Multiple Vulnerabilities in Cisco Web Security Appliance
cisco-sa-20130626-wsa · Critical · Published · Updated
Cisco IronPort AsyncOS Software for Cisco Web Security Appliance is affected by the following vulnerabilities: Two authenticated command injection vulnerabilities Management GUI Denial of Service Vulnerability These vulnerabilities are independent of each other; a release that is affected by one of the vulnerabilities may not be affected by the others. Successful exploitation of any of the two command injection vulnerabilities could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system with elevated privileges. Successful exploitation of the Management GUI Denial of Service Vulnerability could cause several critical processes to become unresponsive and make the affected system unstable. Cisco has released software updates that address these vulnerabilities. Workarounds that mitigate these vulnerabilities are available. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130626-wsa
All the vulnerabilities described in this security advisory can be mitigated by
disabling management access to the affected system GUI.
Administrators can use the interfaceconifg command to disable appliance management via the GUI. Alternatively, this can be done via the
GUI by editing the management interface properties under Network->IP
interfaces-> Edit and then selecting Disable Appliance Management.
Note: Administrators can manage the affected system via SSH and command-line interface while GUI access is
disabled. However, not all commands and features may be available via command-line interface.
Administrators can also limit the attack surface by restricting IP
addresses that can access the management interface. This can be
done using the adminaccessconfig command and selecting IPACCESS from the menu.
Administrator should also implement Cross-Site Request Forgery protection if available on their platform and software release. This will help limit the attack surface of the command injection vulnerabilities, although will not completely eliminate them.
Additional workaround details are available in the companion Applied Mitigation Bulletin (AMB) at the following location: