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AUSCERT External Security Bulletin Redistribution
ESB-2024.0085
K000132893 : GRUB2 vulnerability CVE-2022-28733
3 January 2024
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP (all modules)
BIG-IQ Centralized Management
F5OS-A
F5OS-C
Publisher: F5 Networks
Operating System: Network Appliance
Resolution: Mitigation
CVE Names: CVE-2022-28733
Original Bulletin:
https://my.f5.com/manage/s/article/K000132893
Comment: CVSS (Max): 8.1 CVE-2022-28733 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: NIST
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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K000132893: GRUB2 vulnerability CVE-2022-28733
Published Date: Mar 8, 2023
Updated Date: Jan 2, 2024
Security Advisory Description
Integer underflow in grub_net_recv_ip4_packets; A malicious crafted IP packet
can lead to an integer underflow in grub_net_recv_ip4_packets() function on
rsm->total_len value. Under certain circumstances the total_len value may end
up wrapping around to a small integer number which will be used in memory
allocation. If the attack succeeds in such way, subsequent operations can write
past the end of the buffer. (CVE-2022-28733)
Impact
This flaw allows an attacker to craft a malicious packet, triggering an integer
underflow in grub code. Consequently, the memory allocation for handling the
packet data may be smaller than the size needed. This issue causes an
out-of-bands write during packet handling, compromising data integrity,
confidentiality issues, a denial of service, and remote code execution.
Security Advisory Status
F5 Product Development has assigned ID 1209209 (BIG-IP), ID 1209209-7 (BIG-IQ),
and ID 1207749-1 (F5OS) to this vulnerability.
To determine if your product and version have been evaluated for this
vulnerability, refer to the Evaluated products box. To determine if your
release is known to be vulnerable, the components or features that are affected
by the vulnerability, and for information about releases, point releases, or
hotfixes that address the vulnerability, refer to the following tables. You can
also use iHealth to diagnose a vulnerability for BIG-IP and BIG-IQ systems. For
more information about using iHealth, refer to K27404821: Using F5 iHealth to
diagnose vulnerabilities. For more information about security advisory
versioning, refer to K51812227: Understanding security advisory versioning.
In this section
o BIG-IP and BIG-IQ
o F5OS
o NGINX
o Other products
BIG-IP and BIG-IQ
Note: After a fix is introduced for a given minor branch, that fix applies to
all subsequent maintenance and point releases for that branch, and no
additional fixes for that branch will be listed in the table. For example, when
a fix is introduced in 14.1.2.3, the fix also applies to 14.1.2.4, and all
later 14.1.x releases (14.1.3.x., 14.1.4.x). For more information, refer to
K51812227: Understanding security advisory versioning.
+------------+------+--------------+----------+----------+------+-------------+
| | |Versions known|Fixes | |CVSSv3|Vulnerable |
|Product |Branch|to be |introduced|Severity |score^|component or |
| | |vulnerable^1 |in | |2 |feature |
+------------+------+--------------+----------+----------+------+-------------+
| |17.x |17.0.0 - |None | | | |
| | |17.1.1 | | | | |
| +------+--------------+----------+ | | |
| |16.x |16.1.0 - |None | | | |
| | |16.1.3 | | | | |
| +------+--------------+----------+ | | |
|BIG-IP (all |15.x |15.1.0 - |None |High |8.1 |GRUB2 |
|modules) | |15.1.8 | | | | |
| +------+--------------+----------+ | | |
| |14.x |14.1.0 - |Will not | | | |
| | |14.1.5 |fix | | | |
| +------+--------------+----------+ | | |
| |13.x |13.1.0 - |Will not | | | |
| | |13.1.5 |fix | | | |
+------------+------+--------------+----------+----------+------+-------------+
|BIG-IP SPK |All |None |None |Not |None |None |
| | | | |vulnerable| | |
+------------+------+--------------+----------+----------+------+-------------+
|BIG-IQ |8.x |8.0.0 - 8.2.0 |None | | | |
|Centralized +------+--------------+----------+High |8.1 |GRUB2 |
|Management |7.x |7.1.0 |None | | | |
+------------+------+--------------+----------+----------+------+-------------+
^1F5 evaluates only software versions that have not yet reached the End of
Technical Support (EoTS) phase of their lifecycle. For more information, refer
to the Security hotfixes section of K4602: Overview of the F5 security
vulnerability response policy.
^2The CVSSv3 score link takes you to a resource outside of MyF5 and it is
possible that the document may be removed without our knowledge.
