Privilege escalation in Junos OS SRX and EX Series

1) OS Command Injection

EUVDB-ID: #VU65371

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-22221

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

The vulnerability allows a local user to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation in the 'request system download ...' and  'show system download ...' commands. A local user can pass specially crafted data to the affected CLI commands and execute arbitrary OS commands on the target system with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 19.1 - 21.4R1

External links

http://supportportal.juniper.net/s/article/2022-07-Security-Bulletin-Junos-OS-SRX-and-EX-Series-Local-privilege-escalation-flaw-in-download-functionality-CVE-2022-22221

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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