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             AUSCERT External Security Bulletin Redistribution

       Citrix ADC and Citrix Gateway Security Update (CVE-2019-0140)
                              23 October 2020


        AusCERT Security Bulletin Summary

Product:           Citrix Application Delivery Controller (ADC)
                   Citrix Gateway
Publisher:         Citrix
Operating System:  Network Appliance
Impact/Access:     Increased Privileges -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-0140  

Reference:         ASB-2019.0320

Original Bulletin: 

Revision History:  October  23 2020: Vendor issued updated guidance
                   November 15 2019: Initial Release

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Citrix ADC and Citrix Gateway Security Update (CVE-2019-0140)

Reference: CTX263807

Category : High

Created  : 12 Nov 2019

Modified : 21 Oct 2020

Applicable Products

  o Citrix ADC
  o Citrix Gateway

Description of Problem

A vulnerability has been identified affecting Citrix Application Delivery
Controller (ADC) formerly known as NetScaler ADC, and Citrix Gateway, formerly
known as NetScaler Gateway, platforms which could result in privilege
escalation via layer 2 network access on all network interfaces.

This vulnerability has been assigned the following CVE:

o CVE-2019-0140: Buffer overflow in firmware for Intel(R) Ethernet 700 Series

The following MPX/SDX series are affected:

o 8900

o 14000-40G/14000-40S/14000-40C

o 15000-25G/15000-50G

o 25000-40G

o 26000/26000-50G

Only 10G/25G/40G ports are affected by this vulnerability.

Mitigating Factors

An attacker must have Layer 2 access to leverage this vulnerability, therefore
limiting the exposure to peer switch access. This issue is mitigated if Link
Layer Discovery Protocol (LLDP) is disabled at the peer switch connecting the

What Customers Should Do

Customers with affected versions of Citrix ADC MPX are recommended to upgrade
the appliance firmware to one of the following versions:

  o 13.0 build 58.30 and later
  o 12.1 build 56.22 and later
  o 11.1 build 64.11 and later

Customers must then upgrade the network interface card firmware by following
the guidance in the following article: https://docs.citrix.com/en-us/
citrix-hardware-platforms/mpx/fortville-nic-firmware-upgrade.html .

Please note that after the network interface card firmware version is upgraded
on the MPX, customers can no longer downgrade the appliance firmware to
anything before the aforementioned versions.

Customers with affected versions of Citrix ADC SDX are recommended to upgrade
the appliance firmware to a version which includes a firmware update for the
vulnerable network interface card:

  o 13.0 build 58.30 and later
  o 12.1 build 57.18 and later
  o 11.1 build 65.10 and later

Please note, that customers must first upgrade any VPX instances running on the
appliance and then upgrade the SVM. More details are available in the following
article: https://docs.citrix.com/en-us/citrix-hardware-platforms/sdx/
fortville-nic-firmware-upgrade-on-sdx.html .

Alternatively, customers who are unable to upgrade are strongly recommended to
Disable Link Layer Discovery Protocol (LLDP) at the peer switch connecting the


|Date                      |Change                                            |
|2019-11-12                |Initial Publication                               |
|2020-10-21                |Updated guidance                                  |

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