Cisco Small Business RV Series Routers Management Interface Remote Command Execution and Denial of Service Vulnerabilities

Vulnerability

The vulnerabilities exist in the web-based management interface of Cisco Small Business RV016, RV042, RV042G, RV082, RV320, and RV325 routers [1]. The issue is due to improper validation of user-supplied input, which allows an authenticated attacker to send crafted HTTP requests. The affected firmware versions are those prior to the fixed releases mentioned in the Cisco advisory [1].

Exploitation

An attacker must have valid administrator credentials for the device [1]. With these credentials, the attacker can send specially crafted HTTP requests to the web-based management interface. No additional network position is required beyond reaching the management interface. The exploitation does not require user interaction from a non-administrator user.

Impact

Successful exploitation allows the attacker to execute arbitrary code as the root user on the underlying operating system, leading to full system compromise [1]. Alternatively, the attacker could cause the device to reload, resulting in a denial of service (DoS) condition. The attacker gains complete control (confidentiality, integrity, availability) at the highest privilege level.

Mitigation

Cisco has released free software updates to fix these vulnerabilities [1]. The advisory provides details on obtaining the fixed firmware. Users should upgrade to the latest available firmware version for their specific router model. There are no workarounds mentioned in the advisory. The vulnerabilities are not listed on the CISA Known Exploited Vulnerabilities (KEV) catalog as of the publication date.