Insecure permissions in Junos OS on cSRX Series devices

1) Incorrect default permissions

EUVDB-ID: #VU68368

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-2022-22251

CWE-ID: CWE-276 - Incorrect Default Permissions

Exploit availability: No

Description

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

The vulnerability exists due to incorrect default permissions in the container filesystem combined with storing passwords in a recoverable format on cSRX Series devices. A local user with access to the system can retrieve credentials and compromise the affected device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 20.2R1 - 21.1R3-S5

CPE2.3

• cpe:2.3:o:juniper_networks:juniper_junos_os:21.1R3-S5:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:20.4R3-S8:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:20.2R3-S8:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:20.3R3-S6:*:*:*:*:*:*:*

External links

http://supportportal.juniper.net/s/article/2022-10-Security-Bulletin-cSRX-Series-Storing-Passwords-in-a-Recoverable-Format-and-software-permissions-issues-allows-a-local-attacker-to-elevate-privileges-CVE-2022-22251

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.