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AUSCERT External Security Bulletin Redistribution
ESB-2018.1944.2
K29146534: SBB Variant 4 vulnerability CVE-2018-3639
1 November 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP products
F5 Enterprise Manager
F5 BIG-IQ products
F5 iWorkflow
F5 Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Existing Account
Resolution: None
CVE Names: CVE-2018-3639
Reference: ASB-2018.0121
Original Bulletin:
https://support.f5.com/csp/article/K29146534
Revision History: November 1 2018: Additional vulnerable version of BIG-IP
products identified
July 4 2018: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
K29146534: SBB Variant 4 vulnerability CVE-2018-3639
Security Advisory
Original Publication Date: Jul 04, 2018
Updated Date: Nov 01, 2018
Security Advisory Description
Systems with microprocessors utilizing speculative execution and speculative
execution of memory reads before the addresses of all prior memory writes are
known may allow unauthorized disclosure of information to an attacker with
local user access via a side-channel analysis, aka Speculative Store Bypass
(SSB), Variant 4. (CVE-2018-3639)
Impact
All exposure is limited to the control plane, also known as the management
plane. There is no exposure on BIG-IP products by way of the data plane.
Additionally, on the control plane, the vulnerabilities are exploitable only by
the following four authorized, authenticated account roles: Administrator,
Resource Administrator, Manager, and iRules Manager. An attacker must be
authorized to access the system in one of these roles to attempt to exploit the
vulnerabilities.
This vulnerability requires an attacker who can provide and run binary code of
their choosing on the BIG-IP platform. As a result, these conditions severely
restrict the exposure risk of BIG-IP products.
Single-tenancy products
For single-tenancy products, such as a standalone BIG-IP device, the risk is
limited to a local, authorized user employing one of the vulnerabilities to
read information from memory that they would not normally access, exceeding
their privileges. A user may be able to access kernel-space memory, instead of
their own user-space.
Multi-tenancy environments
For multi-tenancy environments, such as cloud, Virtual Edition (VE), and
Virtual Clustered Multiprocessing (vCMP), the same local kernel memory access
risk applies as in single-tenancy environments. Additionally, there is a risk
of attacks across guests, or attacks against the hypervisor or host. In cloud
and VE environments, preventing these new attacks falls on the hypervisor or
host platform, which is outside the scope of F5's ability to support or patch.
Contact your cloud provider or hypervisor vendor to ensure their platforms or
products are protected against Spectre variants.
For vCMP environments, F5 believes that while the Spectre Variant attacks offer
a theoretical possibility of guest-to-guest or guest-to-host attacks, these
would be very difficult to successfully conduct in the BIG-IP environment. The
primary risk in the vCMP environment with Spectre variants only exists when
vCMP guests are configured to use a single core. If the vCMP guests are
configured to use two or more cores, the Spectre Variant vulnerabilities are
eliminated.
Vulnerability research
F5 is working with its hardware component vendors to determine the scope of
vulnerabilities across its various generations of hardware platforms. All of
the current information from F5's vendors is represented in this security
advisory. F5 is working to obtain the remaining information from its vendors
and will update the security advisory as F5 receives new information regarding
its hardware platforms.
F5 is also testing the fixes produced by the Linux community, and is conducting
an extensive test campaign to characterize the impact of the fixes on system
performance and stability to ensure a good experience for its customers. F5
does not want to rush the process and release fixes without a full
understanding of potential issues. Given the limited exposure, the complexity
of the fixes, and the potential issues, a detailed approach is warranted and
rushing a fix could result in an impact to system stability or unacceptable
performance costs. F5 will update this article with fixes as they become
available.
Security Advisory Status
F5 Product Development has assigned IDs 721319, 721555, and 721556 (BIG-IP), ID
721949 (BIG-IQ), ID 721945 (Enterprise Manager), and CPF-24903 and CPF-24904
(Traffix) 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 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 | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|AFM, Analytics, |13.x |13.0.0 - |None | | | |
|APM, ASM, DNS, Edge| |13.1.0 | | | |F5 |
|Gateway, FPS, GTM, +------+----------+----------+Medium |5.6 |hardware |
|Link Controller, |12.x |12.1.0 - |None | | |platforms*|
|PEM, | |12.1.3 | | | | |
|WebAccelerator) +------+----------+----------+ | | |
| |11.x |11.2.1 - |None | | | |
| | |11.6.3 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
|ARX |6.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
| | | | | | |F5 |
|Enterprise Manager |3.x |3.1.1 |None |Medium |4.3 |hardware |
| | | | | | |platforms*|
+-------------------+------+----------+----------+----------+------+----------+
| |6.x |6.0.0 |None | | | |
| +------+----------+----------+ | |F5 |
|BIG-IQ Centralized |5.x |5.0.0 - |None |Medium |4.3 |hardware |
|Management | |5.4.0 | | | |platforms*|
| +------+----------+----------+ | | |
| |4.x |4.6.0 |None | | | |
+-------------------+------+----------+----------+----------+------+----------+
|BIG-IQ Cloud and | | | | | |F5 |
|Orchestration |1.x |1.0.0 |None |Medium |4.3 |hardware |
| | | | | | |platforms*|
+-------------------+------+----------+----------+----------+------+----------+
| | |2.1.0 - | | | |F5 |
|F5 iWorkflow |2.x |2.3.0 |None |Medium |4.3 |hardware |
| | | | | | |platforms*|
+-------------------+------+----------+----------+----------+------+----------+
| |5.x |5.0.0 - |None | | |F5 |
|Traffix SDC | |5.1.0 | |Medium |5.6 |hardware |
| +------+----------+----------+ | |platforms*|
| |4.x |4.4.0 |None | | | |
+-------------------+------+----------+----------+----------+------+----------+
^1 The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.
