Cisco fixes a host of security holes, including latest Apache Struts flaw

A vulnerability in the web-based management interface of the Cisco RV110W Wireless-N VPN Firewall, Cisco RV130W Wireless-N Multifunction VPN Router, and Cisco RV215W Wireless-N VPN Router could allow an unauthenticated, remote attacker to cause a denial of service condition or to execute arbitrary code. The vulnerability is due to improper boundary restrictions on user-supplied input in the Guest user feature of the web-based management interface. An attacker could exploit this vulnerability by sending malicious requests to a targeted device, triggering a buffer overflow condition. A successful exploit could allow the attacker to cause the device to stop responding, resulting in a denial of service condition, or could allow the attacker to execute arbitrary code.

A vulnerability in the Cisco Umbrella API could allow an authenticated, remote attacker to view and modify data across their organization and other organizations. The vulnerability is due to insufficient authentication configurations for the API interface of Cisco Umbrella. An attacker could exploit this vulnerability to view and potentially modify data for their organization or other organizations. A successful exploit could allow the attacker to read or modify data across multiple organizations.

Apache Struts 2 contains an improper input validation flaw (CWE-20) that allows unauthenticated remote code execution when an attacker-controlled namespace (for example, part of the request URL path) is evaluated as an OGNL expression on the server. It is triggered under two circumstances: (1) the alwaysSelectFullNamespace option is true and a result defined in the configuration has no namespace while its parent package's namespace is unset or a wildcard, or (2) a URL tag in a template has no namespace under the same parent-package conditions. An attacker who can reach an application in one of these configurations gains arbitrary code execution with the privileges of the application server, so any organization running affected Struts 2 releases (2.3.7-2.3.34 and 2.5-2.5.16) in such configurations is exposed. CISA added the flaw to its Known Exploited Vulnerabilities catalog on 2021-11-03, confirming exploitation in the wild (ransomware use unknown), and EPSS currently assigns a 100% probability of exploitation within 30 days. CVSS is not yet scored in this feed, but the KEV listing and EPSS signal indicate urgent patching priority.

Do: Upgrade Apache Struts to 2.3.35 or 2.5.17 (or later) on all applications, prioritizing internet-facing ones, per vendor instructions. If upgrading is not immediately possible, set alwaysSelectFullNamespace to false and ensure every result and URL tag specifies an explicit, non-wildcard namespace. Audit configurations, especially applications using the Convention Plugin or wildcard namespaces, for the vulnerable conditions and review web server logs for signs of OGNL injection in namespace values.