Multiple vulnerabilitiesin Zyxel firewalls and APs

1) Command Injection

EUVDB-ID: #VU75462

Risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-22913

CWE-ID: CWE-77 - Command injection

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary commands on the target system.

The vulnerability exists due to improper input validation in the "account_operator.cgi" CGI program. A remote user can pass specially crafted data to the application and execute arbitrary commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

USG FLEX series: 4.50 - 5.35

VPN series: 4.30 - 5.35

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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

2) Path traversal

EUVDB-ID: #VU75463

Risk: Low

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

CVE-ID: CVE-2023-22914

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows a remote user to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in the "account_print.cgi" CGI program. A remote administrator can send a specially crafted HTTP request and read arbitrary files on the system, leading to arbitrary OS commands execution.

Mitigation

Install update from vendor's website.

Vulnerable software versions

USG FLEX series: 4.50 - 5.35

VPN series: 4.30 - 5.35

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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

3) Buffer overflow

EUVDB-ID: #VU75464

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-2023-22915

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in the "fbwifi_forward.cgi" CGI program. A remote attacker can send a specially crafted HTTP request, trigger memory corruption and cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

USG FLEX series: 4.50 - 5.35

USG FLEX 50W: 4.30 - 5.35

USG20W-VPN: 4.30 - 5.35

VPN series: 4.30 - 5.35

External links

http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-of-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.

Is there known malware, which exploits this vulnerability?

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

4) Input validation error

EUVDB-ID: #VU75465

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-22916

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to insufficient validation of user-supplied input in the configuration parser. A remote attacker can trick an administrator to switch the management mode to the cloud mode and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

ATP series: 5.10 - 5.35

USG FLEX series: 5.00 - 5.35

USG FLEX 50W: 5.10 - 5.35

USG20W-VPN: 5.10 - 5.35

VPN series: 5.00 - 5.35

External links

http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-of-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.

5) Buffer overflow

EUVDB-ID: #VU75466

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-2023-22917

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in the "sdwan_iface_ipc" binary. A remote attacker 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: 5.10 - 5.35

USG FLEX series: 5.00 - 5.35

USG FLEX 50W: 5.10 - 5.35

USG20W-VPN: 5.10 - 5.35

VPN series: 5.00 - 5.35

External links

http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-of-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.

6) Information disclosure

EUVDB-ID: #VU75467

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-22918

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application in the CGI program. A remote user can gain unauthorized access to sensitive information on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

ATP series: 4.32 - 5.35

USG FLEX series: 4.50 - 5.35

USG FLEX 50W: 4.16 - 5.35

USG20W-VPN: 4.16 - 5.35

VPN series: 4.30 - 5.35

NAP203: 6.28(ABFA.0)

NAP303: 6.28(ABEX.0)

NAP353: 6.28(ABEY.0)

NWA1123-AC-PRO: 6.28(ABHD.0)

NWA5123-AC HD: 6.25(ABIM.9)

WAC5302D-Sv2: 6.25(ABVZ.9)

WAC6103D-I: 6.28(AAXH.0)

WAC6303D-S: 6.25(ABGL.9)

WAC6502D-E: 6.28(AASD.0)

WAC6502D-S: 6.28(AASE.0)

WAC6503D-S: 6.28(AASF.0)

WAC6552D-S: 6.28(ABIO.0)

WAC6553D-E: 6.28(AASG.0)

NWA110AX: 6.50(ABTG.2)

NWA1123ACv3: 6.50(ABVT.0)

NWA210AX: 6.50(ABTD.2)

NWA220AX-6E: 6.50(ACCO.2)

NWA50AX: 6.29(ABYW.1)

NWA50AX-PRO: 6.50(ACGE.0)

NWA90AX: 6.29(ACCV.1)

NWA90AX-PRO: 6.50(ACGF.0)

WAC500: 6.50(ABVS.0)

WAC500H: 6.50(ABWA.0)

WAX510D: 6.50(ABTF.2)

WAX610D: 6.50(ABTE.2)

WAX620D-6E: 6.50(ACCN.2)

WAX630S: 6.50(ABZD.2)

WAX640S-6E: 6.50(ACCM.2)

WAX650S: 6.50(ABRM.2)

WAX655E: 6.50(ACDO.2)

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user 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.