(Re)check your patched NetScaler ADC and Gateway appliances for signs of compromise

Administrators of Citrix NetScaler ADC and Gateway appliances should check for evidence of installed webshells even if they implemented fixes for CVE-2023-3519 quickly: A recent internet scan by Fox-IT researchers has revealed over 1,800 backdoored NetScaler devices, 69% of which have been patched for the flaw. “This indicates that while most administrators were aware of the vulnerability and have since patched their NetScalers to a non-vulnerable version, they have not been (properly) checked for signs … More →

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