Executive Summary

This vulnerability is a NULL Pointer Dereference in the chassis daemon (chassisd) of Juniper Networks Junos OS on MX, SRX, and EX Series devices. A local attacker with low privileges can trigger this by executing the 'show chassis' command with specially crafted options, causing the chassisd process to crash and restart. This leads to reinitialization of all chassis components except the Routing Engine, resulting in a complete service outage until the system recovers.

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Impact Analysis

The vulnerability can cause a Denial-of-Service (DoS) condition on affected Junos OS devices. When exploited, it causes the chassis daemon to crash and restart, leading to a temporary outage of all chassis components except the Routing Engine. This results in a complete service outage during the reinitialization period, impacting network availability.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade Junos OS on MX, SRX, and EX Series devices to versions that have fixed the issue. Specifically, update to versions 22.4R3-S8 or later, 23.2R2-S5 or later, 23.4R2-S6 or later, 24.2R2-S2 or later, or 24.4R2 or later, depending on your current version. Avoid allowing low-privilege users to execute the 'show chassis' command with crafted options until the update is applied.

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