Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2021.2535
Security Bulletin: GRUB2 as used by IBM QRadar SIEM is
vulnerable to arbitrary code execution
27 July 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: IBM QRadar SIEM
Publisher: IBM
Operating System: Linux variants
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Unauthorised Access -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-20233 CVE-2021-20225 CVE-2021-3418
CVE-2020-27779 CVE-2020-27749 CVE-2020-25647
CVE-2020-25632 CVE-2020-14372
Reference: ESB-2021.2468
ESB-2021.2263
ESB-2021.2178
ESB-2021.0753
ESB-2021.0748
Original Bulletin:
https://www.ibm.com/support/pages/node/6475265
- --------------------------BEGIN INCLUDED TEXT--------------------
Security Bulletin: GRUB2 as used by IBM QRadar SIEM is vulnerable to arbitrary
code execution
Document Information
Product: IBM QRadar SIEM
Software version: 7.3, 7.4
Operating system(s): Linux
Document number: 6475265
Modified date: 26 July 2021
Summary
GRUB2 as used by IBM QRadar SIEM is vulnerable to arbitrary code execution
Vulnerability Details
CVEID: CVE-2021-20225
DESCRIPTION: GNU GRUB2 could allow a local authenticated attacker to execute
arbitrary code on the system, caused by a heap out-of-bounds write flaw in the
short form option parser. By sending specially-crafted commands, an attacker
could exploit this vulnerability to execute arbitrary code on the system.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
197608 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H)
CVEID: CVE-2020-25632
DESCRIPTION: GNU GRUB2 could allow a local authenticated attacker to execute
arbitrary code on the system, caused by a use-after-free flaw in the rmmod
implementation. By sending a specially-crafted request, an attacker could
exploit this vulnerability to execute arbitrary code and bypass Secure Boot
protections.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
197604 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H)
CVEID: CVE-2021-20233
DESCRIPTION: GNU GRUB2 could allow a local authenticated attacker to execute
arbitrary code on the system, caused by a heap out-of-bounds write flaw due to
miscalculation of space required for quoting. By sending a specially-crafted
request, an attacker could exploit this vulnerability to execute arbitrary code
on the system.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
197616 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H)
CVEID: CVE-2020-25647
DESCRIPTION: GNU GRUB2 could allow a physical authenticated attacker to
execute arbitrary code on the system, caused by an out-of-bound write flaw in
the grub_usb_device_initialize function. By using a specially-crafted USB
device, an attacker could exploit this vulnerability to execute arbitrary code
and bypass Secure Boot protections.
CVSS Base score: 6.9
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
197605 for the current score.
CVSS Vector: (CVSS:3.0/AV:P/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H)
CVEID: CVE-2021-3418
DESCRIPTION: GNU GRUB2 could allow a local authenticated attacker to bypass
security restrictions, caused by improper validation of kernel signature when
booted directly without shim. By sending a specially-crafted request, an
attacker could exploit this vulnerability to bypass secure boot to boot any
kernel.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
197617 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H)
CVEID: CVE-2020-27749
DESCRIPTION: GNU GRUB2 is vulnerable to a stack-based buffer overflow, caused
by improper bounds checking by the rub_parser_split_cmdline function. By
sending a specially-crafted request, a local authenticated attacker could
overflow a buffer and execute arbitrary code and bypass Secure Boot
protections.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
197606 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H)
CVEID: CVE-2020-14372
DESCRIPTION: GNU GRUB2 could allow a local authenticated attacker to execute
arbitrary code on the system, caused by improper input validation by the acpi
command. By using specially-crafted ACPI tables, an attacker could exploit this
vulnerability to load unsigned kernel modules and execute arbitrary kexec
unsigned on the system.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
197603 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H)
CVEID: CVE-2020-27779
DESCRIPTION: GNU GRUB2 could allow a local authenticated attacker to bypass
security restrictions, caused by the failure to honor Secure Boot locking in
the cutmem command. By sending a specially-crafted request, an attacker could
exploit this vulnerability to remove address ranges from memory and bypass
Secure Boot protections.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
197607 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H)
Affected Products and Versions
IBM QRadar SIEM 7.3.0 to 7.3.3 Patch 8
IBM QRadar SIEM 7.4.0 to 7.4.3 GA
Remediation/Fixes
QRadar / QRM / QVM / QRIF / QNI 7.3.3 Patch 9
QRadar / QRM / QVM / QRIF / QNI 7.4.3 Patch 1
Workarounds and Mitigations
None
Change History
21 Jul 2021: Initial Publication
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=IWX5
-----END PGP SIGNATURE-----