SUSE-SU-2021:14659-1: important: Security update for grub2

sle-updates at sle-updates at
Tue Mar 2 23:31:26 UTC 2021

   SUSE Security Update: Security update for grub2

Announcement ID:    SUSE-SU-2021:14659-1
Rating:             important
References:         #1175970 #1176711 #1177883 #1179264 #1179265 
                    #1182057 #1182262 #1182263 
Cross-References:   CVE-2017-9763 CVE-2020-14372 CVE-2020-25632
                    CVE-2020-25647 CVE-2020-27749 CVE-2020-27779
                    CVE-2021-20225 CVE-2021-20233
CVSS scores:
                    CVE-2017-9763 (NVD) : 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
                    CVE-2017-9763 (SUSE): 4.1 CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
                    CVE-2020-14372 (SUSE): 7.5 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
                    CVE-2020-25632 (SUSE): 7.5 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
                    CVE-2020-25647 (SUSE): 7.6 CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
                    CVE-2020-27749 (SUSE): 7.5 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
                    CVE-2020-27779 (SUSE): 7.5 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
                    CVE-2021-20225 (SUSE): 7.5 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
                    CVE-2021-20233 (SUSE): 7.5 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected Products:
                    SUSE Linux Enterprise Server 11-SP4-LTSS
                    SUSE Linux Enterprise Debuginfo 11-SP4

   An update that fixes 8 vulnerabilities is now available.


   This update for grub2 fixes the following issues:

   grub2 now implements the new "SBAT" method for SHIM based secure boot
   revocation. (bsc#1182057)

   grub2 was updated to the 2.02 version (same as SUSE Linux Enterprise 12

   Following security issues are fixed that can violate secure boot

   - CVE-2020-25632: Fixed a use-after-free in rmmod command (bsc#1176711)
   - CVE-2020-25647: Fixed an out-of-bound write in
     grub_usb_device_initialize() (bsc#1177883)
   - CVE-2020-27749: Fixed a stack buffer overflow in
     grub_parser_split_cmdline (bsc#1179264)
   - CVE-2020-27779, CVE-2020-14372: Disallow cutmem and acpi commands in
     secure boot mode (bsc#1179265 bsc#1175970)
   - CVE-2021-20225: Fixed a heap out-of-bounds write in short form option
     parser (bsc#1182262)
   - CVE-2021-20233: Fixed a heap out-of-bound write due to mis-calculation
     of space required for quoting (bsc#1182263)

Patch Instructions:

   To install this SUSE Security 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 11-SP4-LTSS:

      zypper in -t patch slessp4-grub2-14659=1

   - SUSE Linux Enterprise Debuginfo 11-SP4:

      zypper in -t patch dbgsp4-grub2-14659=1

Package List:

   - SUSE Linux Enterprise Server 11-SP4-LTSS (x86_64):


   - SUSE Linux Enterprise Debuginfo 11-SP4 (x86_64):



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