Overview :
Citrix SD-WAN 10.2.x before 10.2.6 and 11.0.x before 11.0.3 has Missing SSL Certificate Validation.An information disclosure vulnerability has been identified in the Citrix SD-WAN Appliance. This vulnerability could allow an unauthenticated attacker to perform a man-in-the-middle attack against management traffic. The vulnerability has been assigned the following CVE number.

CVE-2020-6175 – Information Disclosure in Citrix SD-WAN Appliance 10.2.x before 10.2.6 and 11.0.x before 11.0.3

Affected Product(s) :

Affected Versions:

  • All versions of NetScaler SD-WAN 10.0.x and earlier *
  • All versions of Citrix SD-WAN 10.1.x *
  • All versions of Citrix SD-WAN 10.2.x earlier than 10.2.6
  • All versions of Citrix SD-WAN 11.0.x earlier than 11.0.3

*  Upgrade to 10.2.6, 11.0.3, or newer for security update


Mitigating Factors

In order to protect against these vulnerabilities and web application related issues, Citrix recommends access to the management interface be restricted. In situations where customers have deployed their appliances in line with industry best practice, network access to this interface should already be restricted and default system certificates should be replaced by certificates from a reputable Certificate Authority.

Security Best Practices:

10.2.x – https://docs.citrix.com/en-us/citrix-sd-wan/10-2/best-practices/security-best-practices.html

11.x – https://docs.citrix.com/en-us/citrix-sd-wan/11/best-practices/security-best-practices.html


What Customers Should Do

This vulnerability has been addressed in the following software versions:

  • Citrix SD-WAN 10.2.6
  • Citrix SD-WAN 11.0.3

Citrix strongly recommends that customers using vulnerable combinations of hardware and software upgrade their appliances to a fixed version or later as soon as possible.

Citrix also recommends that customers either: replace default system certificates by uploading and installing certificates from a reputable Certificate Authority, or regenerate their self-signed certificate. The functionality for both actions can be accessed at: Configuration> Appliance Settings> Administrator Interface> HTTPS Certs in the SD-WAN appliance GUI as described in the Best Practices Guide under section “Secure administrator interface”.

The new software versions will be available on the Citrix website. Information on the available versions can be found at the following location:

https://www.citrix.com/downloads/netscaler-sd-wan/

In line with general best practice, Citrix also recommends that customers limit access to the management console of the Citrix SD-WAN Appliance to trusted network traffic only.


What Citrix Is Doing

Citrix is notifying customers and channel partners about this potential security issue. This article is also available from the Citrix Knowledge Center at  http://support.citrix.com/.


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  https://www.citrix.com/support/open-a-support-case.html.

Vulnerability Details :
CVE ID :

CVE-2020-6175

Description of Problem

An information disclosure vulnerability has been identified in the Citrix SD-WAN Appliance. This vulnerability could allow an unauthenticated attacker to perform a man-in-the-middle attack against management traffic. The vulnerability has been assigned the following CVE number.

CVE-2020-6175 – Information Disclosure in Citrix SD-WAN Appliance 10.2.x before 10.2.6 and 11.0.x before 11.0.3

Affected Versions:

  • All versions of NetScaler SD-WAN 10.0.x and earlier *
  • All versions of Citrix SD-WAN 10.1.x *
  • All versions of Citrix SD-WAN 10.2.x earlier than 10.2.6
  • All versions of Citrix SD-WAN 11.0.x earlier than 11.0.3

*  Upgrade to 10.2.6, 11.0.3, or newer for security update