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AUSCERT External Security Bulletin Redistribution
ESB-2019.3890.2
Linux kernel vulnerability CVE-2017-18551
1 November 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP
F5 BIG-IQ
F5 Enterprise Manager
F5 iWorkflow
F5 Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Mitigation
CVE Names: CVE-2017-18551
Reference: ESB-2019.3835
ESB-2019.3817
ESB-2019.3570
ESB-2019.3380
Original Bulletin:
https://support.f5.com/csp/article/K48073202
Revision History: November 1 2019: Mitigation advise provided
October 18 2019: Initial Release
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K48073202: Linux kernel vulnerability CVE-2017-18551
Security Advisory
Original Publication Date: Oct 11, 2019
Updated Date: Nov 01, 2019
Security Advisory Description
An issue was discovered in drivers/i2c/i2c-core-smbus.c in the Linux kernel
before 4.14.15. There is an out of bounds write in the function
i2c_smbus_xfer_emulated. (CVE-2017-18551).
Impact
This vulnerability may allow an attacker to overwrite memory beyond the
intended buffer.
Security Advisory Status
F5 Product Development has assigned ID 832757 (BIG-IP), ID 832757-7 (BIG-IQ),
ID 832757-8 (Enterprise Manager), ID 832757-9 (iWorkflow), and CPF-25145
(Traffic SDC) to this vulnerability.
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, point 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| | | | |
+---------------------+------+----------+----------+--------+------+----------+
| |15.x |15.0.0 - |None | | | |
| | |15.0.1 | | | | |
| +------+----------+----------+ | | |
| |14.x |14.0.0 - |None | | | |
|BIG-IP (LTM, AAM, | |14.1.2 | | | | |
|AFM, Analytics, APM, +------+----------+----------+ | | |
|ASM, DNS, Edge |13.x |13.1.0 - |None |Medium |6.2 |Linux |
|Gateway, FPS, GTM, | |13.1.3 | | | |kernel |
|Link Controller, PEM,+------+----------+----------+ | | |
|WebAccelerator) |12.x |12.1.0 - |None | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.5.2 - |None | | | |
| | |11.6.5 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
|Enterprise Manager |3.x |3.1.1 |None |Medium |6.2 |Linux |
| | | | | | |kernel |
+---------------------+------+----------+----------+--------+------+----------+
| |7.x |7.0.0 |None | | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized |6.x |6.0.0 - |None | | |Linux |
|Management | |6.1.0 | |Medium |6.2 |kernel |
| +------+----------+----------+ | | |
| |5.x |5.2.0 - |None | | | |
| | |5.4.0 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
|F5 iWorkflow |2.x |2.3.0 |None |Medium |6.2 |Linux |
| | | | | | |kernel |
+---------------------+------+----------+----------+--------+------+----------+
|Traffix SDC |5.x |5.0.0 - |None |Medium |6.2 |Linux |
| | |5.1.0 | | | |kernel |
+---------------------+------+----------+----------+--------+------+----------+
^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
To mitigate this vulnerability, you should permit management access to F5
products only over a secure network and restrict command line access for
affected systems to only trusted users. For more information, refer to K13309:
Restricting access to the Configuration utility by source IP address (11.x -
15.x) and K13092: Overview of securing access to the BIG-IP 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 - 15.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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