Multiple vulnerabilities in Zyxel firewalls and APs

Published: 2023-11-28

Risk	Medium
Patch available	YES
Number of vulnerabilities	9
CVE-ID	CVE-2023-35136 CVE-2023-35139 CVE-2023-37925 CVE-2023-37926 CVE-2023-4397 CVE-2023-4398 CVE-2023-5650 CVE-2023-5797 CVE-2023-5960
CWE-ID	CWE-200 CWE-79 CWE-269 CWE-119 CWE-190
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	ATP series Hardware solutions / Routers for home users USG FLEX series Client/Desktop applications / Antivirus software/Personal firewalls VPN series Client/Desktop applications / Antivirus software/Personal firewalls USG FLEX 50W Hardware solutions / Firmware USG20W-VPN Hardware solutions / Firmware NWA110AX Hardware solutions / Firmware NWA210AX Hardware solutions / Firmware NWA1123ACv3 Hardware solutions / Firmware WAC500 Hardware solutions / Firmware WAC500H Hardware solutions / Firmware WAX510D Hardware solutions / Firmware WAX610D Hardware solutions / Firmware WAX650S Hardware solutions / Firmware NWA50AX Hardware solutions / Routers & switches, VoIP, GSM, etc NWA50AX-PRO Hardware solutions / Routers & switches, VoIP, GSM, etc NWA55AXE Hardware solutions / Routers & switches, VoIP, GSM, etc NWA90AX Hardware solutions / Routers & switches, VoIP, GSM, etc NWA90AX-PRO Hardware solutions / Routers & switches, VoIP, GSM, etc NWA220AX-6E Hardware solutions / Routers & switches, VoIP, GSM, etc WAX300H Hardware solutions / Routers & switches, VoIP, GSM, etc WAX620D-6E Hardware solutions / Routers & switches, VoIP, GSM, etc WAX630S Hardware solutions / Routers & switches, VoIP, GSM, etc WAX640S-6E Hardware solutions / Routers & switches, VoIP, GSM, etc WAX655E Hardware solutions / Routers & switches, VoIP, GSM, etc WBE660S Hardware solutions / Routers & switches, VoIP, GSM, etc
Vendor	ZyXEL Communications Corp.

Security Bulletin

This security bulletin contains information about 9 vulnerabilities.

1) Information disclosure

EUVDB-ID: #VU83516

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-35136

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to improper input validation in the "Quagga" package. A local user can gain unauthorized access to configuration files on the target device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

ATP series: 4.32 - 5.37

USG FLEX series: 4.50 - 5.37

USG FLEX 50W: 4.16 - 5.37

USG20W-VPN: 4.16 - 5.37

VPN series: 4.30 - 5.37

External links

http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps

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.

2) Stored cross-site scripting

EUVDB-ID: #VU83517

Risk: Low

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-35139

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in the CGI program. A remote attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Install update from vendor's website.

Vulnerable software versions

ATP series: 5.10 - 5.37

USG FLEX series: 5.00 - 5.37

USG FLEX 50W: 5.10 - 5.37

USG20W-VPN: 5.10 - 5.37

VPN series: 5.00 - 5.37

External links

http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

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.

Is there known malware, which exploits this vulnerability?

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

3) Improper Privilege Management

EUVDB-ID: #VU83518

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-37925

CWE-ID: CWE-269 - Improper Privilege Management

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to improper privilege management in the debug CLI command. A local user can access system files on the target device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

ATP series: 4.32 - 5.37

USG FLEX series: 4.50 - 5.37

USG FLEX 50W: 4.16 - 5.37

USG20W-VPN: 4.16 - 5.37

VPN series: 4.30 - 5.37

NWA50AX: 6.29(ABYW.2)

NWA50AX-PRO: 6.65(ACGE.1)

NWA55AXE: 6.29(ABZL.2)

NWA90AX: 6.29(ACCV.2)

NWA90AX-PRO: 6.65(ACGF.1)

NWA110AX: 6.65(ABTG.1)

NWA210AX: 6.65(ABTD.1)

NWA220AX-6E: 6.65(ACCO.1)

NWA1123ACv3: 6.65(ABVT.1)

WAC500: 6.65(ABVS.1)

WAC500H: 6.65(ABWA.1)

WAX300H: 6.60(ACHF.1)

WAX510D: 6.65(ABTF.1)

WAX610D: 6.65(ABTE.1)

WAX620D-6E: 6.65(ACCN.1)

WAX630S: 6.65(ABZD.1)

WAX640S-6E: 6.65(ACCM.1)

WAX650S: 6.65(ABRM.1)

WAX655E: 6.65(ACDO.1)

WBE660S: 6.65(ACGG.1)

External links

http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps

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.

