Vulnerability identifier: #VU82386

Vulnerability 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

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Juniper Junos OS
Operating systems & Components / Operating system

Vendor: Juniper Networks, Inc.

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: 21.4R1 - 21.4R3-S4, 23.1R1 - 23.1R1-S1, 22.4R1 - 22.4R2, 22.3R1 - 22.3R2-S1, 22.2R1 - 22.2R3-S1, 22.1R1 - 22.1R3-S3, 21.3R1 - 21.3R3-S4, 21.2R1 - 21.2R3-S5, 20.4 - 20.4R3-S7

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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

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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.