Cisco
has released free updates that address the
described in this advisory. Customers may only install and expect
support for software versions and feature sets for which they have
purchased a license. By installing, downloading, accessing, or otherwise
using such software upgrades, customers agree to follow the terms of
the Cisco software license:

https://www.cisco.com/c/en/us/products/end-user-license-agreement.html

Additionally, customers may only download software for which they
have a valid license, procured from Cisco directly, or through a Cisco
authorized reseller or partner. In most cases this will be a maintenance
upgrade to software that was previously purchased. Free
software updates do not entitle customers to a new software license,
additional software feature sets, or major revision upgrades.

When considering software upgrades, customers are advised to
regularly consult the advisories for Cisco products, which are available
from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution.

In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and
software configurations will continue to be supported properly by the
new release. If the information is not clear, customers are advised to
contact the Cisco Technical Assistance Center (TAC) or their contracted
maintenance providers.

Customers Without Service Contracts

Customers who purchase directly from Cisco but do not hold a Cisco
service contract and customers who make purchases through third-party
vendors but are unsuccessful in obtaining fixed software through their
point of sale should obtain upgrades by contacting the Cisco TAC:
https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html

Customers should have the product serial number available and be
prepared to provide the URL of this advisory as evidence of entitlement
to a free upgrade.

Fixed Releases

Cisco fixed this vulnerability in the following SIP Software releases:

  • 11.0(5) (future release) for Cisco Wireless IP 8821 and 8821-EX
  • 12.5(1)SR1 and later for the rest of the Cisco IP Phone

Customers can download the SIP Software from the Software Center on Cisco.com by doing the following:

  1. Click Browse all.
  2. Choose Collaboration Endpoints > IP Phones > IP Phone 8800 Series > [] > Session Initiation Protocol (SIP) Software.
  3. Access releases by using the left pane of the Session Initiation Protocol (SIP) Software page.



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