When Internet Explorer is used, the AnyConnect VPN server provides an ActiveX control that downloads and installs the AnyConnect client software.One of the components provided by Cisco AnyConnect for use with Internet Explorer is an ActiveX control called the CISCO Portforwarder Control.This ActiveX control is provided by the file ciscopf.ocx.
The Cisco Portforwarder ActiveX control contains a buffer overflow in its initialization parameters. We have confirmed that version 1.0.1.8 of the Portforwarder control is vulnerable. Please note that updating a Cisco ASA device with the fixed software will not protect systems that have already downloaded the vulnerable control. Cisco Ssl Vpn Port Forwarder Activex How To Set ThePlease also consider the following workarounds: Disable the Cisco AnyConnect Portforwarder ActiveX control in Internet Explorer The vulnerable Cisco AnyConnect Portforwarder ActiveX control can be disabled in Internet Explorer by setting the kill bit for the following CLSID: B8E73359-3422-4384-8D27-4EA1B4C01232 More information about how to set the kill bit is available in Microsoft Support Document 240797. Port forwarding was the first method of application access deployed by Cisco for SSL VPN way back version numbers 7.x. The ASA admin must first create a new port forwarding list consisting of a name, the local forwarded port on the client machine, the remoteapplication server name, the application servers port, and a description. The port forwarding list is then made available through a Java applet that automatically opens when the user logs in to the SSL VPN portal or clicks the Application Access pane from within the portal and chooses Start Application Access. Upon starting application access, a Java applet is downloaded to the client, and an entry is created in the local hosts file of the users PC, which contains the application servers name and the local machines loopback address. The application in use must be configured to send its traffic via the local port as configured in the port forwarding entry on the ASA. With the Java applet open, all traffic originating from Telnet is sent via the SSL tunnel to the ASA. The ASA then establishes a TCP session with the destination server and relays any application data between the client and server. The drawbacks with this solution is that client application must be installed locally on the users machine and it requires administrative access. It can also operate with simple applications that runs only on static TCP ports. MY-ASA-FW(config) webvpn MY-ASA-FW(config-webvpn) WebVPN commands: anyconnect AnyConnect configuration parameters anyconnect-essentials EnableDisable AnyConnect Essentials apcf Load Aplication Profile Customization Framework (APCF) profile auto-signon Configure auto-sign to allow login to certain applications using the WebVPN session credentials cache Configure WebVPN cache certificate-group-map Associate a tunnel-group with a certificate map rule character-encoding Configures the character encoding for WebVPN portal pages csd This specifies whether Cisco Secure Desktop is enabled and the package file name to be used. Cisco Ssl Vpn Port Forwarder Activex Password On TheUSE ONLY IF ADVISED BY CISCO mobile-device Configure access from mobile devices mus Configure Mobile User Security no Remove a WebVPN command or set to its default onscreen-keyboard Adds WebVPN onscreen keyboard for typing password on the WebVPN logon page and internal pages requiring authentication port WebVPN should listen for connections on the specified port port-forward Configure the port-forward list for WebVPN portal-access-rule Configuration related to portal access rules proxy-bypass Configure proxy bypass rewrite Configure content rewriting rule smart-tunnel Configure a list of programs to use smart tunnel sso-server Configure an SSO Server tunnel-group-list Configure WebVPN group list dropdown in login page tunnel-group-preference EnableDisable Tunnel Group Preference MY-ASA-FW(config-webvpn) port-forward webvpn mode commandsoptions: WORD This is the port that the WebVPN user connects to on their local workstation. Use a port number greater than 1024 to avoid conflicts with existing services. MY-ASA-FW(config-webvpn) port-forward PF-TELNET 2300 webvpn mode commandsoptions: A.B.C.D Enter an IP address for the Remote Server WORD This is the port on the remote server that connections to the local port will be forwarded to. Just click on the Start Application button and a pop-up window appears that runs Java. Open a command prompt and Telnet using the PCs loopback address 127.0.0.1 and the local port number defined on the ASA. I currently hold EC-Council CEH, CompTIA Network, Security, CySA, Palo Alto ACE and PCCSA, ITIL Foundation, Cisco CCNP Security, CCNP Enterprise, CCNA Cyber Ops, CWTS, Juniper JNCIA-Junos and Microsoft Azure Fundamentals.
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