Cisco released software updates this week to patch several high severity vulnerabilities in the company’s cable modems, residential gateways and security appliances.
A couple of serious flaws in Cisco’s residential gateways were reported by Kyle Lovett, and Chris Watts of Tech Analysis.
Lovett discovered an information disclosure vulnerability (CVE-2016-1325) that allows a remote, unauthenticated attacker to access sensitive data on affected devices. The issue, caused by improper access restrictions, affects the Cisco DPC3941 Wireless Residential Gateway with Digital Voice and the DPC3939B Wireless Residential Voice Gateway.
Watts identified a denial-of-service (DoS) flaw affecting the Cisco DPQ3925 8x4 DOCSIS 3.0 Wireless Residential Gateway. The expert discovered that the devices improperly handle, process and terminate HTTP requests, allowing a remote, unauthenticated attacker to cause the system to enter a DoS condition (CVE-2016-1326).
Watts also informed Cisco of a high severity remote code execution vulnerability (CVE-2016-1327) in Cable Modem with Digital Voice models DPC2203 and EPC2203. An attacker can remotely exploit this weakness to trigger a buffer overflow and execute arbitrary code by sending a specially crafted HTTP request to vulnerable devices.
Cisco also published an advisory this week to describe a DoS issue affecting the HTTPS inspection engine of the Cisco ASA Content Security and Control Security Services Module (CSC-SSM). The vulnerability, caused by improper handling of HTTPS packets, allows a remote, unauthenticated attacker to reload affected devices by sending HTTPS packets at a high rate.
The flaw (CVE-2016-1312), identified by Cisco during the resolution of a support case, affects ASA 5500 Series CSC-SSM devices running any 6.6 release prior to 6.6.1164.0. Customers can address the issue by updating to version 6.6.1164.0 or by applying the 1157 hotfix.
Cisco is not aware of any instances in which these vulnerabilities have been exploited for malicious purposes. Workarounds are not available for any of the flaws.