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



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-36834
CWE-ID CWE-372
Exploitation vector Local network
Public exploit N/A
Vulnerable software
 Juniper Junos OS
Operating systems & Components / Operating system

Vendor Juniper Networks, Inc.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Incomplete Internal State Distinction

EUVDB-ID: #VU78261

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-36834

CWE-ID: CWE-372 - Incomplete Internal State Distinction

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 20.2R1-S1 - 22.3R1

CPE2.3 External links

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


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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