Friday, May 24, 2024

Linksys Router Flaw Let Attackers Perform Command Injection, PoC Released

Linksys routers were discovered with two vulnerabilities: CVE-2024-33788 and CVE-2024-33789.

These vulnerabilities were associated with Command Injection on Linksys routers.

The severity of these vulnerabilities is yet to be categorized. However, a proof-of-concept has been published for these two vulnerabilities.

These vulnerabilities existed in Linksys E5000 routers, which had insufficient validation of user inputs.

Threat actors can exploit this vulnerability and execute unauthorized commands on the affected devices. 

CVE-2024-33788: Command Injection Flaw

This vulnerability exists due to an insufficient validation of input, which arises when registering a device PIN number in the Configure → Wi-Fi → Wi-Fi Protect Config Setting.

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This value is provided as input inside the squashfs-root/usr/share/lua/runtime.lua at line number 1561.

At this line of code in the file, there is a pt[”PinCode”], which is not filtered and gets executed directly on the next line where there is a “os.execute(cmd)”.

If the PIN code is provided with a malicious command, it gets executed as output on the router leading to a command injection vulnerability.

CVE-2024-33789: Command Injection through Ping

This is also a command injection vulnerability that exists due to insufficient verification of the input value for the IP or URL address when executing the ping command.

This ping test is present in the router’s TroubleShooting → Diagnostics menu as a means of checking the connectivity.

However, this value is provided as an input to the squashfs-root/usr/share/lua/runtime.lua file at line 491.

This line of code consists of pt[“ipurl”] which is not filtered. Additionally, this value gets executed on the next line which contains the “os.execute(cmd)”.

Hence, providing a malicious value as URL or IP address for the ping command results in command injection vulnerability.

Nevertheless, to exploit these vulnerabilities, a threat actor will need a certain level of permissions on the vulnerable router.

Users of these products are recommended to upgrade to the latest versions to prevent threat actors from exploiting these vulnerabilities.

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Eswar
Eswar
Eswar is a Cyber security content editor with a passion for creating captivating and informative content. With years of experience under his belt in Cyber Security, he is covering Cyber Security News, technology and other news.

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