CVE-2018-3954 Command injection in ESeries E1200

High 7.2 Published 17 Oct 2018 Updated 17 Sep 2024

Attackers can execute arbitrary OS commands on Linksys E-Series routers by injecting malicious data into the Router Name field via the web interface.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-3954?

CVE-2018-3954 is a high-severity command injection vulnerability in Linksys ESeries E1200, published on 17 Oct 2018. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

Devices in the Linksys ESeries line of routers (Linksys E1200 Firmware Version 2.0.09 and Linksys E2500 Firmware Version 3.0.04) are susceptible to OS command injection vulnerabilities due to improper filtering of data passed to and retrieved from NVRAMData entered into the 'Router Name' input field through the web portal is submitted to apply.cgi as the value to the 'machine_name' POST parameter. When the 'preinit' binary receives the SIGHUP signal it enters a code path that calls a function named 'set_host_domain_name' from its libshared.so shared object.

Weakness: CWE-78

Which versions are affected by CVE-2018-3954?

It affects 2 products.

Products include Linksys E1200 Firmware, Linksys E2500 Firmware.

How do I fix CVE-2018-3954?

No fix has been published for CVE-2018-3954 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2018-3954 being exploited?

There is no known exploitation of CVE-2018-3954 in the wild and no public exploit code.

Sources

Also known as GHSA-5g8c-mfvh-j87f.