Mar 12, 2019 If you thought Citrix NetScaler was one product, you’re mistaken. It is the defunct name for a line of networking solutions from Citrix. The NetScaler brand was abandoned in 2018, just a few days after Citrix’s annual Synergy conference. Oct 07, 2020 Citrix ADC is an application delivery controller that analyses application-specific traffic to distribute, optimize, and secure Layer 4-Layer 7 (L4–L7) network traffic intelligently for web applications. Feb 12, 2017 At its most basic, a Citrix NetScaler is an Application Delivery Controller. If you are like most, that bit of information is not helpful in understanding what a NetScaler actually does. Even among those that know and work with Citrix NetScaler, the most common way it is described is as a Swiss Army knife.
Bramble hollow equestrian centreriver oak saddlery. Citrix NetScaler is a Web application delivery appliance that reduces TCO of Web application delivery, optimizes the user experience and makes applications run five times better.
This all-in-one web application delivery controller (ADC) makes applications run up to five times faster, cuts web application ownership costs with server offloading, and makes sure that applications are always available with its application load balancing capabilities. With NetScaler you can also share capacity across instances on premises and in the cloud.
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Threat Information
Citrix is aware of a DDoS attack pattern impacting Citrix ADC and Citrix Gateway. As part of this attack, an attacker or bots can overwhelm the Citrix ADC DTLS network throughput, potentially leading to outbound bandwidth exhaustion. The effect of this attack appears to be more prominent on connections with limited bandwidth.
There are no known Citrix vulnerabilities associated with this event.
Citrix recommends administrators be cognizant of attack indicators, monitor their systems and keep their appliances up to date.
Attack Indicators
To determine if a Citrix ADC or Citrix Gateway is being targeted by this attack, monitor the outbound traffic volume for any significant anomaly or spikes.
Enhancements
Citrix has added a feature enhancement for DTLS which, when enabled, addresses the susceptibility to this attack pattern. The enhancement builds are available on the Citrix downloads page for the following versions:
- Citrix ADC and Citrix Gateway 13.0-71.44 and later releases
- NetScaler ADC and NetScaler Gateway 12.1-60.19 and later releases
- Citrix ADC 12.1-FIPS 12.1-55.210 and later releases
- NetScaler ADC and NetScaler Gateway 11.1-65.16 and later releases
Customers who do not use DTLS do not need to upgrade to the enhancement build. Instead, customers are recommended to disable DTLS by using the following ADC CLI command:
Customers using DTLS are recommended to upgrade to the enhancement build and enable “HelloVerifyRequest” in each DTLS profile by using the following ADC CLI instructions:
- List all DTLS profiles by running the command:
For each DTLS profile, enable the “HelloVerifyRequest” setting by running the command:
- Save the updated configuration by running the command:
- To verify “Hello Verify Request” is enabled, run the command:
Citrix Netscaler Download
If DTLS was disabled based on a previous version of this advisory, re-enable the DTLS profile by running the following command:
Obtaining Support on This Issue
If you require technical assistance with this issue, please contact Citrix Technical Support. Contact details for Citrix Technical Support are available at http://www.citrix.com/site/ss/supportContacts.asp.
Disclaimer
This document is provided on an 'as is' basis and does not imply any kind of guarantee or warranty, including the warranties of merchantability or fitness for a particular use. Your use of the information on the document is at your own risk. Citrix reserves the right to change or update this document at any time.
Changelog
All About Citrix Netscaler
| Date | Change |
| 2020-12-23 | Initial Publication |
| 2021-01-04 | Enhancements Released |
| 2021-01-11 | Enhancements Released in 12.1-FIPS |