Headline
Zyxel Firewalls Under Attack! Urgent Patching Required
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Monday placed two recently disclosed flaws in Zyxel firewalls to its Known Exploited Vulnerabilities (KEV) catalog, based on evidence of active exploitation. The vulnerabilities, tracked as CVE-2023-33009 and CVE-2023-33010, are buffer overflow vulnerabilities that could enable an unauthenticated attacker to cause a
Network Security / Vulnerability
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Monday placed two recently disclosed flaws in Zyxel firewalls to its Known Exploited Vulnerabilities (KEV) catalog, based on evidence of active exploitation.
The vulnerabilities, tracked as CVE-2023-33009 and CVE-2023-33010, are buffer overflow vulnerabilities that could enable an unauthenticated attacker to cause a denial-of-service (DoS) condition and remote code execution.
Patches to plug the security holes were released by Zyxel on May 24, 2023. The following list of devices are affected -
- ATP (versions ZLD V4.32 to V5.36 Patch 1, patched in ZLD V5.36 Patch 2)
- USG FLEX (versions ZLD V4.50 to V5.36 Patch 1, patched in ZLD V5.36 Patch 2)
- USG FLEX50(W) / USG20(W)-VPN (versions ZLD V4.25 to V5.36 Patch 1, patched in ZLD V5.36 Patch 2)
- VPN (versions ZLD V4.30 to V5.36 Patch 1, patched in ZLD V5.36 Patch 2), and
- ZyWALL/USG (versions ZLD V4.25 to V4.73 Patch 1, patched in ZLD V4.73 Patch 2)
While the exact nature of the attacks is unknown, the development comes days after another flaw in Zyxel firewalls (CVE-2023-28771) has been actively exploited to ensnare susceptible devices into a Mirai botnet.
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Federal Civilian Executive Branch (FCEB) agencies are required to remediate identified vulnerabilities by June 26, 2023, to secure their networks against possible threats.
Zyxel, in a new guidance issued last week, is also urging customers to disable HTTP/HTTPS services from WAN unless “absolutely” required and disable UDP ports 500 and 4500 if not in use.
The development also comes as the Taiwanese company fixes for two flaws in GS1900 series switches (CVE-2022-45853) and 4G LTE and 5G NR outdoor routers (CVE-2023-27989) that could result in privilege escalation and denial-of-service (DoS).
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Zyxel has released software updates to address two critical security flaws affecting select firewall and VPN products that could be abused by remote attackers to achieve code execution. Both the flaws – CVE-2023-33009 and CVE-2023-33010 – are buffer overflow vulnerabilities and are rated 9.8 out of 10 on the CVSS scoring system. A brief description of the two issues is below - CVE-2023-33009 -
Zyxel has released software updates to address two critical security flaws affecting select firewall and VPN products that could be abused by remote attackers to achieve code execution. Both the flaws – CVE-2023-33009 and CVE-2023-33010 – are buffer overflow vulnerabilities and are rated 9.8 out of 10 on the CVSS scoring system. A brief description of the two issues is below - CVE-2023-33009 -
Zyxel has released software updates to address two critical security flaws affecting select firewall and VPN products that could be abused by remote attackers to achieve code execution. Both the flaws – CVE-2023-33009 and CVE-2023-33010 – are buffer overflow vulnerabilities and are rated 9.8 out of 10 on the CVSS scoring system. A brief description of the two issues is below - CVE-2023-33009 -
A buffer overflow vulnerability in the ID processing function in Zyxel ATP series firmware versions 4.32 through 5.36 Patch 1, USG FLEX series firmware versions 4.50 through 5.36 Patch 1, USG FLEX 50(W) firmware versions 4.25 through 5.36 Patch 1, USG20(W)-VPN firmware versions 4.25 through 5.36 Patch 1, VPN series firmware versions 4.30 through 5.36 Patch 1, ZyWALL/USG series firmware versions 4.25 through 4.73 Patch 1, could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and even a remote code execution on an affected device.
A buffer overflow vulnerability in the ID processing function in Zyxel ATP series firmware versions 4.32 through 5.36 Patch 1, USG FLEX series firmware versions 4.50 through 5.36 Patch 1, USG FLEX 50(W) firmware versions 4.25 through 5.36 Patch 1, USG20(W)-VPN firmware versions 4.25 through 5.36 Patch 1, VPN series firmware versions 4.30 through 5.36 Patch 1, ZyWALL/USG series firmware versions 4.25 through 4.73 Patch 1, could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and even a remote code execution on an affected device.
Networking equipment maker Zyxel has released patches for a critical security flaw in its firewall devices that could be exploited to achieve remote code execution on affected systems. The issue, tracked as CVE-2023-28771, is rated 9.8 on the CVSS scoring system. Researchers from TRAPA Security have been credited with reporting the flaw. "Improper error message handling in some firewall versions
Improper error message handling in Zyxel ZyWALL/USG series firmware versions 4.60 through 4.73, VPN series firmware versions 4.60 through 5.35, USG FLEX series firmware versions 4.60 through 5.35, and ATP series firmware versions 4.60 through 5.35, which could allow an unauthenticated attacker to execute some OS commands remotely by sending crafted packets to an affected device.