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January 8, 2020

Rewterz Threat Advisory – Active Scanning of Vulnerable Citrix Servers

January 8, 2020

Severity

High

Analysis Summary

Ongoing scans for Citrix Application Delivery Controller (NetScaler ADC) and Citrix Gateway (NetScaler Gateway) servers vulnerable to attacks exploiting CVE-2019-19781

If exploited, it could allow an unauthenticated remote attacker to access private network resources and execute arbitrary code on vulnerable systems. This attack does not require access to any accounts, and therefore can be performed by any external attacker.

This vulnerability allows any unauthorized attacker to not only access published applications, but also attack other resources on the company’s internal network from the Citrix server.

Impact

Arbitrary code execution

Affected Vendors

Citrix

Affected Products

  • Citrix ADC and Citrix Gateway version 13.0 all supported builds
  • Citrix ADC and NetScaler Gateway version 12.1 all supported builds
  • Citrix ADC and NetScaler Gateway version 12.0 all supported builds
  • Citrix ADC and NetScaler Gateway version 11.1 all supported builds
  • Citrix NetScaler ADC and NetScaler Gateway version 10.5 all supported builds

Remediation

Citrix has released a set of mitigation measures which can be implemented and recommends recommends all impacted customers to apply them as soon as possible.

  • Services
    • Asses
      • Compromise Assessment
      • APT Assessment
      • Penetration Testing
      • Secure Architecture Design & Review
      • Red Team Assessment
      • Purple Team Assessment
      • Social Engineering
      • Source Code Review
    • Respond
      • Incident Response
      • Incident Analysis
  • Transform
    • SOC Consultancy
    •     SOC Maturity Assessment
    •     SOC Model Evaluation
    •     SOC Gap Analysis
    •     SIEM Gap Analysis
    •     SIEM Optimization
    •     SOC Content Pack
  • Train
    • Security Awareness and Training
    • Tabletop Exercise
    • Simulated Cyber Attack Exercises
  • Managed Security
    • Managed Security Monitoring
      • Remote SOC
      • Onsite SOC
      • Hybrid SOC
    • Managed Security Services
      • Managed Detection and Response
      • Managed Endpoint Detection and Response
      • Managed Threat Intelligence
      • Managed Threat Hunting
      • Managed Risk-Based SOAR
      • Managed Penetration Testing
  • Solutions
  • Resources
    • Blog
    • Threat Advisory
  • Company
    • About Us
    • Careers
    • Contact
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