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The Hacker News - Cybersecurity News and Analysis: ZyXEL

Watch Out! Hackers Begin Exploiting Recent Zyxel Firewalls RCE Vulnerability

Watch Out! Hackers Begin Exploiting Recent Zyxel Firewalls RCE Vulnerability
May 16, 2022Ravie Lakshmanan
Image source: z3r00t The U.S. Cybersecurity and Infrastructure Security Agency on Monday  added  two security flaws, including the recently disclosed remote code execution bug affecting Zyxel firewalls, to its  Known Exploited Vulnerabilities Catalog , citing evidence of active exploitation. Tracked as  CVE-2022-30525 , the vulnerability is rated 9.8 for severity and relates to a command injection flaw in select versions of the Zyxel firewall that could enable an unauthenticated adversary to execute arbitrary commands on the underlying operating system. Impacted devices include - USG FLEX 100, 100W, 200, 500, 700 USG20-VPN, USG20W-VPN ATP 100, 200, 500, 700, 800, and VPN series The issue, for which patches were released by the Taiwanese firm in late April (ZLD V5.30), became public knowledge on May 12 following a coordinated disclosure process with Rapid7. Source: Shadowserver Merely a day later, the Shadowserver Foundation  said  it began detecting exploitation attempts,

Zyxel Releases Patch for Critical Firewall OS Command Injection Vulnerability

Zyxel Releases Patch for Critical Firewall OS Command Injection Vulnerability
May 12, 2022Ravie Lakshmanan
Zyxel has moved to address a critical security vulnerability affecting Zyxel firewall devices that enables unauthenticated and remote attackers to gain arbitrary code execution. "A command injection vulnerability in the CGI program of some firewall versions could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device," the company  said  in an advisory published Thursday. Cybersecurity firm Rapid7, which  discovered  and reported the flaw on April 13, 2022, said that the weakness could permit a remote unauthenticated adversary to execute code as the "nobody" user on impacted appliances. Tracked as  CVE-2022-30525  (CVSS score: 9.8), the flaw impacts the following products, with patches released in version ZLD V5.30 - USG FLEX 100(W), 200, 500, 700 USG FLEX 50(W) / USG20(W)-VPN ATP series, and  VPN series Rapid 7 noted that there are at least 16,213 vulnerable Zyxel devices exposed to the internet, making it a

Watch Out! Zyxel Firewalls and VPNs Under Active Cyberattack

Watch Out! Zyxel Firewalls and VPNs Under Active Cyberattack
June 25, 2021Ravie Lakshmanan
Taiwanese networking equipment company Zyxel is warning customers of an ongoing attack targeting a "small subset" of its security products such as firewall and VPN servers. Attributing the attacks to a "sophisticated threat actor," the firm noted that the attacks single out appliances that have remote management or SSL VPN enabled, namely in the USG/ZyWALL, USG FLEX, ATP, and VPN series running on-premise ZLD firmware, implying that the targeted devices are publicly accessible over the internet. "The threat actor attempts to access a device through WAN; if successful, they then bypass authentication and establish SSL VPN tunnels with unknown user accounts, such as 'zyxel_slIvpn', 'zyxel_ts', or 'zyxel_vpn_test', to manipulate the device's configuration," Zyxel said in an  email message , which was shared on Twitter. As of writing, it's not immediately known if the attacks are exploiting previously known vulnerabilities

Secret Backdoor Account Found in Several Zyxel Firewall, VPN Products

Secret Backdoor Account Found in Several Zyxel Firewall, VPN Products
January 01, 2021Ravie Lakshmanan
Zyxel has released a patch to address a critical vulnerability in its firmware concerning a hardcoded, undocumented secret account that could be abused by an attacker to login with administrative privileges and compromise its networking devices. The flaw, tracked as  CVE-2020-29583  (CVSS score 7.8), affects  version 4.60  present in a wide-range of Zyxel devices, including Unified Security Gateway (USG), USG FLEX, ATP, and VPN firewall products. EYE researcher  Niels Teusink  reported the vulnerability to Zyxel on November 29, following which the company released a firmware patch (ZLD V4.60 Patch1) on December 18. According to the  advisory  published by Zyxel, the undocumented account ("zyfwp") comes with an unchangeable password that's not only stored in plaintext but could also be used by a malicious third-party to login to the SSH server or web interface with admin privileges. Zyxel said the hardcoded credentials were put in place to deliver automatic firmware

New Mirai Botnet Variant Found Targeting ZyXEL Devices In Argentina

New Mirai Botnet Variant Found Targeting ZyXEL Devices In Argentina
November 28, 2017Swati Khandelwal
While tracking botnet activity on their honeypot traffic, security researchers at Chinese IT security firm Qihoo 360 Netlab discovered a new variant of Mirai —the well known IoT botnet malware that wreaked havoc last year. Last week, researchers noticed an increase in traffic scanning ports 2323 and 23 from hundreds of thousands of unique IP addresses from Argentina in less than a day. The targeted port scans are actively looking for vulnerable internet-connected devices manufactured by ZyXEL Communications using two default telnet credential combinations— admin/CentryL1nk and admin/QwestM0dem —to gain root privileges on the targeted devices. Researchers believe (instead "quite confident") this ongoing campaign is part of a new Mirai variant that has been upgraded to exploit a newly released vulnerability (identified as CVE-2016-10401 ) in ZyXEL PK5001Z modems. "ZyXEL PK5001Z devices have zyad5001 as the su (superuser) password, which makes it easier for rem
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