CISA Releases Update to Threat Actors Exploiting Citrix CVE-2023-3519 to Implant Webshells

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Summary:

The Cybersecurity and Infrastructure Security Agency (CISA) has released an updated Cybersecurity Advisory (CSA) regarding the exploitation of Citrix CVE-2023-3519 by threat actors to implant webshells. The original CSA was published to alert network defenders of critical infrastructure organizations about the vulnerability and to provide information on the threat actor’s tactics, techniques, and procedures (TTPs) and indicators of compromise (IOCs).

The updated CSA includes new TTPs and IOCs received from industry and international partners, as well as an additional victim. The Joint Cyber Defense Collaborative (JCDC), a collaborative effort between CISA and other organizations, has been facilitating real-time threat information sharing since July 2023. JCDC has provided detection methods, TTPs, and IOCs to partners, which have been consolidated and shared with CISA.

CISA urges critical infrastructure organizations to review the updated CSA and follow the recommended mitigation strategies, including prioritizing patching known exploited vulnerabilities like Citrix CVE-2023-3519. The advisory outlines the critical importance of addressing this vulnerability to prevent potential security breaches.

Furthermore, CISA encourages reported incidents and anomalous activity through its Incident Reporting System or the 24/7 Operations Center, which can be reached at report@cisa.gov or (888) 282-0870.

Overall, this updated CSA serves as a critical reminder of the ongoing threat posed by the exploitation of CVE-2023-3519 and the importance of robust cybersecurity measures to prevent and respond to potential security incidents.