SB2023042508 - Multiple vulnerabilitiesin Zyxel firewalls and APs

Description

This security bulletin contains information about 6 secuirty vulnerabilities.

1) Command Injection (CVE-ID: CVE-2023-22913)

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.

2) Path traversal (CVE-ID: CVE-2023-22914)

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.

3) Buffer overflow (CVE-ID: CVE-2023-22915)

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.

4) Input validation error (CVE-ID: CVE-2023-22916)

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.

5) Buffer overflow (CVE-ID: CVE-2023-22917)

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.

6) Information disclosure (CVE-ID: CVE-2023-22918)

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.

Remediation

Install update from vendor's website.

References

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