Privilege escalation in Zyxel GS1900 series switches

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU76987

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-2022-45853

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to application does not properly impose security restrictions, which leads to security restrictions bypass and privilege escalation.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

GS1900-8: 2.70(AAHH.3)

GS1900-8HP: 2.70(AAHI.3)

GS1900-10HP: 2.70(AAZI.3)

GS1900-16: 2.70(AAHJ.3)

GS1900-24: 2.70(AAHL.3

GS1900-24E: 2.70(AAHK.3)

GS1900-24EP: 2.70(ABTO.3)

GS1900-24HPv2: 2.70(ABTP.3)

GS1900-48: 2.70(AAHN.3)

GS1900-48HPv2: 2.70(ABTQ.3)

External links

http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-privilege-escalation-vulnerability-in-gs1900-series-switches

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.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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