SUSE SLES15 Security Update : grub2 (SUSE-SU-2021:0684-1)

high Nessus Plugin ID 146978
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote SUSE host is missing one or more security updates.

Description

This update for grub2 fixes the following issues :

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

Following security issues are fixed that can violate secure boot constraints :

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-based 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)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

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 Manager Server 4.0 :

zypper in -t patch SUSE-SLE-Product-SUSE-Manager-Server-4.0-2021-684=1

SUSE Manager Retail Branch Server 4.0 :

zypper in -t patch SUSE-SLE-Product-SUSE-Manager-Retail-Branch-Server-4.0-2021-684=1

SUSE Manager Proxy 4.0 :

zypper in -t patch SUSE-SLE-Product-SUSE-Manager-Proxy-4.0-2021-684=1

SUSE Linux Enterprise Server for SAP 15-SP1 :

zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP1-2021-684=1

SUSE Linux Enterprise Server 15-SP1-LTSS :

zypper in -t patch SUSE-SLE-Product-SLES-15-SP1-LTSS-2021-684=1

SUSE Linux Enterprise Server 15-SP1-BCL :

zypper in -t patch SUSE-SLE-Product-SLES-15-SP1-BCL-2021-684=1

SUSE Linux Enterprise High Performance Computing 15-SP1-LTSS :

zypper in -t patch SUSE-SLE-Product-HPC-15-SP1-LTSS-2021-684=1

SUSE Linux Enterprise High Performance Computing 15-SP1-ESPOS :

zypper in -t patch SUSE-SLE-Product-HPC-15-SP1-ESPOS-2021-684=1

SUSE Enterprise Storage 6 :

zypper in -t patch SUSE-Storage-6-2021-684=1

SUSE CaaS Platform 4.0 :

To install this update, use the SUSE CaaS Platform 'skuba' tool. I will inform you if it detects new updates and let you then trigger updating of the complete cluster in a controlled way.

See Also

https://bugzilla.suse.com/show_bug.cgi?id=1175970

https://bugzilla.suse.com/show_bug.cgi?id=1176711

https://bugzilla.suse.com/show_bug.cgi?id=1177883

https://bugzilla.suse.com/show_bug.cgi?id=1179264

https://bugzilla.suse.com/show_bug.cgi?id=1179265

https://bugzilla.suse.com/show_bug.cgi?id=1182057

https://bugzilla.suse.com/show_bug.cgi?id=1182262

https://bugzilla.suse.com/show_bug.cgi?id=1182263

https://www.suse.com/security/cve/CVE-2020-14372/

https://www.suse.com/security/cve/CVE-2020-25632/

https://www.suse.com/security/cve/CVE-2020-25647/

https://www.suse.com/security/cve/CVE-2020-27749/

https://www.suse.com/security/cve/CVE-2020-27779/

https://www.suse.com/security/cve/CVE-2021-20225/

https://www.suse.com/security/cve/CVE-2021-20233/

http://www.nessus.org/u?85a28919

Plugin Details

Severity: High

ID: 146978

File Name: suse_SU-2021-0684-1.nasl

Version: 1.3

Type: local

Agent: unix

Published: 3/3/2021

Updated: 3/12/2021

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2021-20233

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:novell:suse_linux:grub2, p-cpe:/a:novell:suse_linux:grub2-debuginfo, p-cpe:/a:novell:suse_linux:grub2-debugsource, p-cpe:/a:novell:suse_linux:grub2-s390x-emu, cpe:/o:novell:suse_linux:15

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/SuSE/release, Host/SuSE/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 3/2/2021

Vulnerability Publication Date: 3/3/2021

Reference Information

CVE: CVE-2020-14372, CVE-2020-25632, CVE-2020-25647, CVE-2020-27749, CVE-2020-27779, CVE-2021-20225, CVE-2021-20233