SB2023071427 - Denial of service in Junos OS SRX 4600 and SRX 5000 series routers

Description

This security bulletin contains information about 1 security vulnerability.

1) Incomplete Internal State Distinction (CVE-ID: CVE-2023-36834)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to an error in the packet forwarding engine (PFE) of Juniper Networks Junos OS on SRX 4600 and SRX 5000 Series. If an SRX is configured in L2 transparent mode the receipt of a specific genuine packet can cause a single Packet Processing Engines (PPE) component of the PFE to run into a loop, which in turn will render the PPE unavailable. Each packet will cause one PPE to get into a loop, leading to a gradual performance degradation until all PPEs are unavailable and all traffic processing stops.

Remediation

Install update from vendor's website.

References

• https://supportportal.juniper.net/s/article/2023-07-Security-Bulletin-Junos-OS-SRX-4600-and-SRX-5000-Series-The-receipt-of-specific-genuine-packets-by-SRXes-configured-for-L2-transparency-will-cause-a-DoS-CVE-2023-36834