Juniper Junos OS on SRX Packet Forwarding Engine state distinction

Summaryinfo

A vulnerability described as critical has been identified in Juniper Junos OS on SRX. Affected by this vulnerability is an unknown functionality of the component Packet Forwarding Engine. Executing a manipulation can lead to state distinction. This vulnerability is registered as CVE-2023-36834. The attack requires access to the local network. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in Juniper Junos OS on SRX (Router Operating System) (unknown version). This vulnerability affects an unknown code block of the component Packet Forwarding Engine. The manipulation with an unknown input leads to a state distinction vulnerability. The CWE definition for the vulnerability is CWE-372. The product does not properly determine which state it is in, causing it to assume it is in state X when in fact it is in state Y, causing it to perform incorrect operations in a security-relevant manner. As an impact it is known to affect availability. CVE summarizes:

An Incomplete Internal State Distinction vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on SRX 4600 and SRX 5000 Series allows an adjacent attacker to cause a Denial of Service (DoS). 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. To recover the affected FPC need to be restarted. This issue affects Juniper Networks Junos OS on SRX 4600 and SRX 5000 Series: 20.1 version 20.1R1 and later versions; 20.2 versions prior to 20.2R3-S7; 20.3 version 20.3R1 and later versions; 20.4 versions prior to 20.4R3-S7; 21.1 versions prior to 21.1R3-S5; 21.2 versions prior to 21.2R3-S3; 21.3 versions prior to 21.3R3-S3; 21.4 versions prior to 21.4R3-S1; 22.1 versions prior to 22.1R3; 22.2 versions prior to 22.2R2; 22.3 versions prior to 22.3R1-S1, 22.3R2.

The weakness was published 07/14/2023 as JSA71641. The advisory is available at supportportal.juniper.net. This vulnerability was named CVE-2023-36834 since 06/27/2023. The technical details are unknown and an exploit is not available.

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• Juniper

Name

• Junos OS

License

• commercial

Website

• Vendor: https://www.juniper.net/

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