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             AUSCERT External Security Bulletin Redistribution

            K00854051:Linux kernel vulnerability CVE-2018-13405
                                14 May 2019


        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

Original Bulletin: 

Revision History:  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: 14 May, 2019

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)


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|          |        |      |          |
|                     |14.x  |14.0.0 -  |None      |        |      |          |
|                     |      |14.1.0    |          |        |      |          |
|BIG-IP (LTM, AAM,    +------+----------+----------+        |      |          |
|AFM, Analytics, APM, |13.x  |13.0.0 -  |None      |        |      |          |
|ASM, DNS, Edge       |      |13.1.1    |          |        |      |Linux     |
|Gateway, FPS, GTM,   +------+----------+----------+Medium  |4.4   |kernel    |
|Link Controller, PEM,|12.x  |12.1.0 -  |None      |        |      |(BaseOS)  |
|WebAccelerator)      |      |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.


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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