP2

An update that solves one vulnerability, contains two features and has 11 security fixes can now be installed.

Description:

This update for shim fixes the following issues:

  • Updated shim signature after shim 15.7 be signed back: signature-sles.x86_64.asc, signature-sles.aarch64.asc (bsc#1198458)

  • Add POST_PROCESS_PE_FLAGS=-N to the build command in shim.spec to disable the NX compatibility flag when using post-process-pe because grub2 is not ready. (bsc#1205588)

  • Enable the NX compatibility flag by default. (jsc#PED-127)

Update to 15.7 (bsc#1198458) (jsc#PED-127):

  • Make SBAT variable payload introspectable
  • Reference MokListRT instead of MokList
  • Add a link to the test plan in the readme.
  • [V3] Enable TDX measurement to RTMR register
  • Discard load-options that start with a NUL
  • Fixed load_cert_file bugs
  • Add -malign-double to IA32 compiler flags
  • pe: Fix image section entry-point validation
  • make-archive: Build reproducible tarball
  • mok: remove MokListTrusted from PCR 7

Other fixes:

  • Support enhance shim measurement to TD RTMR. (jsc#PED-1273)

  • shim-install: ensure grub.cfg created is not overwritten after installing grub related files

  • Add logic to shim.spec to only set sbat policy when efivarfs is writeable. (bsc#1201066)
  • Add logic to shim.spec for detecting --set-sbat-policy option before using mokutil to set sbat policy. (bsc#1202120)
  • Change the URL in SBAT section to mail:security@suse.de. (bsc#1193282)

Update to 15.6 (bsc#1198458):

  • MokManager: removed Locate graphic output protocol fail error message
  • shim: implement SBAT verification for the shim_lock protocol
  • post-process-pe: Fix a missing return code check
  • Update github actions matrix to be more useful
  • post-process-pe: Fix format string warnings on 32-bit platforms
  • Allow MokListTrusted to be enabled by default
  • Re-add ARM AArch64 support
  • Use ASCII as fallback if Unicode Box Drawing characters fail
  • make: don't treat cert.S specially
  • shim: use SHIM_DEVEL_VERBOSE when built in devel mode
  • Break out of the inner sbat loop if we find the entry.
  • Support loading additional certificates
  • Add support for NX (W^X) mitigations.
  • Fix preserve_sbat_uefi_variable() logic
  • SBAT Policy latest should be a one-shot
  • pe: Fix a buffer overflow when SizeOfRawData > VirtualSize
  • pe: Perform image verification earlier when loading grub
  • Update advertised sbat generation number for shim
  • Update SBAT generation requirements for 05/24/22
  • Also avoid CVE-2022-28737 in verify_image() by @vathpela

Update to 15.5 (bsc#1198458):

  • Broken ia32 relocs and an unimportant submodule change.
  • mok: allocate MOK config table as BootServicesData
  • Don't call QueryVariableInfo() on EFI 1.10 machines (bsc#1187260)
  • Relax the check for import_mok_state() (bsc#1185261)
  • SBAT.md: trivial changes
  • shim: another attempt to fix load options handling
  • Add tests for our load options parsing.
  • arm/aa64: fix the size of .rela* sections
  • mok: fix potential buffer overrun in import_mok_state
  • mok: relax the maximum variable size check
  • Don't unhook ExitBootServices when EBS protection is disabled
  • fallback: find_boot_option() needs to return the index for the boot entry in optnum
  • httpboot: Ignore case when checking HTTP headers
  • Fallback allocation errors
  • shim: avoid BOOTx64.EFI in message on other architectures
  • str: remove duplicate parameter check
  • fallback: add compile option FALLBACK_NONINTERACTIVE
  • Test mok mirror
  • Modify sbat.md to help with readability.
  • csv: detect end of csv file correctly
  • Specify that the .sbat section is ASCII not UTF-8
  • tests: add "include-fixed" GCC directory to include directories
  • pe: simplify generate_hash()
  • Don't make shim abort when TPM log event fails (RHBZ #2002265)
  • Fallback to default loader if parsed one does not exist
  • fallback: Fix for BootOrder crash when index returned
  • Better console checks
  • docs: update SBAT UEFI variable name
  • Don't parse load options if invoked from removable media path
  • fallback: fix fallback not passing arguments of the first boot option
  • shim: Don't stop forever at "Secure Boot not enabled" notification
  • Allocate mokvar table in runtime memory.
  • Remove post-process-pe on 'make clean'

  • pe: missing perror argument

  • CVE-2022-28737: Fixed a buffer overflow when SizeOfRawData > VirtualSize (bsc#1198458)

  • Add mokutil command to post script for setting sbat policy to latest mode when the SbatPolicy-605dab50-e046-4300-abb6-3dd810dd8b23 is not created. (bsc#1198458)

  • Updated vendor dbx binary and script (bsc#1198458)

  • Updated dbx-cert.tar.xz and vendor-dbx-sles.bin for adding SLES-UEFI-SIGN-Certificate-2021-05.crt to vendor dbx list.

  • Updated dbx-cert.tar.xz and vendor-dbx-opensuse.bin for adding openSUSE-UEFI-SIGN-Certificate-2021-05.crt to vendor dbx list.
  • Updated vendor-dbx.bin for adding SLES-UEFI-SIGN-Certificate-2021-05.crt and openSUSE-UEFI-SIGN-Certificate-2021-05.crt for testing environment.

  • Updated generate-vendor-dbx.sh script for generating a vendor-dbx.bin file which includes all .der for testing environment.

  • avoid buffer overflow when copying data to the MOK config table (bsc#1185232)

  • Disable exporting vendor-dbx to MokListXRT since writing a large RT variable could crash some machines (bsc#1185261)
  • ignore the odd LoadOptions length (bsc#1185232)
  • shim-install: reset def_shim_efi to "shim.efi" if the given file doesn't exist
  • relax the maximum variable size check for u-boot (bsc#1185621)

  • handle ignore_db and user_insecure_mode correctly (bsc#1185441, bsc#1187071)

  • Split the keys in vendor-dbx.bin to vendor-dbx-sles and vendor-dbx-opensuse for shim-sles and shim-opensuse to reduce the size of MokListXRT (bsc#1185261)

  • Also update generate-vendor-dbx.sh in dbx-cert.tar.xz

Update shim to 15.4-4.7.1, Version: 15.4, "Thu Jul 15 2021"

  • Update the SLE signatures
  • Includes fixes for MOK and boot problems (bsc#1187696, bsc#1185261, bsc#1185441, bsc#1187071, bsc#1185621, bsc#1185261, bsc#1185232, bsc#1185261, bsc#1187260, bsc#1185232)

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:

  • SUSE Linux Enterprise Server 12 SP2 BCL 12-SP2
    zypper in -t patch SUSE-SLE-SERVER-12-SP2-BCL-2023-2150=1

Package List:

  • SUSE Linux Enterprise Server 12 SP2 BCL 12-SP2 (x86_64)
    • shim-15.7-22.15.1

References: