There are critical vulnerabilities that could allow attackers to gain root access to Cisco networking products for small businesses, the networking giant said.

The affected products include the WAP4410N Wireless-N Access Point, the WRVS4400N Wireless-N Gigabit Security Router, and the RVS4000 4-port Gigabit Security Router, Cisco said in a security advisory Friday.

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These products are all under the brand Cisco and not Linksys. Cisco marketed consumer and small business networking equipment under the Linksys brand for ten years beginning in 2003, but sold the division to Belkin in January 2013.

According to Cisco’s advisory, the vulnerabilities in all three products stem from an undocumented test interface that listens on TCP port 32764 on the affected devices.

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Attackers can potentially exploit that interface to execute arbitrary commands on the underlying operating system, the advisory explains. By doing so, they can potentially gain the administrator password to the advice, which would then allow them to execute commands with elevated privileges, Cisco said.

The most obvious use for such an exploit would be to trigger a denial-of-service (DoS) attack on a network by freezing up the router or resetting it to its factory default configuration.

Cisco has ranked the vulnerabilities at 10.0 on the Common Vulnerability Scoring System (CVSS) – the highest possible score, which indicates a critical flaw.

On top of that public exploit code for the vulnerabilities is already available, although Cisco said it has not seen any widespread attacks based on the exploit so far.

There are no known workarounds for the vulnerabilities and Cisco has not released any patches yet, although it promises it will ship fixes for all three routers by the end of January 2014.

Click here to view the security advisory.


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