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Category — NetScaler
Citrix Devices Under Attack: NetScaler Flaw Exploited to Capture User Credentials

Citrix Devices Under Attack: NetScaler Flaw Exploited to Capture User Credentials

Oct 10, 2023 Network Security / Password
A recently disclosed critical flaw in Citrix NetScaler ADC and Gateway devices is being exploited by threat actors to conduct a credential harvesting campaign. IBM X-Force, which uncovered the activity last month,  said  adversaries exploited "CVE-2023-3519 to attack unpatched NetScaler Gateways to insert a malicious script into the HTML content of the authentication web page to capture user credentials." CVE-2023-3519  (CVSS score: 9.8), addressed by Citrix in July 2023, is a critical code injection vulnerability that could lead to unauthenticated remote code execution. Over the past few months, it has been  heavily   exploited  to  infiltrate vulnerable devices  and gain persistent access for follow-on attacks. In the latest attack chain discovered by IBM X-Force, the operators sent a specially crafted web request to trigger the exploitation of CVE-2023-3519 and deploy a PHP-based web shell. The access afforded by the web shell is subsequently leveraged to append cust
Citrix NetScaler Alert: Ransomware Hackers Exploiting Critical Vulnerability

Citrix NetScaler Alert: Ransomware Hackers Exploiting Critical Vulnerability

Aug 29, 2023 Vulnerability / Network Security
Unpatched Citrix NetScaler systems exposed to the internet are being targeted by unknown threat actors in what's suspected to be a ransomware attack. Cybersecurity company Sophos is  tracking  the activity cluster under the moniker  STAC4663 . Attack chains involve the exploitation of  CVE-2023-3519 , a critical code injection vulnerability impacting NetScaler ADC and Gateway servers that could facilitate unauthenticated remote code execution. In one intrusion detected in mid-August 2023, the security flaw is said to have been used to conduct a domain-wide attack, including injecting payloads into legitimate executables such as the Windows Update Agent (wuauclt.exe) and the Windows Management Instrumentation Provider Service (wmiprvse.exe). An analysis of the payload is underway. Other notable aspects include the distribution of obfuscated PowerShell scripts, PHP web shells, and the use of an Estonian service called BlueVPS for malware staging. Sophos said the modus operandi
Sailing the Seven Seas Securely from Port to Port – OT Access Security for Ships and Cranes

Sailing the Seven Seas Securely from Port to Port – OT Access Security for Ships and Cranes

Oct 28, 2024Operational Technology / Cybersecurity
Operational Technology (OT) security has affected marine vessel and port operators, since both ships and industrial cranes are being digitalized and automated at a rapid pace, ushering in new types of security challenges. Ships come to shore every six months on average. Container cranes are mostly automated. Diagnostics, maintenance, upgrade and adjustments to these critical systems are done remotely, often by third-party vendor technicians. This highlights the importance of proper secure remote access management for industrial control systems (ICS).  Learn more in our Buyer's Guide for Secure Remote Access Lifecycle Management .  We at SSH Communications Security (SSH) have been pioneering security solutions that bridge the gap between IT and OT in privileged access management . Let's investigate how we helped two customers solve their critical access control needs with us. Secure Remote Access Around the Globe to 1000s of Ships  In the maritime industry, ensuring secure and e
Nearly 2,000 Citrix NetScaler Instances Hacked via Critical Vulnerability

Nearly 2,000 Citrix NetScaler Instances Hacked via Critical Vulnerability

Aug 16, 2023 Vulnerability / Enterprise Security
Nearly 2,000 Citrix NetScaler instances have been compromised with a backdoor by weaponizing a recently disclosed critical security vulnerability as part of a large-scale attack. "An adversary appears to have exploited CVE-2023-3519 in an automated fashion, placing web shells on vulnerable NetScalers to gain persistent access," NCC Group  said  in an advisory released Tuesday. "The adversary can execute arbitrary commands with this webshell, even when a NetScaler is patched and/or rebooted." CVE-2023-3519 refers to a critical code injection vulnerability impacting NetScaler ADC and Gateway servers that could lead to unauthenticated remote code execution. It was patched by Citrix last month. The development comes a week after the Shadowserver Foundation  said  it identified close to 7,000 vulnerable, unpatched NetScaler ADC and Gateway instances online and the flaw is being abused to drop PHP web shells on vulnerable servers for remote access. A follow-up anal
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How To Comply With The Cyber Insurance MFA Checklist

websiteSilverfortCyber Insurance / Authentication
Learn how to comply with the checklist of resources requiring MFA coverage in cyber insurance policies.
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