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.

Integrate ANY.RUN in Your Company for Effective Malware Analysis

Are you from SOC, Threat Research, or DFIR departments? If so, you can join an online community of 400,000 independent security researchers:

• Real-time Detection
• Interactive Malware Analysis
• Easy to Learn by New Security Team members
• Get detailed reports with maximum data
• Set Up Virtual Machine in Linux & all Windows OS Versions
• Interact with Malware Safely

If you want to test all these features now with completely free access to the sandbox:

Try ANY.RUN for FREE

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.

Is Your Network Under Attack? - Read CISO’s Guide to Avoiding the Next Breach - Download Free Guide