Privilege escalation in Juniper Junos OS

1) OS Command Injection

EUVDB-ID: #VU49546

Risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-0219

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 install package validation subsystem. A local user can abuse the request system software add validate-on-host CLI command and execute arbitrary OS commands with root privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 17.3 - 20.4

External links

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11109&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.