ESB-2018.0612 - [Appliance] Citrix NetScaler products: Multiple vulnerabilities 2018-03-02

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0612
       Security vulnerabilities patched in Citrix NetScaler products
                               2 March 2018

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

Product:           Citrix NetScaler ADC
                   Citrix NetScaler Gateway
Publisher:         Citrix
Operating System:  Network Appliance
Impact/Access:     Root Compromise          -- Existing Account            
                   Cross-site Scripting     -- Remote with User Interaction
                   Access Confidential Data -- Remote/Unauthenticated      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-6811 CVE-2018-6810 CVE-2018-6809
                   CVE-2018-6808 CVE-2018-6186 

Original Bulletin: 
   https://support.citrix.com/article/CTX232161

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CTX232161

Citrix NetScaler Application Delivery Controller and NetScaler Gateway Multiple
Security Updates

Applicable Products

  * NetScaler 12.0
  * NetScaler 11.1
  * NetScaler 11.0
  * NetScaler 10.5
  * NetScaler Gateway 12.0
  * NetScaler Gateway 11.1
  * NetScaler Gateway 11.0
  * NetScaler Gateway 10.5

Description of Problem

A number of vulnerabilities have been identified in supported versions of
Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway.

The following vulnerabilities have been addressed:

  * CVE-2018-6810: Citrix NetScaler Application Delivery Controller (ADC) and
    NetScaler Gateway Directory Traversal Vulnerability
  * CVE-2018-6808: Citrix NetScaler Application Delivery Controller (ADC) and
    NetScaler Gateway Arbitrary File Download Vulnerability
  * CVE-2018-6809: Citrix NetScaler Application Delivery Controller (ADC) and
    NetScaler Gateway Privilege Escalation Vulnerability
  * CVE-2018-6811: Multiple Cross-Site Scripting vulnerabilities in Citrix
    NetScaler Application Delivery Controller (ADC) and NetScaler Gateway
  * CVE-2018-6186: Citrix NetScaler VPX through NS12.0 53.13.nc allows an SSRF
    attack via the /rapi/read_url URI by an authenticated attacker who has a
    webapp account. The attacker can gain access to the nsroot account, and
    execute remote commands with root privileges.

The vulnerabilities affect the following versions of Citrix NetScaler ADC and
NetScaler Gateway:

  * Citrix NetScaler ADC and NetScaler Gateway earlier than version 12.0 Build
    57.19
  * Citrix NetScaler ADC and NetScaler Gateway earlier than version 11.1 Build
    56.15
  * Citrix NetScaler ADC and NetScaler Gateway earlier than version 11.0 Build
    71.18
  * Citrix NetScaler ADC and NetScaler Gateway earlier than version 10.5 Build
    67.10

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What Customers Should Do

These vulnerabilities have been addressed in the following versions of Citrix
NetScaler ADC and NetScaler Gateway:

  * Citrix NetScaler ADC and NetScaler Gateway version 12.0 Build 57.19 and
    later
  * Citrix NetScaler ADC and NetScaler Gateway version 11.1 Build 56.15 and
    later
  * Citrix NetScaler ADC and NetScaler Gateway version 11.0 Build 71.18 and
    later
  * Citrix NetScaler ADC and NetScaler Gateway version 10.5 Build 67.10 and
    later

Citrix recommends that affected customers upgrade their NetScaler appliances to
a version of the appliance firmware that contains a fix for these issues as
soon as their patching schedule allows.

These versions are available on the Citrix website at the following addresses:

https://www.citrix.com/downloads/netscaler-adc/

https://www.citrix.com/downloads/netscaler-gateway/

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Acknowledgements

Citrix thanks the Qualys Security Research Team (https://www.qualys.com) for
working with us to protect Citrix customers.

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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/.

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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. 

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Reporting Security Vulnerabilities

Citrix welcomes input regarding the security of its products and considers any
and all potential vulnerabilities seriously. For guidance on how to report
security-related issues to Citrix, please see the following document: CTX081743
? Reporting Security Issues to Citrix

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Changelog

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|Date                              |Change                                    |
|----------------------------------+------------------------------------------|
|1st March 2018                    |Initial publishing                        |
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