Vulnerability identifier: #VU79688

Vulnerability risk: High

CVSSv3.1: 9.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2023-36845

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 21.4R1 - 21.4R3-S3, 22.4R1 - 22.4R2, 22.3R1 - 22.3R2-S1, 22.2R1 - 22.2R3, 21.3R1 - 21.3R3-S4, 21.2R1 - 21.2R3-S5, 20.4 - 20.4R3-S7, 22.1R1 - 22.1R3-S2

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External links
http://supportportal.juniper.net/JSA72300
http://packetstormsecurity.com/files/download/174865/junos_phprc_auto_prepend_file.rb.txt

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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.