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             AUSCERT External Security Bulletin Redistribution

        OpenSSL and Intel processor SMT side-channel vulnerability
                                29 May 2019


        AusCERT Security Bulletin Summary

Product:           F5 BIG-IP Products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Mitigation
CVE Names:         CVE-2018-5407  

Reference:         ESB-2018.3639

Original Bulletin: 

Revision History:  May      29 2019: Added 15.x branch
                   November 30 2018: Initial Release

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K49711130:OpenSSL and Intel processor SMT side-channel vulnerability (PortSmash) CVE-2018-5407

Security Advisory

Original Publication Date: 30 Nov, 2018

Latest   Publication Date: 29 May, 2019

Security Advisory Description

Simultaneous Multi-threading (SMT) in processors can enable local users to
exploit software vulnerable to timing attacks via a side-channel timing attack
on 'port contention.' (CVE-2018-5407 also known as PortSmash)


The vulnerability allows an attacker who can provide and run binary code of
their choosing on the F5 platform to steal secret cryptographic information.

Processes running on hyperthread-enabled cores are subject to a side-channel
attack by other processes running on the same core, if their program control
flow is impacted by private data. A common case for this behavior is
encryption, where the secret key can influence program flow. While
high-security contexts typically guard against this known behavior, a flaw in
OpenSSL's protection of elliptic curve processing is vulnerable to this class
of attack. Other encryption algorithms (RSA) are not affected, so
configurations that do not install EC keys are not impacted.

Note: Hyper-threading is Intel's implementation of SMT.

Security Advisory Status

F5 Product Development has assigned IDs 751143 and 751152 (BIG-IP), ID 751143-7
(BIG-IQ Centralized Management), ID 751143-8 (F5 iWorkflow),  ID 751143-9
(Enterprise Manager), and CPF-25013 and CPF-25014 (Traffix) to this

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 or   |
|                |      |be        |in        |        |1     |feature        |
|                |      |vulnerable|          |        |      |               |
|                |15.x  |None      |15.0.0    |        |      |               |
|                +------+----------+----------+        |      |               |
|BIG-IP (LTM,    |14.x  |14.0.0 -  |None      |        |      |OpenSSL EC     |
|AAM, AFM,       |      |14.1.0    |          |        |      |algorithm (LTM |
|Analytics, APM, +------+----------+----------+        |      |SSL profiles,  |
|ASM, DNS, Edge  |13.x  |13.0.0 -  |None      |        |      |iApps LX,      |
|Gateway, FPS,   |      |13.1.1    |          |Medium  |5.3   |iRules LX,     |
|GTM, Link       +------+----------+----------+        |      |big3d,         |
|Controller, PEM,|12.x  |12.1.0 -  |None      |        |      |Configuration  |
|WebAccelerator) |      |12.1.3    |          |        |      |utility), CPU  |
|                +------+----------+----------+        |      |               |
|                |11.x  |11.2.1 -  |None      |        |      |               |
|                |      |11.6.3    |          |        |      |               |
|Enterprise      |3.x   |3.1.1     |None      |Medium  |5.3   |OpenSSL EC     |
|Manager         |      |          |          |        |      |algorithm, CPU |
|                |6.x   |6.0.0 -   |None      |        |      |               |
|BIG-IQ          |      |6.0.1     |          |        |      |OpenSSL EC     |
|Centralized     +------+----------+----------+Medium  |5.3   |algorithm, CPU |
|Management      |5.x   |5.0.0 -   |None      |        |      |               |
|                |      |5.4.0     |          |        |      |               |
|F5 iWorkflow    |2.x   |2.3.0     |None      |Medium  |5.3   |OpenSSL EC     |
|                |      |          |          |        |      |algorithm, CPU |
|                |5.x   |5.0.0 -   |None      |        |      |               |
|Traffix SDC     |      |5.1.0     |          |Medium  |4.8   |OpenSSL EC     |
|                +------+----------+----------+        |      |algorithm, CPU |
|                |4.x   |4.4.0     |None      |        |      |               |

^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.

Vulnerable platforms


  o Virtual Edition

The following platforms when vCMP guests are deployed:

  o VIPRION B2100
  o VIPRION B2150
  o VIPRION B2250
  o VIPRION B4200
  o VIPRION B4300 blade in the 4400(J100) 4-slot chassis
  o VIPRION B4300 blade in the 4480(J102) 4-slot chassis
  o VIPRION B4300 blade in the 4800(S100) 8-slot chassis
  o VIPRION B4450 blade in the 4480(J102) 4-slot chassis
  o VIPRION B4450 blade in the 4800(S100) 8-slot chassis
  o BIG-IP 5200v
  o BIG-IP 5250v
  o BIG-IP 7200v
  o BIG-IP 7250v
  o BIG-IP 7255v
  o BIG-IP 10200v
  o BIG-IP 10250v
  o BIG-IP 10350v
  o BIG-IP 12250v
  o BIG-IP i5800
  o BIG-IP i5820-DF (FIPS)
  o BIG-IP i7800
  o BIG-IP i7820-DF (FIPS)
  o BIG-IP i10800
  o BIG-IP i11400-DS, i11600-DS, i11800-DS
  o BIG-IP i11800
  o BIG-IP i15800

BIG-IQ, F5 iWorkflow, Enterprise Manager, and Traffix

  o Virtual Edition/Virtual Platform

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.


To mitigate the vulnerability in multi-tenancy BIG-IP Virtual Clustered
Multiprocessing (vCMP) configurations, ensure that all guests are set to at
least two Cores Per Guest. Similarly, VE systems can be protected if the
hypervisor ensures that potentially hostile co-guests cannot be scheduled on
the same physical CPU.

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 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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