#VU79687 Input validation error in Juniper Junos OS - CVE-2023-36844

Vulnerability identifier: #VU79687

Vulnerability risk: High

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2023-36844

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: Yes

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

Vendor: Juniper Networks, Inc.

Description

The vulnerability allows a remote attacker to modify application behavior.

The vulnerability exists due to insufficient validation of user-supplied input in J-Web. A remote attacker can modify values of certain PHP environments variables and modify application's behavior.

Successful exploitation of the vulnerability can lead to remote code execution.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 20.4R1-S1 - 20.4, 21.2R1-S1 - 21.2R3, 21.3R1-S1 - 21.3R3, 21.4R1-S1 - 21.4R3, 22.1R1-S1 - 22.1R3, 22.2R1-S1 - 22.2R3, 22.3R1-S1 - 22.3R2, 22.4R1-S1 - 22.4R2

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External links
https://supportportal.juniper.net/JSA72300

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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?

Yes. This vulnerability is being exploited in the wild.