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Rewterz penetration testing services help organizations determine if a cyber attacker can gain access to their critical assets while giving them detailed insights of the overall business impact of a cyber attack.
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September 19, 2023
Severity High Analysis Summary A new information-stealing malware called Mystic Stealer emerged in April 2023, gaining popularity in cybercrime circles. It targets various web browsers, browser […]September 19, 2023Rewterz Threat Alert – BlackCat/ALPHV Ransomware Group Allegedly Encrypted Over 100 MGM ESXi Servers
Severity High Analysis Summary An affiliate of the BlackCat ransomware group, also known as APLHV, recently carried out a significant cyberattack on MGM Resorts, leading to […]September 19, 2023Severity High Analysis Summary APT37, also known as ScarCruft or Red Eyes, is a state-sponsored cyber espionage group originating from North Korea. The group has been […]Threat Insights
Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.
Connect with Us
Platform
Managed Security Services
Managed Penetration Testing
Rewterz penetration testing services help organizations determine if a cyber attacker can gain access to their critical assets while giving them detailed insights of the overall business impact of a cyber attack.
Resources
September 19, 2023Severity High Analysis Summary A new information-stealing malware called Mystic Stealer emerged in April 2023, gaining popularity in cybercrime circles. It targets various web browsers, browser […]September 19, 2023Rewterz Threat Alert – BlackCat/ALPHV Ransomware Group Allegedly Encrypted Over 100 MGM ESXi Servers
Severity High Analysis Summary An affiliate of the BlackCat ransomware group, also known as APLHV, recently carried out a significant cyberattack on MGM Resorts, leading to […]September 19, 2023Severity High Analysis Summary APT37, also known as ScarCruft or Red Eyes, is a state-sponsored cyber espionage group originating from North Korea. The group has been […]Threat Insights
Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.
Connect with Us
Rewterz Threat Alert – DarkCrystal RAT (DCRat) – Active IOCs
July 19, 2023Rewterz Threat Advisory – Multiple Cisco Small Business SPA500 Series IP Phones Vulnerabilities
July 20, 2023
Severity
High
Analysis Summary
CVE-2023-33012 CVSS:8.8
Multiple Zyxel firewalls and WLAN controllers could allow a remote attacker to execute arbitrary commands on the system. By using a crafted GRE configuration, an attacker could exploit this vulnerability to execute arbitrary commands on the system.
CVE-2023-33011 CVSS:8.8
Multiple Zyxel firewalls and WLAN controllers could allow a remote attacker to execute arbitrary commands on the system. By using a crafted PPPoE configuration, an attacker could exploit this vulnerability to execute arbitrary commands on the system.
CVE-2023-34138 CVSS:8
Zyxel firewalls and controllers could allow a remote attacker within the local network to execute arbitrary commands on the system, caused by an OS command injection vulnerability in the hotspot management feature. By tricking an authorized administrator to add their IP address to the list of trusted RADIUS clients, an attacker could exploit this vulnerability to execute arbitrary commands on the system.
CVE-2023-34139 CVSS:8.8
Zyxel firewalls could allow a remote attacker within the local network to execute arbitrary commands on the system, caused by an OS command injection vulnerability in the Free Time WiFi hotspot feature. An attacker could exploit this vulnerability to execute arbitrary commands on the system.
CVE-2023-34140 CVSS:6.5
Zyxel firewalls and controllers are vulnerable to a denial of service, caused by a buffer overflow. By sending a specially crafted request to the CAPWAP daemon, a remote attacker within the local network could exploit this vulnerability to cause a denial of service.
CVE-2023-34141 CVSS:8
Zyxel firewalls and controllers could allow a remote attacker within the local network to execute arbitrary commands on the system, caused by a command injection vulnerability. By tricking an authorized administrator to add their IP address to the managed AP list, an attacker could exploit this vulnerability to execute arbitrary commands on the system.
Impact
- Command Execution
- Denial of Service
Indicators Of Compromise
CVE
- CVE-2023-33012
- CVE-2023-33011
- CVE-2023-34138
- CVE-2023-34139
- CVE-2023-34140
- CVE-2023-34141
Affected Vendors
Zyxel
Affected Products
- Zyxel ATP series firmware 5.10
- Zyxel ATP series firmware 5.36 Patch 2
- Zyxel USG FLEX series firmware 5.00
- Zyxel USG FLEX series firmware 5.36 Patch 2
- Zyxel USG FLEX 50(W) / USG20(W)-VPN series firmware 5.10
- Zyxel USG FLEX 50(W) / USG20(W)-VPN series firmware 5.36 Patch 2
- Zyxel VPN series firmware 5.00
- Zyxel VPN series firmware 5.36 Patch 2
- Zyxel ATP ZLD 5.31
- Zyxel USG FLEX ZLD 5.31
- Zyxel USG FLEX 50(W) / USG20(W)-VPN ZLD 5.00
- Zyxel VPN ZLD 5.00
Remediation
Refer to the Zyxel Web site for patch, upgrade or suggested workaround information.