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             AUSCERT External Security Bulletin Redistribution

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


        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: 

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

Reference: CTX263807

Category : High

Created  : 12 Nov 2019

Modified : 12 Nov 2019

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 exposure to peer switch access. Link Layer Discovery Protocol (LLDP)
being disabled at the peer switch connecting the MPX/SDX mitigates the issue.

What Customers Should Do

Disable Link Layer Discovery Protocol (LLDP) at the peer switch connecting the

Citrix intends to remove this requirement in future builds which are expected
to also include a firmware update for the network interface cards.

Citrix recommends that affected customers immediately apply the provided
mitigation and upgrade all of their vulnerable appliances to a fixed version of
the appliance firmware when released. Subscribe to bulletin alerts at https://
support.citrix.com/user/alerts to be notified when the new firmware is


|Date                                 |Change                                 |
|12th November 2019                   |Initial Publication                    |

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