F5OS
+-------+------+-----------------+----------+--------+-------+----------------+
| | |Versions known to|Fixes | |CVSSv3 |Vulnerable |
|Product|Branch|be vulnerable^1 |introduced|Severity|score^2|component or |
| | | |in | | |feature |
+-------+------+-----------------+----------+--------+-------+----------------+
|F5OS-A |1.x |1.3.0 - 1.3.1 |None |Medium |6.4 |GRUB2 |
+-------+------+-----------------+----------+--------+-------+----------------+
|F5OS-C |1.x |1.5.0 - 1.5.1 |None |Medium |6.4 |GRUB2 |
| | |1.3.0 - 1.3.2 | | | | |
+-------+------+-----------------+----------+--------+-------+----------------+
^1F5 evaluates only software versions that have not yet reached the End of
Technical Support (EoTS) phase of their lifecycle. For more information, refer
to the Security hotfixes section of K4602: Overview of the F5 security
vulnerability response policy.
^2The CVSSv3 score link takes you to a resource outside of MyF5 and it is
possible that the document may be removed without our knowledge.
NGINX
+---------+------+---------------+----------+----------+------+---------------+
| | |Versions known |Fixes | |CVSSv3|Vulnerable |
|Product |Branch|to be |introduced|Severity |score^|component or |
| | |vulnerable^1 |in | |2 |feature |
+---------+------+---------------+----------+----------+------+---------------+
|NGINX | | |Not |Not | | |
|(all |All |None |applicable|vulnerable|None |None |
|products)| | | | | | |
+---------+------+---------------+----------+----------+------+---------------+
^1F5 evaluates only software versions that have not yet reached the End of
Technical Support (EoTS) phase of their lifecycle. For more information, refer
to the Security hotfixes section of K4602: Overview of the F5 security
vulnerability response policy.
^2The CVSSv3 score link takes you to a resource outside of MyF5, and it is
possible that the document may be removed without our knowledge.
Other products
+-------+------+----------------+----------+----------+-------+---------------+
| | |Versions known |Fixes | |CVSSv3 |Vulnerable |
|Product|Branch|to be vulnerable|introduced|Severity |score^2|component or |
| | |^1 |in | | |feature |
+-------+------+----------------+----------+----------+-------+---------------+
|Traffix|All |None |Not |Not |None |None |
|SDC | | |applicable|vulnerable| | |
+-------+------+----------------+----------+----------+-------+---------------+
^1F5 evaluates only software versions that have not yet reached the End of
Technical Support (EoTS) phase of their lifecycle. For more information, refer
to the Security hotfixes section of K4602: Overview of the F5 security
vulnerability response policy.
^2The CVSSv3 score link takes you to a resource outside of MyF5, and it is
possible that the document may be removed without our knowledge.
Security Advisory Recommended Actions
If you are running a version listed in the Versions known to be vulnerable
column, you can eliminate this vulnerability by installing a version listed in
the Fixes introduced in column. If the Fixes introduced in column does not list
a version for your branch, then no update candidate currently exists for that
branch and F5 recommends that you upgrade to a version with the fix (refer to
the tables).
If the Fixes introduced in column lists a version prior to the one you are
running, in the same branch, then your version should have the fix.
Mitigation
To mitigate this vulnerability for affected F5 products, you should restrict
management access to F5 products to only trusted users and devices over a
secure network. For more information about securing access to BIG-IP systems,
refer to the following articles:
o K13309: Restricting access to the Configuration utility by source IP
address (11.x - 17.x)
o K13092: Overview of securing access to the BIG-IP system
o K46122561: Restrict access to the BIG-IP management interface using network
firewall rules
Related Content
o K41942608: Overview of security advisory articles
o K12201527: Overview of Quarterly Security Notifications
o K51812227: Understanding security advisory versioning
o K4602: Overview of the F5 security vulnerability response policy
o K4918: Overview of the F5 critical issue hotfix policy
o K39757430: F5 product and services lifecycle policy index
o K9502: BIG-IP hotfix and point release matrix
o K13123: Managing BIG-IP product hotfixes (11.x - 17.x)
o K15106: Managing BIG-IQ product hotfixes
o K15113: BIG-IQ hotfix and point release matrix
o K48955220: Installing an OPSWAT Endpoint Security update on BIG-IP APM
systems (11.4.x and later)
o K167: Downloading software and firmware from F5
o K9970: Subscribing to email notifications regarding F5 products
o K9957: Creating a custom RSS feed to view new and updated documents
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The University of Queensland
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Internet Email: auscert@auscert.org.au
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