Approximately 2000 Citrix NetScalers backdoored in mass-exploitation campaign

Fox-IT (part of NCC Group) has uncovered a large-scale exploitation campaign of Citrix NetScalers in a joint effort with the Dutch Institute of Vulnerability Disclosure (DIVD). An adversary appears to have exploited CVE-2023-3519 in an automated fashion, placing webshells on vulnerable NetScalers to gain persistent access. The adversary can execute arbitrary commands with this webshell, … Continue reading Approximately 2000 Citrix NetScalers backdoored in mass-exploitation campaign →

CVE-2022-27510, CVE-2022-27518 – Measuring Citrix ADC & Gateway version adoption on the Internet

Authored by Yun Zheng Hu Recently, two critical vulnerabilities were reported in Citrix ADC and Citrix Gateway; where one of them was being exploited in the wild by a threat actor. Due to these vulnerabilities being exploitable remotely and given the situation of past Citrix vulnerabilities, RIFT started to research on how to identify the … Continue reading CVE-2022-27510, CVE-2022-27518 – Measuring Citrix ADC & Gateway version adoption on the Internet →

One Year Since Log4Shell: Lessons Learned for the next ‘code red’

Authored by Edwin van Vliet and Max Groot One year ago, Fox-IT and NCC Group released their blogpost detailing findings on detecting & responding to exploitation of CVE-2021-44228, better known as ‘Log4Shell’. Log4Shell was a textbook example of a code red scenario: exploitation was trivial, the software was widely used in all sorts of applications … Continue reading One Year Since Log4Shell: Lessons Learned for the next ‘code red’ →