Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers Management Interface Remote Command Execution and Denial of Service Vulnerabilities

Vulnerability

The vulnerability resides in the web-based management interface of Cisco Small Business RV110W, RV130, RV130W, and RV215W routers. The issue is due to improper validation of user-supplied input, which allows an authenticated attacker to send crafted HTTP requests that can trigger buffer overflows [1]. Affected firmware versions are those shipped with these devices, and no fixed software updates have been released by Cisco [1].

Exploitation

To exploit this vulnerability, an attacker must have valid administrator credentials for the device [1]. The web-based management interface is accessible over the LAN (and over the WAN if remote management is enabled, which is disabled by default) [1]. The attacker sends specially crafted HTTP requests to the vulnerable interface, leveraging the improper input validation to overflow buffers [1].

Impact

A successful exploit allows the attacker to execute arbitrary code as the root user on the underlying operating system, or to cause the device to reload, resulting in a denial of service (DoS) condition [1]. This gives full control over the device in the case of code execution, potentially leading to further network compromise.

Mitigation

Cisco has not released software updates that address these vulnerabilities, and no workarounds are available [1]. The advisory recommends disabling remote management on the WAN interface if it is enabled, and to ensure that the device is only accessible to trusted administrators on the local network [1]. These devices may be end-of-life, and no patches are expected.