Taiwan-based networking device manufacturer Zyxel is urging customers to update the firmware of ATP, USG Flex, VPN, and ZyWALL/USG firewall devices, to prevent the exploitation of recently patched vulnerabilities.
Tracked as CVE-2023-28771, CVE-2023-33009 and CVE-2023-33010, the issues can lead to OS command execution, remote code execution (RCE), and denial-of-service (DoS).
The first of the issues came to light in late April, when Zyxel released patches for it, warning that it can be exploited remotely without authentication by sending specially crafted packets to a vulnerable device.
In mid-May, after security researchers reproduced the exploit targeting CVE-2023-28771, Rapid7 warned that the vulnerability would likely be mass-exploited in the wild, considering that there were tens of thousands of Zyxel device web interfaces accessible from the internet.
Shortly after, a Mirai variant was seen exploiting the bug to ensnare unpatched devices in a DDoS-capable botnet. Around the same time, Zyxel released patches for CVE-2023-33009 and CVE-2023-33010.
Now, Zyxel once again raises the alarm on the ongoing attacks, urging customers to install the available patches as soon as possible, to prevent exploitation.
The manufacturer notes that it previously alerted customers of the available patches through multiple channels, including security advisory newsletter, push notifications via web GUIs, and scheduled firmware upgrades for cloud-based devices.
The company also advises customers to disable HTTP/HTTPS services from the WAN if unused, enable policy control and only allow access from trusted IPs, enable geoIP filtering, and disable UDP ports 500 and 4500 if unused.
To identify potential malware infections, customers should look for symptoms such as unresponsive devices, unreachable web GUIs or SSH management interfaces, network interruptions, and disconnecting VPN connections.
Additional information on the addressed vulnerabilities can be found on Zyxel’s security advisories page.
Related: Zyxel Patches Critical Vulnerability in NAS Firmware
Related: Technical Details Released for Recently Patched Zyxel Firewall Vulnerabilities
Related: Zyxel Firewall Vulnerability Exploitation Attempts Seen One Day After Disclosure
More from Ionut Arghire
- Generative AI Startup Nexusflow Raises $10.6 Million
- Researchers Extract Sounds From Still Images on Smartphone Cameras
- Hackers Set Sights on Apache NiFi Flaw That Exposes Many Organizations to Attacks
- Cloudflare Users Exposed to Attacks Launched From Within Cloudflare: Researchers
- FBI Warns Organizations of Dual Ransomware, Wiper Attacks
- Lumu Raises $30 Million for Threat Detection and Response Platform
- Cisco Warns of IOS Software Zero-Day Exploitation Attempts
- Russian Zero-Day Acquisition Firm Offers $20 Million for Android, iOS Exploits
Latest News
- Bankrupt IronNet Shuts Down Operations
- AWS Using MadPot Decoy System to Disrupt APTs, Botnets
- Generative AI Startup Nexusflow Raises $10.6 Million
- In Other News: RSA Encryption Attack, Meta AI Privacy, ShinyHunters Hacker Guilty Plea
- Researchers Extract Sounds From Still Images on Smartphone Cameras
- National Security Agency is Starting an Artificial Intelligence Security Center
- CISA Warns of Old JBoss RichFaces Vulnerability Being Exploited in Attacks
- Hackers Set Sights on Apache NiFi Flaw That Exposes Many Organizations to Attacks
