CISA adds CVE-2022-30525 flaw in Zyxel Firewalls to its Known Exploited Vulnerabilities Catalog

US Critical Infrastructure Security Agency (CISA) adds critical CVE-2022-30525 RCE flaw in Zyxel Firewalls to its Known Exploited Vulnerabilities Catalog.

The U.S. Cybersecurity and Infrastructure Security Agency added the recently disclosed remote code execution bug, tracked as CVE-2022-30525, affecting Zyxel firewalls, to its Known Exploited Vulnerabilities Catalog.

According to Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities, FCEB agencies have to address the identified vulnerabilities by the due date to protect their networks against attacks exploiting the flaws in the catalog.

Experts recommend also private organizations review the Catalog and address the vulnerabilities in their infrastructure.

Last week, Zyxel has addressed the critical CVE-2022-30525 (CVSS score: 9.8) affecting Zyxel firewall devices that enables unauthenticated and remote attackers to gain arbitrary code execution as the “nobody” user.

The vulnerability was discovered by Rapid7 which reported it on April 13. Zyxel silently addressed the flaw by releasing security updates on April 28, 2022, Rapid7 pointed out that this choice leaves defenders in the dark and only advantages the attackers.

“The affected models are vulnerable to unauthenticated and remote command injection via the administrative HTTP interface. Commands are executed as the nobody user.” reads the report published by Rapid7.

Below is the list of vulnerable products and related patches:

USG FLEX 100(W), 200, 500, 700ZLD V5.00 through ZLD V5.21 Patch 1ZLD V5.30
USG FLEX 50(W) / USG20(W)-VPNZLD V5.10 through ZLD V5.21 Patch 1ZLD V5.30
ATP seriesZLD V5.10 through ZLD V5.21 Patch 1ZLD V5.30
VPN seriesZLD V4.60 through ZLD V5.21 Patch 1ZLD V5.30

According to Rapid 7, there are more than 15,000 internet-facing vulnerable systems tracked by the Shodan search engine. The researchers also developed a Metasploit module for this issue and published a video PoC of the attack:

“Apply the vendor patch as soon as possible. If possible, enable automatic firmware updates. Disable WAN access to the administrative web interface of the system.” concludes the report.

Researchers at Shadowserver Foundation reported they started observing exploitation attempts of CVE-2022-30525 starting on May 13th. The experts claim that at least 20 800 of the potentially affected Zyxel firewall models (by unique IP) are exposed online, the majority of the CVE-2022-30525 affected models are in the EU – France (4.5K) and Italy (4.4K) and the US (2.4K).

Cisa also added the CVE-2022-22947 code injection vulnerability in Spring Cloud Gateway to the catalog. A remote attacker could send specially-crafted requests to vulnerable systems to gain arbitrary code execution. Last week, Microsoft experts reported that the Sysrv-K botnet is exploiting this issue to take over the vulnerable web servers.

Both issues have to be addressed by federal agencies by June 6.

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Pierluigi Paganini

(SecurityAffairs – hacking, domain name system)

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Pierluigi Paganini: Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer. Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US. Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.

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