* For information about the affected hardware platforms, refer to the
Vulnerable platforms section.
Vulnerable platforms
Some platforms may have processors from multiple vendors and may have a
vulnerable ARM processor in one or more subsystems. F5 investigated the use of
ARM processors and, while vulnerable processors are used, those processors do
not handle privileged information; they are limited to running signed firmware
from F5 with no capability to execute user-specified code.
The following tables list only one entry for platform models that have several
variants. For example, BIG-IP 11000, BIG-IP 11050, BIG-IP 11050F, and BIG-IP
11050N are all vulnerable and included in the table as "BIG-IP 110x0."
BIG-IP
+-------------+---------------+----------+
|Model |Processor types|Vulnerable|
+-------------+---------------+----------+
|VIPRION B21x0|Intel |Y |
+-------------+---------------+----------+
|VIPRION B2250|Intel |Y |
+-------------+---------------+----------+
|VIPRION B4100|AMD |Y* |
+-------------+---------------+----------+
|VIPRION B4200|AMD |Y* |
+-------------+---------------+----------+
|VIPRION B43x0|Intel |Y |
+-------------+---------------+----------+
|VIPRION B44x0|Intel |Y |
+-------------+---------------+----------+
|BIG-IP 2xx0 |Intel |Y |
+-------------+---------------+----------+
|BIG-IP 4xx0 |Intel |Y |
+-------------+---------------+----------+
|BIG-IP 5xx0 |Intel |Y |
+-------------+---------------+----------+
|BIG-IP 7xx0 |Intel |Y |
+-------------+---------------+----------+
|BIG-IP 10xxx |Intel |Y |
+-------------+---------------+----------+
|BIG-IP 12xx0 |Intel |Y |
+-------------+---------------+----------+
|BIG-IP i2x00 |Intel, ARM |Y |
+-------------+---------------+----------+
|BIG-IP i4x00 |Intel, ARM |Y |
+-------------+---------------+----------+
|BIG-IP i5x00 |Intel, ARM |Y |
+-------------+---------------+----------+
|BIG-IP i7x00 |Intel, ARM |Y |
+-------------+---------------+----------+
|BIG-IP i10x00|Intel, ARM |Y |
+-------------+---------------+----------+
|BIG-IP 800 |Intel |Y |
+-------------+---------------+----------+
|BIG-IP 1600 |Intel |Y |
+-------------+---------------+----------+
|BIG-IP 3600 |Intel |Y |
+-------------+---------------+----------+
|BIG-IP 3900 |Intel |Y |
+-------------+---------------+----------+
|BIG-IP 6900 |AMD |Y* |
+-------------+---------------+----------+
|BIG-IP 89x0 |AMD |Y* |
+-------------+---------------+----------+
|BIG-IP 110x0 |AMD |Y* |
+-------------+---------------+----------+
|BIG-IP 6400 |AMD |Y* |
+-------------+---------------+----------+
* F5 believes these platforms are vulnerable, but AMD has yet to confirm. AMD
has not published plans to provide fixes for these CPUs.
BIG-IQ, Enterprise Manager, FirePass, and ARX
+-----------------------+--------------+----------+
|Model |Processor type|Vulnerable|
+-----------------------+--------------+----------+
|BIG-IQ 7000 |Intel |Y |
+-----------------------+--------------+----------+
|Enterprise Manager 4000|Intel |Y |
+-----------------------+--------------+----------+
|FirePass 12xx |Intel |N |
+-----------------------+--------------+----------+
|FirePass 41xx |AMD |Y* |
+-----------------------+--------------+----------+
|FirePass 43xx |AMD |Y* |
+-----------------------+--------------+----------+
|ARX 1500+ |Intel |Y |
+-----------------------+--------------+----------+
|ARX 2500 |Intel |Y |
+-----------------------+--------------+----------+
|ARX 4000/4000+ |Intel |Y |
+-----------------------+--------------+----------+
* Intel and AMD have not responded to repeated requests for information about
the processors in these platforms. Therefore, based on their general public
statements, we must assume that they are vulnerable.
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
None
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 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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