Monday, December 4, 2023

CISA Releases Test Tool for Citrix ADC and Gateway Vulnerability – Sysadmins Can Test Now

CISA has released a new tool for administrators and users to check for Citrix Application Delivery Controller (ADC) and Citrix Gateway vulnerability.

The vulnerability can be tracked as CVE-2019-19781, it allows an unauthenticated remote attacker to execute arbitrary code on the vulnerable system.

Tool for Testing

CISA has published a tool that allows users and administrators to check their Citrix Application Delivery Controller (ADC) and Citrix Gateway vulnerable to CVE-2019-19781.

The tool can be downloaded from GitHub, to execute it requires Python versions 3.6 and above.

To scan a host:

cve-2019-19781 citrix.example.org

If the system is vulnerable it shows the message as “2020-01-10 22:11:46,312 WARNING citrix.example.org appears to be vulnerable.”

Active Scans & PoC Published

The vulnerability was discovered in December, A couple of days before researchers spotted active scans targeting the vulnerability.

Citrix earlier released a security advisory detailing steps to mitigate the execution vulnerability.

Last weekend a group of security researchers published working exploit code for the vulnerability online. More details can be found here.

After the public release, there is a huge spike detected on honeypots, attackers started using public exploits to install backdoors.

https://twitter.com/MalwareTechBlog/status/1217027608417669120
https://twitter.com/bad_packets/status/1216941115342905344

Patch to be Published

Citrix says that patch to be published with the end of January 2020, in the meantime users are strongly recommended to deploy a responder policy to mitigate the issue in the interim until a permanent fix is available.

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