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Finding Juniper SRX and EX devices with runZero

, by Rob King

Today, January 12th, 2024, Juniper Networks disclosed a serious vulnerability in Juniper SRX firewalls and EX switches.

The issue, identified as CVE-2024-21591, allows remote attackers to create a denial-of-service (DoS) condition or to execute arbitrary code with root privileges on vulnerable devices.

This vulnerability has a CVSS score of 9.8 out of 10, indicating that this is a critical vulnerability. According to their disclosure, Juniper Networks is not aware of any active exploitation of this vulnerability.

What is the impact? #

Upon successful exploitation of these vulnerabilities, attackers can execute arbitrary code on the vulnerable system with root privileges. In general, this means that a successful attack would result in complete system compromise.

Are updates or workarounds available? #

Juniper has released a software update to address this vulnerability. This update available through their support portal and other update distribution mechanisms.

How do I find potentially vulnerable Juniper devices with runZero? #

From the Asset Inventory, use the following query to locate assets that may be running the vulnerable operating system in your network:

hw:"Juniper EX" OR hw:"Juniper SRX"

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Rob King
Written by Rob King

Rob King is a Principal Researcher at runZero. Over his career Rob has served as a senior researcher with KoreLogic, the architect for TippingPoint DVLabs, and helped get several startups off the ground. Rob helped design SC Magazine's Data Leakage Prevention Product of the Year for 2010, and was awarded the 3Com Innovator of the Year Award in 2009. He has been invited to speak at BlackHat, Shmoocon, SANS Network Security, and USENIX.

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