Zyxel Releases Patches for Firmware Vulnerabilities

Zyxel has released patches addressing command injection and remote code execution vulnerabilities in two NAS products that have reached end-of-vulnerability-support. Users are advised to install them for optimal protection.

Three out of five vulnerabilities could allow an unauthorized attacker to run operating system commands and arbitrary code on affected installations.

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ALERT (CVE: 2023-28771)
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CVE-2024-29972

This command injection vulnerability in the CGI program “remote_help-cgi” in Zyxel NAS326 and NAS542 devices could allow an unauthenticated attacker to execute some operating system (OS) commands by sending a crafted HTTP POST request.

CVE-2024-29973

This command injection vulnerability in the “setCookie” parameter in Zyxel NAS326 and NAS542 devices could allow an unauthenticated attacker to execute some OS commands by sending a crafted HTTP POST request.

CVE-2024-29974

This remote code execution vulnerability in the CGI program “file_upload-cgi” in Zyxel NAS326 and NAS542 devices could allow an unauthenticated attacker to execute arbitrary code by uploading a crafted configuration file to a vulnerable device.

CVE-2024-29975

This improper privilege management vulnerability in the SUID executable binary in Zyxel NAS326 and NAS542 devices could allow an authenticated local attacker with administrator privileges to execute some system commands as the “root” user on a vulnerable device.

CVE-2024-29976

This improper privilege management vulnerability in the command “show_allsessions” in Zyxel NAS326 and NAS542 devices could allow an authenticated attacker to obtain a logged-in administrator’s session information containing cookies on an affected device.

Outpost24 security researcher Timothy Hjort credited and reported five flaws.