Multiple Cisco Small Business devices contain an undocumented network interface that could allow unauthorized access. Updates will be available by the end of January 2014.
A vulnerability in the underlying operating system of the affected devices could allow an unauthenticated, remote attacker unauthorized access to the affected device.
The vulnerability is due to a service listening on TCP port 32764 of the affected device. An unauthenticated, remote attacker could exploit this vulnerability by accessing the affected device from the wireless LAN (WLAN) or the physical LAN interface and issuing arbitrary commands in the underlying operating system. Successful exploitation could allow the attacker to gain access to user credentials for the administrator account of the device or execute commands with elevated privileges.
Cisco has confirmed the vulnerability in a security advisory. Software updates will be available by the end of January 2014.
The following devices are affected:
Cisco RVS4000 4-port Gigabit Security Router firmware version 220.127.116.11 and prior
Cisco WRVS4400N Wireless-N Gigabit Security Router firmware version 1.1.13 and 18.104.22.168 and prior
Cisco WAP4410N Wireless-N Access Point firmware version 22.214.171.124 and prior
The exposed interface is available only on the LAN connection interface for the two affected routers, the Cisco RVS4000 4-port Gigabit Security Router and the Cisco WRVS4400N Wireless-N Gigabit Security Router, reducing the potential source of exploitation to internal networks. The interface is accessible from the wireless interface on the Cisco WAP4410N Wireless-N Access Point, making exploitation easier for attackers within wireless communication range.
An unauthenticated, remote attacker could exploit the vulnerability to gain unauthorized access to a vulnerable device. The attacker could leverage the access to issue arbitrary commands or access authentication credentials.
The vulnerability is due to an undocumented test network interface. The interface allows for remote, unauthenticated access to the device.
An unauthenticated, remote attacker could exploit this vulnerability by connecting directly to the exposed interface via TCP port 32764. The attacker could issue commands within the interface or gain access to user credentials on the device, resulting in a complete device compromise.
Administrators are advised to apply the appropriate updates.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators are advised to monitor affected systems.
Software updates will be available by the end of January 2014.
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