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AUSCERT External Security Bulletin Redistribution
ESB-2019.0578
Linux kernel vulnerability CVE-2018-10883
26 February 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-10883
Original Bulletin:
https://support.f5.com/csp/article/K94735334
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K94735334:Linux kernel vulnerability CVE-2018-10883
Security Advisory
Original Publication Date: 21 Feb, 2019
Latest Publication Date: 26 Feb, 2019
Security Advisory Description
A flaw was found in the Linux kernel's ext4 filesystem. A local user can cause
an out-of-bounds write in jbd2_journal_dirty_metadata(), a denial of service,
and a system crash by mounting and operating on a crafted ext4 filesystem
image. (CVE-2018-10883)
Impact
A local user may be able to obtain sensitive information to cause a
denial-of-service (DoS) attack and disrupt service by using a crafted ext4
filesystem image.
Security Advisory Status
F5 Product Development has assigned ID 755674 (BIG-IP) to this vulnerability.
Additionally, BIG-IP iHealth may list Heuristic H94735334 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| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |14.x |14.0.0 - |None | | | |
| | |14.1.0 | | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|AFM, Analytics, |13.x |13.0.0 - |None | | | |
|APM, ASM, DNS, Edge| |13.1.1 | | | |Linux |
|Gateway, FPS, GTM, +------+----------+----------+Medium |5.5 |kernel |
|Link Controller, |12.x |None |Not | | | |
|PEM, | | |applicable| | | |
|WebAccelerator) +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
| |6.x |None |Not | | | |
|BIG-IQ Centralized | | |applicable|Not | | |
|Management +------+----------+----------+vulnerable|None |None |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|F5 iWorkflow |2.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
| |5.x |None |Not | | | |
| | | |applicable|Not | | |
|Traffix SDC +------+----------+----------+vulnerable|None |None |
| |4.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
^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 access to the system only
over a secure network and limit login access to only trusted users. For more
information, refer to K13309: Restricting access to the Configuration utility
by source IP address (11.x - 14.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
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