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Security Bulletin: GRUB2 as used by IBM QRadar SIEM is vulnerable to arbitrary code execution

Security Bulletin


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




Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

References

Off

Change History

21 Jul 2021: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

Document Location

Worldwide

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Document Information

Modified date:
26 July 2021

UID

ibm16475265