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  • Insights

Citrix ADC, Gateway, and SD-WAN WANOP Security Update

Jeff Silverman

2 min read

All Insights

Issue

Multiple vulnerabilities have been discovered in Citrix ADC (formerly known as NetScaler ADC) and Citrix Gateway (formerly known as NetScaler Gateway), and Citrix SD-WAN WANOP Edition models 4000-WO, 4100-WO, 5000-WO, and 5100-WO. These vulnerabilities, if exploited, could result in the following security issues:

  • CVE-2021-22919
    • Description – Limited disk space consumption on the appliance
    • CWE – CWE-400: Uncontrolled Resource Consumption
    • Affected Products – Citrix ADC, Citrix Gateway, Citrix SD-WAN WANOP Edition
    • Pre-conditions – Unauthenticated attacker must be able to reach the management GUI
  • CVE-2021-22920
    • Description – SAML authentication hijack through a phishing attack to steal a valid user session
    • CWE – CWE-284: Improper access control
    • Affected Products – Citrix ADC, Citrix Gateway
    • Pre-conditions – Citrix ADC or Citrix Gateway must be configured as a SAML SP
  • CVE-2021-22927
    • Description – Session fixation by an authorized user on SAML SP
    • CWE – CWE-384: Session Fixation
    • Affected Products – Citrix ADC, Citrix Gateway
    • Pre-conditions – Citrix ADC or Citrix Gateway must be configured as a SAML SP

 

Affected versions

  • The following supported versions of Citrix ADC, Citrix Gateway, and Citrix SD-WAN WANOP Edition are affected by CVE-2021-22919:
    • Citrix ADC and Citrix Gateway 13.0 before 13.0-82.45
    • Citrix ADC and Citrix Gateway 12.1 before 12.1-62.27
    • Citrix ADC and NetScaler Gateway 11.1 before 11.1-65.22
    • Citrix ADC 12.1-FIPS before 12.1-55.247
    • Citrix SD-WAN WANOP Edition 11.4 before 11.4.0.a
    • Citrix SD-WAN WANOP Edition 11.3 before 11.3.2.a
    • Citrix SD-WAN WANOP Edition 11.2 before 11.2.3.b
    • Citrix SD-WAN WANOP Edition 10.2 before 10.2.9.b
  • The following supported versions of Citrix ADC and Citrix Gateway are affected by CVE-2021-22920:
    • Citrix ADC and Citrix Gateway 13.0-82.42
    • Citrix ADC and Citrix Gateway 12.1-62.25
  • The following supported versions of Citrix ADC and Citrix Gateway are affected by CVE-2021-22927:
    • Citrix ADC and Citrix Gateway 13.0 before 13.0-82.45
    • Citrix ADC and Citrix Gateway 12.1 before 12.1-62.27
    • Citrix ADC and NetScaler Gateway 11.1 before 11.1-65.22
    • Citrix ADC 12.1-FIPS before 12.1-55.247

 

Recommended Action

Citrix strongly recommends that affected customers install relevant updates as soon as possible.

  • The following supported versions of Citrix ADC, Citrix Gateway and Citrix SD-WAN WANOP Edition address CVE-2021-22919:
    • Citrix ADC and Citrix Gateway 13.0-82.45 and later releases of 13.0
    • Citrix ADC and Citrix Gateway 12.1-62.27 and later releases of 12.1
    • Citrix ADC and NetScaler Gateway 11.1-65.22 and later releases of 11.1
    • Citrix ADC 12.1-FIPS 12.1-55.247 and later releases of 12.1-FIPS
    • Citrix SD-WAN WANOP Edition 11.4.0a and later releases of 11.4
    • Citrix SD-WAN WANOP Edition 11.3.2a and later releases of 11.3
    • Citrix SD-WAN WANOP Edition 11.2.3b and later releases of 11.2
    • Citrix SD-WAN WANOP Edition 10.2.9b and later releases of 10.2
  • The following supported versions of Citrix ADC and Citrix Gateway address CVE-2021-22920
    • Citrix ADC and Citrix Gateway 13.0-82.45 and later releases of 13.0
    • Citrix ADC and Citrix Gateway 12.1-62.27 and later releases of 12.1
  • The following supported versions of Citrix ADC and Citrix Gateway address CVE-2021-22927
    • Citrix ADC and Citrix Gateway 13.0-82.45 and later releases of 13.0
    • Citrix ADC and Citrix Gateway 12.1-62.27 and later releases of 12.1
    • Citrix ADC and NetScaler Gateway 11.1-65.22 and later releases of 11.1
    • Citrix ADC 12.1-FIPS 12.1-55.247 and later releases of 12.1-FIPS

If Citrix ADC or Citrix Gateway is configured as a SAML SP, customers must ensure that the device is configured accordingly. See https://support.citrix.com/article/CTX316577 for details. Customers who have previously set the SAML configuration according to the document do not need to reapply the configuration changes.

More Information

You can read more about the issue here or reach out to our team if you would like professional assistance.