Privilege escalation in Zyxel GS1900 series switches



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-35140
CWE-ID CWE-269
Exploitation vector Local
Public exploit N/A
Vulnerable software
 GS1900-8
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-8HP
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-10HP
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-16
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-24
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-24E
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-24EP
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-24HPv2
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-48
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-48HPv2
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor ZyXEL Communications Corp.

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Improper Privilege Management

EUVDB-ID: #VU82796

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-35140

CWE-ID: CWE-269 - Improper Privilege Management

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges.

The vulnerability exists due to improper privilege management. A local user can escalate privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

GS1900-8: 2.70(AAHH.5)

GS1900-8HP: 2.70(AAHI.5)

GS1900-10HP: 2.70(AAZI.5)

GS1900-16: 2.70(AAHJ.5)

GS1900-24: 2.70(AAHL.5)

GS1900-24E: 2.70(AAHK.5)

GS1900-24EP: 2.70(ABTO.5)

GS1900-24HPv2: 2.70(ABTP.5)

GS1900-48: 2.70(AAHN.5)

GS1900-48HPv2: 2.70(ABTQ.5)

CPE2.3 External links

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-improper-privilege-management-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.



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