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The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has  added  a recently patched critical security flaw in Zyxel gear to its Known Exploited Vulnerabilities ( KEV ) catalog, citing evidence of active exploitation. Tracked as  CVE-2023-28771  (CVSS score: 9.8), the issue relates to a  command injection flaw  impacting different firewall models that could enable an unauthenticated attacker to execute arbitrary code by sending a specially crafted packet to the device. Zyxel addressed the security defect as part of updates released on April 25, 2023. The list of impacted devices is below - ATP (versions ZLD V4.60 to V5.35, patched in ZLD V5.36) USG FLEX (versions ZLD V4.60 to V5.35, patched in ZLD V5.36) VPN (versions ZLD V4.60 to V5.35, patched in ZLD V5.36), and ZyWALL/USG (versions ZLD V4.60 to V4.73, patched in ZLD V4.73 Patch 1) The Shadowserver Foundation, in a  recent tweet , said the flaw is "being actively exploited to build a  Mirai-like botnet " since M

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 notification function that could enable an unauthenticated attacker to cause a denial-of-service (DoS) condition and remote code execution. CVE-2023-33010  - A buffer overflow vulnerability in the ID processing function that could enable an unauthenticated attacker to cause a denial-of-service (DoS) condition and remote code execution. The following devices are impacted - 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

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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 could allow an unauthenticated attacker to execute some OS commands remotely by sending crafted packets to an affected device," Zyxel  said  in an advisory on April 25, 2023. Products impacted by the flaw are - ATP (versions ZLD V4.60 to V5.35, patched in ZLD V5.36) USG FLEX (versions ZLD V4.60 to V5.35, patched in ZLD V5.36) VPN (versions ZLD V4.60 to V5.35, patched in ZLD V5.36), and ZyWALL/USG (versions ZLD V4.60 to V4.73, patched in ZLD V4.73 Patch 1) Zyxel has also  addressed  a high-severity post-authentication command injection vulnerability affecting select firewa

Networking equipment maker Zyxel has released patches for a critical security flaw impacting its network-attached storage (NAS) devices. Tracked as  CVE-2022-34747  (CVSS score: 9.8), the issue relates to a "format string vulnerability" affecting NAS326, NAS540, and NAS542 models. Zyxel credited researcher Shaposhnikov Ilya for reporting the flaw. "A format string vulnerability was found in a specific binary of Zyxel NAS products that could allow an attacker to achieve unauthorized remote code execution via a crafted UDP packet," the company  said  in an advisory released on September 6. The flaw affects the following versions - NAS326 (V5.21(AAZF.11)C0 and earlier) NAS540 (V5.21(AATB.8)C0 and earlier), and NAS542 (V5.21(ABAG.8)C0 and earlier) The disclosure comes as Zyxel previously addressed local privilege escalation and authenticated directory traversal vulnerabilities ( CVE-2022-30526 and CVE-2022-2030 ) affecting its firewall products in July. In J

Zyxel has released  patches  to address four security flaws affecting its firewall, AP Controller, and AP products to execute arbitrary operating system commands and steal select information. The list of security vulnerabilities is as follows - CVE-2022-0734  - A cross-site scripting (XSS) vulnerability in some firewall versions that could be exploited to access information stored in the user's browser, such as cookies or session tokens, via a malicious script. CVE-2022-26531  - Several input validation flaws in command line interface (CLI) commands for some versions of firewall, AP controller, and AP devices that could be exploited to cause a system crash. CVE-2022-26532  - A command injection vulnerability in the " packet-trace " CLI command for some versions of firewall, AP controller, and AP devices that could lead to execution of arbitrary OS commands. CVE-2022-0910  - An authentication bypass vulnerability affecting select firewall versions that could p

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 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

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

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

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