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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.1764
              Rowhammer hardware vulnerability CVE-2020-10255
                                19 May 2020

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           BIG-IP iSeries
                   VIPRION B4450 blades
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Increased Privileges -- Existing Account
                   Denial of Service    -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-10255  

Original Bulletin: 
   https://support.f5.com/csp/article/K60570139

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K60570139:Rowhammer hardware vulnerability CVE-2020-10255

Security Advisory

Original Publication Date: 19 May, 2020

Security Advisory Description

Modern DRAM chips (DDR4 and LPDDR4 after 2015) are affected by a vulnerability
in deployment of internal mitigations against RowHammer attacks known as Target
Row Refresh (TRR), aka the TRRespass issue. To exploit this vulnerability, the
attacker needs to create certain access patterns to trigger bit flips on
affected memory modules, aka a Many-sided RowHammer attack. This means that,
even when chips advertised as RowHammer-free are used, attackers may still be
able to conduct privilege-escalation attacks against the kernel, conduct
privilege-escalation attacks against the Sudo binary, and achieve cross-tenant
virtual-machine access by corrupting RSA keys. The issue affects chips produced
by SK Hynix, Micron, and Samsung. NOTE: tracking DRAM supply-chain issues is
not straightforward because a single product model from a single vendor may use
DRAM chips from different manufacturers. (CVE-2020-10255)

Impact

This vulnerability impacts BIG-IP iSeries platforms and VIPRION B4450 blades
only.

An unprivileged system user may leverage this flaw and use rowhammer attack
variants to induce bit corruptions across memory space, potentially resulting
in a denial of service or privileges escalation scenarios. The highest threat
from this vulnerability is to system availability.

Security Advisory Status

F5 Product Development has assigned ID 909345 (BIG-IP) 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      |          |      |          |
|                   |      |15.1.0    |          |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |14.x  |14.1.0 -  |None      |          |      |          |
|BIG-IP (LTM, AAM,  |      |14.1.2    |          |          |      |          |
|AFM, Analytics,    +------+----------+----------+          |      |          |
|APM, ASM, DNS, FPS,|13.x  |13.1.0 -  |None      |Medium    |6.5   |Hardware: |
|GTM, Link          |      |13.1.3    |          |          |      |DRAM chips|
|Controller, PEM)   +------+----------+----------+          |      |          |
|                   |12.x  |12.1.0 -  |None      |          |      |          |
|                   |      |12.1.5    |          |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |11.x  |11.6.1 -  |None      |          |      |          |
|                   |      |11.6.5    |          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |7.x   |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
|                   +------+----------+----------+          |      |          |
|BIG-IQ Centralized |6.x   |None      |Not       |Not       |None  |None      |
|Management         |      |          |applicable|vulnerable|      |          |
|                   +------+----------+----------+          |      |          |
|                   |5.x   |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|Traffix SDC        |5.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
+-------------------+------+----------+----------+----------+------+----------+

^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

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 K13123: Managing BIG-IP product hotfixes (11.x - 15.x)
  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

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