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AUSCERT External Security Bulletin Redistribution
ESB-2019.1636.3
K00854051:Linux kernel vulnerability CVE-2018-13405
19 October 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 Products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Increased Privileges -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Mitigation
CVE Names: CVE-2018-13405
Reference: ASB-2019.0002
ESB-2019.1213
ESB-2018.3020
ESB-2018.2716
Original Bulletin:
https://support.f5.com/csp/article/K00854051
Revision History: October 19 2020: Fixed versions added to advisory
May 14 2019: Added heuristic information for BIG-IP iHealth
May 10 2019: Initial Release
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K00854051:Linux kernel vulnerability CVE-2018-13405
Security Advisory
Original Publication Date: 10 May, 2019
Latest Publication Date: 16 Oct, 2020
Security Advisory Description
The inode_init_owner function in fs/inode.c in the Linux kernel through 4.17.4
allows local users to create files with an unintended group ownership, in a
scenario where a directory is SGID to a certain group and is writable by a user
who is not a member of that group. Here, the non-member can trigger creation of
a plain file whose group ownership is that group. The intended behavior was
that the non-member can trigger creation of a directory (but not a plain file)
whose group ownership is that group. The non-member can escalate privileges by
making the plain file executable and SGID. (CVE-2018-13405)
Impact
Local users are able to create files with an unintended group ownership,
allowing attackers to escalate privileges and obtain sensitive information that
may aid in further attacks.
Security Advisory Status
F5 Product Development has assigned ID 778049 (BIG-IP and BIG-IQ), and ID
CPF-25082 and CPF-25083 (Traffix SDC) to this vulnerability. Additionally,
BIG-IP iHealth may list Heuristic H00854051 on the Diagnostics > Identified >
Medium page.
To determine if your product and version have been evaluated for this
vulnerability, refer to the Applies to (see versions) 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 or hotfixes that
address the vulnerability, refer to the following table. For more information
about security advisory versioning, refer to K51812227: Understanding Security
Advisory versioning.
+---------------------+------+----------+----------+--------+------+----------+
| | |Versions |Fixes | |CVSSv3|Vulnerable|
|Product |Branch|known to |introduced|Severity|score^|component |
| | |be |in | |1 |or feature|
| | |vulnerable| | | | |
+---------------------+------+----------+----------+--------+------+----------+
| |16.x |16.0.0 |None | | | |
| +------+----------+----------+ | | |
| |15.x |15.1.0 |15.1.1 | | | |
| | |15.0.0 |15.0.1.4 | | | |
| +------+----------+----------+ | | |
|BIG-IP (LTM, AAM, |14.x |14.0.0 - |None | | | |
|AFM, Analytics, APM, | |14.1.0 | | | |Linux |
|ASM, DNS, Edge +------+----------+----------+Medium |4.4 |kernel |
|Gateway, FPS, GTM, |13.x |13.0.0 - |None | | |(BaseOS) |
|Link Controller, PEM,| |13.1.1 | | | | |
|WebAccelerator) +------+----------+----------+ | | |
| |12.x |12.1.0 - |None | | | |
| | |12.1.4 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.5.2 - |None | | | |
| | |11.6.4 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
| | | | | | |Linux |
|Enterprise Manager |3.x |3.1.1 |None |Medium |4.4 |kernel |
| | | | | | |(BaseOS) |
+---------------------+------+----------+----------+--------+------+----------+
| |6.x |6.0.0 - |None | | | |
|BIG-IQ Centralized | |6.1.0 | | | |Linux |
|Management +------+----------+----------+Medium |4.4 |kernel |
| |5.x |5.0.0 - |None | | |(BaseOS) |
| | |5.4.0 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
| | | | | | |Linux |
|F5 iWorkflow |2.x |2.3.0 |None |Medium |4.4 |kernel |
| | | | | | |(BaseOS) |
+---------------------+------+----------+----------+--------+------+----------+
| | |5.0.0 - | | | |Linux |
|Traffix SDC |5.x |5.1.0 |None |Medium |4.4 |kernel |
| | | | | | |(BaseOS) |
+---------------------+------+----------+----------+--------+------+----------+
^1The CVSSv3 score link takes you to a resource outside of AskF5, 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 upgrading to a version listed
in the Fixes introduced in column. If the table lists only an older version
than what you are currently running, or does not list a non-vulnerable version,
then no upgrade candidate currently exists.
Mitigation
BIG-IP, BIG-IQ, iWorkflow, and Enterprise Manager
To mitigate this vulnerability, you should permit connectivity access to the
affected F5 products only over a secure network and restrict access for the
affected systems to only trusted users. For more information, refer to the
following articles:
o K13309: Restricting access to the Configuration utility by source IP
address (11.x - 14.x)
o K13092: Overview of securing access to the BIG-IP system
o K31401771: Restricting access to the BIG-IQ or F5 iWorkflow user interface
by source IP address
o K39403510: Managing the port lockdown configuration on the BIG-IQ system
Supplemental Information
o K51812227: Understanding Security Advisory versioning
o K41942608: Overview of Security Advisory articles
o K4602: Overview of the F5 security vulnerability response policy
o K4918: Overview of the F5 critical issue hotfix policy
o K9502: BIG-IP hotfix and point release matrix
o K13123: Managing BIG-IP product hotfixes (11.x - 13.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
o K21232150: Considerations for upgrading BIG-IQ or F5 iWorkflow systems
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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.
===========================================================================
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