Monday, February 10, 2025
HomeCVE/vulnerabilityZyxel Firewall Flaw Let Attackers Execute Remote Code

Zyxel Firewall Flaw Let Attackers Execute Remote Code

Published on

SIEM as a Service

Follow Us on Google News

Four new vulnerabilities have been discovered in some of the Zyxel Firewall and access point (AP) versions that are associated with Denial of Service, OS Command Injection, and Remote code execution.

These vulnerabilities have been assigned with CVE-2023-6397, CVE-2023-6398, CVE-2023-6399, and CVE-2023-6764.

The severity of these vulnerabilities ranges between 6.5 (Medium) and 8.1 (High). However, Zyxel networks have fixed these vulnerabilities, and a security advisory has been released to address these vulnerabilities.

Zyxel Firewall Flaw

CVE-2023-6397: Null Pointer Dereference vulnerability in Zyxel

This vulnerability could allow a LAN-based threat actor to cause a denial-of-service condition by downloading a crafted RAR compressed file onto a LAN-side host if the firewall has “Anti-Malware” feature enabled.

The severity for this vulnerability has been given as 6.5 (Medium).

CVE-2023-6398: Post-authentication Command Injection vulnerability

This vulnerability exists in the file upload binary in Zyxel ATP series devices that could allow an authentication threat actor to execute operating system commands on the affected device via FTP with administrative privileges.

The severity for this vulnerability has been given as 7.2 (High).

CVE-2023-6399: Format String Vulnerability in Zyxel

This vulnerability allows an authenticated IPSec VPN user to perform a denial of service condition against the deviceid daemon.

Successful exploitation of this vulnerability involves sending a crafted hostname to an affected device if the device has the “Device Insight” feature enabled.

The severity for this vulnerability has been given as 5.7 (Medium).

CVE-2023-6764: Format String Vulnerability in Zyxel leading to Unauthenticated RCE

This vulnerability exists in one of the functions of the IPSec VPN feature that could allow a threat actor to achieve unauthenticated remote code execution on the affected device by sending a sequence of specially crafted payloads with an invalid pointer. 

However, this attack requires a detailed knowledge of the affected device’s memory layout and configuration. The severity for this vulnerability has been given as 8.1 (High).

Affected Products And Versions

Users of these products are recommended to upgrade to the latest versions in order to prevent these vulnerabilities from getting exploited by threat actors.

You can block malware, including Trojans, ransomware, spyware, rootkits, worms, and zero-day exploits, with Perimeter81 malware protection. All are extremely harmful, can wreak havoc, and damage your network.

Stay updated on Cybersecurity news, Whitepapers, and Infographics. Follow us on LinkedIn & Twitter.

Eswar
Eswar
Eswar is a Cyber security content editor with a passion for creating captivating and informative content. With years of experience under his belt in Cyber Security, he is covering Cyber Security News, technology and other news.

Latest articles

SHA256 Hash Calculation from Data Chunks

The SHA256 algorithm, a cryptographic hash function, is widely used for securing data integrity...

New Report of of 1M+ Malware Samples Show Application Layer Abused for Stealthy C2

A recent analysis of over one million malware samples by Picus Security has revealed...

Seven-Year-Old Linux Kernel Bug Opens Door to Remote Code Execution

Researchers have uncovered a critical vulnerability in the Linux kernel, dating back seven years,...

Ransomware Payments Plunge 35% as More Victims Refuse to Pay

In a significant shift within the ransomware landscape, global ransom payments plummeted by 35%...

Supply Chain Attack Prevention

Free Webinar - Supply Chain Attack Prevention

Recent attacks like Polyfill[.]io show how compromised third-party components become backdoors for hackers. PCI DSS 4.0’s Requirement 6.4.3 mandates stricter browser script controls, while Requirement 12.8 focuses on securing third-party providers.

Join Vivekanand Gopalan (VP of Products – Indusface) and Phani Deepak Akella (VP of Marketing – Indusface) as they break down these compliance requirements and share strategies to protect your applications from supply chain attacks.

Discussion points

Meeting PCI DSS 4.0 mandates.
Blocking malicious components and unauthorized JavaScript execution.
PIdentifying attack surfaces from third-party dependencies.
Preventing man-in-the-browser attacks with proactive monitoring.

More like this

SHA256 Hash Calculation from Data Chunks

The SHA256 algorithm, a cryptographic hash function, is widely used for securing data integrity...

New Report of of 1M+ Malware Samples Show Application Layer Abused for Stealthy C2

A recent analysis of over one million malware samples by Picus Security has revealed...

Seven-Year-Old Linux Kernel Bug Opens Door to Remote Code Execution

Researchers have uncovered a critical vulnerability in the Linux kernel, dating back seven years,...