Privilege escalation in Juniper Junos OS

1) OS Command Injection

EUVDB-ID: #VU49547

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-2021-0218

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 escalate privileges on the system.

The vulnerability exists due to improper input validation in the license-check daemon. A local user can execute the request system license update CLI command and execute arbitrary OS commands with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 17.3 - 20.3

External links

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11108&cat=SIRT_1&actp=LIST

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.