4) Buffer overflow

EUVDB-ID: #VU83519

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-37926

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error. A local user can trigger memory corruption and cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

ATP series: 4.32 - 5.37

USG FLEX series: 4.50 - 5.37

USG FLEX 50W: 4.16 - 5.37

USG20W-VPN: 4.16 - 5.37

VPN series: 4.30 - 5.37

External links

http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps

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.

5) Buffer overflow

EUVDB-ID: #VU83520

Risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-4397

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error. A local administrator can trigger memory corruption and cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

ATP series: 5.37

USG FLEX series: 5.37

USG FLEX 50W: 5.37

USG20W-VPN: 5.37

External links

http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps

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.

6) Integer overflow

EUVDB-ID: #VU83521

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-4398

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to integer overflow in the source code of the QuickSec IPSec toolkit used in the VPN feature. A remote attacker can pass specially crafted data to the application, trigger integer overflow and cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

ATP series: 4.32 - 5.37

USG FLEX series: 4.50 - 5.37

USG FLEX 50W: 4.16 - 5.37

USG20W-VPN: 4.16 - 5.37

VPN series: 4.30 - 5.37

External links

http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

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.

Is there known malware, which exploits this vulnerability?

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

7) Improper Privilege Management

EUVDB-ID: #VU83522

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-5650

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 in the ZySH. A local user can modify the URL of the registration page in the web GUI of the target device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

ATP series: 4.32 - 5.37

USG FLEX series: 4.50 - 5.37

USG FLEX 50W: 4.16 - 5.37

USG20W-VPN: 4.16 - 5.37

VPN series: 4.30 - 5.37

External links

http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps

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.

8) Improper Privilege Management

EUVDB-ID: #VU83523

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-5797

CWE-ID: CWE-269 - Improper Privilege Management

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to improper privilege management in the debug CLI command. A local user can access the administrator’s logs on the target device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NWA50AX: 6.29(ABYW.2)

NWA50AX-PRO: 6.65(ACGE.1)

NWA55AXE: 6.29(ABZL.2)

NWA90AX: 6.29(ACCV.2)

NWA90AX-PRO: 6.65(ACGF.1)

NWA110AX: 6.65(ABTG.1)

NWA210AX: 6.65(ABTD.1)

NWA220AX-6E: 6.65(ACCO.1)

NWA1123ACv3: 6.65(ABVT.1)

WAC500: 6.65(ABVS.1)

WAC500H: 6.65(ABWA.1)

WAX300H: 6.60(ACHF.1)

WAX510D: 6.65(ABTF.1)

WAX610D: 6.65(ABTE.1)

WAX620D-6E: 6.65(ACCN.1)

WAX630S: 6.65(ABZD.1)

WAX640S-6E: 6.65(ACCM.1)

WAX650S: 6.65(ABRM.1)

WAX655E: 6.65(ACDO.1)

WBE660S: 6.65(ACGG.1)

ATP series: 4.32 - 5.37

USG FLEX series: 4.50 - 5.37

USG FLEX 50W: 4.16 - 5.37

USG20W-VPN: 4.16 - 5.37

VPN series: 4.30 - 5.37

External links

http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps

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.

9) Improper Privilege Management

EUVDB-ID: #VU83526

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-5960

CWE-ID: CWE-269 - Improper Privilege Management

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to improper privilege management in the hotspot feature. A local user can access the system files on the target device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

USG FLEX series: 4.50 - 5.37

VPN series: 4.30 - 5.37

External links

http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps

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.