Denial of service in Junos OS PFE

Published: 2023-10-25

Risk	Medium
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2023-36843
CWE-ID	N/A
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Juniper Junos OS Operating systems & Components / Operating system
Vendor	Juniper Networks, Inc.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper handling of inconsistent special elements

EUVDB-ID: #VU82386

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-36843

CWE-ID: N/A

Exploit availability: No

Description

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

The vulnerability exists due to improper handling of inconsistent special elements error in the Junos Services Framework (jsf) module when handling malformed SSL traffic. A remote non-authenticated attacker can cause a crash in the Packet Forwarding Engine (pfe).

This issue only affects devices with Juniper Networks Advanced Threat Prevention (ATP) Cloud enabled with Encrypted Traffic Insights (configured via security-metadata-streaming policy).

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 20.4 - 23.1R1-S1

CPE2.3

External links

http://supportportal.juniper.net/s/article/2023-10-Security-Bulletin-Junos-OS-SRX-Series-The-PFE-will-crash-on-receiving-malformed-SSL-traffic-when-ATP-is-enabled-CVE-2023-36843

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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