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Home > Cybersecurity > Zyxel patches critical vulnerability

Zyxel patches critical vulnerability

Zyxel published a security advisory urging users to apply a patch to address a vulnerability allowing arbitrary code execution.

Erdem Yasar by Erdem Yasar
May 17, 2022
in Cybersecurity
1 min read
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Zyxel released a patch for a vulnerability, tracked as CVE-2022-30525, found in the CGI program of some firewall versions. The vulnerability has a severity score of 9.8 and allows attackers to modify specific files and then execute some OS commands on a vulnerable device. The flaw is currently under attack, thus the company urged users to apply the patch as soon as possible.

OS command injection vulnerability

The vulnerability that affects the Zyxel firewall and VPN devices was discovered by Jacob Baines from Rapid7. Jacob Baines said,

« Commands are executed as the nobody user. This vulnerability is exploited through the /ztp/cgi-bin/handler URI and is the result of passing unsanitized attacker input into the os.system method in lib_wan_settings.py »

Rapid7 stated that they have scanned the internet and found more than 16,000 vulnerable Zyxel products by using the Shodan search platform. Shadowserver stated that it is currently more than 20,8000 Zyxel firewall models that are potentially affected by the vulnerability. Zyxel stated that vulnerable products are:

 

Affected model Affected firmware version Patch availability
USG FLEX 100(W), 200, 500, 700 ZLD V5.00 through ZLD V5.21 Patch 1 ZLD V5.30
USG FLEX 50(W) / USG20(W)-VPN ZLD V5.10 through ZLD V5.21 Patch 1 ZLD V5.30
ATP series ZLD V5.10 through ZLD V5.21 Patch 1 ZLD V5.30
VPN series ZLD V4.60 through ZLD V5.21 Patch 1 ZLD V5.30

See more Cyber Security News


Tags: Zyxel
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Erdem Yasar

Erdem Yasar

Erdem Yasar is a news editor at Cloud7 News. Erdem started his career by writing video game reviews in 2007 for PC World magazine while he was studying computer engineering. In the following years, he focused on software development with various programming languages. After his graduation, he continued to work as an editor for several major tech-related websites and magazines. During the 2010s, Erdem Yasar shifted his focus to cloud computing, hosting, and data centers as they were becoming more popular topics in the tech industry. Erdem Yasar also worked with various industry-leading tech companies as a content creator by writing blog posts and other articles. Prior to his role at Cloud7 News, Erdem was the managing editor of T3 Magazine.

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