Vulnerability identifier: #VU57418

Vulnerability 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-2021-31359

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

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

Vendor: Juniper Networks, Inc.

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions in the Juniper DHCP daemon (jdhcpd) process, which leads to security restrictions bypass and privilege escalation.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 15.1R - 15.1R7-S9, 17.4R1 - 17.4R3-S4, 17.4R2-S9, 18.3R1 - 18.3R3-S4, 18.3R3-S1, 18.3R2-S3, 18.4R1 - 18.4R3-S8, 18.4R2-S3, 18.4R1-S5, 19.1R - 19.1R3-S5, 19.1R1-S4, 19.2R1 - 19.2R3-S2, 19.2R1-S4, 19.3R1 - 19.3R3-S2, 19.3R2 - 19.3R2-S5, 19.3R1-S1, 19.4R2 - 19.4R3-S5, 19.4R1 - 19.4R1-S4, 20.1R1 - 20.1R3, 20.2R1 - 20.2R3-S1, 20.3R1 - 20.3R2-S1, 20.4R1 - 20.4R2, 21.1R1

Junos OS Evolved: 20.4 - 20.4R2-S1-EVO, 20.4R2-S2-EVO, 21.2-EVO

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External links
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11222&cat=SIRT_1&actp=LIST

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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.