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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.1893
  Cisco Unified Communications Manager IM and Presence Service SIP Packet
                Processing Denial of Service Vulnerability
                               4 August 2016

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco Unified Communications Manager
Publisher:         Cisco Systems
Operating System:  Cisco
                   Virtualisation
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-1466  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160803-ucm

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Cisco Security Advisory

Cisco Unified Communications Manager IM and Presence Service SIP Packet 
Processing Denial of Service Vulnerability

High

Advisory ID:

cisco-sa-20160803-ucm

Published:

2016 August 3 16:00 GMT

Version 1.0:

Final

CVSS Score:

Base - 7.8

Workarounds:

No workarounds available

Cisco Bug IDs:

CSCva39072

CVE-2016-1466

CWE-399

Summary

A vulnerability in Session Initiation Protocol (SIP) processing functions of 
the Cisco Unified Communications Manager Instant Messaging (IM) and Presence 
Service could allow an unauthenticated, remote attacker to cause the Cisco SIP
Proxy Daemon (sipd) process to restart unexpectedly, resulting in a denial of
service (DoS) condition on a targeted system.

The vulnerability is due to improper input validation of SIP packet headers. 
An attacker could exploit this vulnerability by sending a crafted SIP packet 
to a targeted system. A successful exploit could allow the attacker to cause 
the sipd process to restart unexpectedly, resulting in a DoS condition on the
system. If the sipd process restarts repeatedly, a successful exploit could 
also result in a sustained DoS condition and cause high disk utilization due 
to a large number of sipd core files being written to disk, which could 
exacerbate the DoS condition.

Cisco has released software updates that address this vulnerability. There are
no workarounds that address this vulnerability.

This advisory is available at the following link: 
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160803-ucm

Affected Products

Vulnerable Products

This vulnerability affects Cisco Unified Communications Manager IM and 
Presence Service versions 9.1(1) SU6, 9.1(1) SU6a, 9.1(1) SU7, 10.5(2) SU2, 
10.5(2) SU2a, 11.0(1) SU1, and 11.5(1).

To determine whether a vulnerable version of the Cisco Unified Communications
Manager IM and Presence Service is running on a device, administrators can use
the show version active command in the command-line interface (CLI) for the 
device.

The following example shows the output from a device that is running version 
11.5(1) of the service:

admin: show version active

Active Master Version: 11.5.1.10000-4

Active Version Installed Software Options:

No Installed Software Options Found.

Products Confirmed Not Vulnerable

No other Cisco products are currently known to be affected by this 
vulnerability.

Indicators of Compromise

Exploitation of this vulnerability could cause the sipd process to restart and
generate an sipd core file. If the vulnerability is exploited repeatedly on a
device, a large number of sipd core file could be generated and written to 
disk, causing high disk utilization.

Contact the Cisco Technical Assistance Center (TAC) to review the sipd core 
files and system log files to determine whether the device has been 
compromised by exploitation of this vulnerability.

Administrators can display all active core files on a disk by using the utils
core active list command in the CLI for the device. The names of sipd core 
files will adhere to the following syntax: core.xxxx.sipd.xxxxx

To determine whether sipd core files are using a high percentage of disk 
space, administrators can use the show diskusage common sort command in the 
CLI. To delete sipd core files from a disk, administrators can use the 
following command in the CLI:

 file delete activelog /core/core.*.sipd.* noconfirm

Workarounds

There are no workarounds that address this vulnerability.

Fixed Software

Cisco has released free software updates that address the vulnerability 
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:

http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.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 security 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 consult the Cisco
Security Advisories and Responses archive at http://www.cisco.com/go/psirt and
review subsequent advisories to determine exposure and a complete upgrade 
solution.

In all cases, customers should ensure that the devices to upgrade 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 Technical Assistance Center (TAC):

http://www.cisco.com/en/US/support/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

Customers are advised to install an appropriate fixed release as indicated in
this section.

This vulnerability has been fixed in the following releases:

Version 11.5(1) SU1 for service version 11.5(1)

Cisco Optional Package ciscocm.cup-psirt-sipd-1101-v1.1.cop.sgn for service 
versions 11.0(1)

Cisco Optional Package ciscocm.cup-psirt-sipd-1052-v1.1.cop.sgn for service 
versions 10.5(2)

Cisco Optional Package ciscocm.cup-psirt-sipd-911SU-v1.1.cop.sgn for service 
versions 9.1(1)

Customers can download software for the Cisco Unified Communications Manager 
IM and Presence Service from the Software Center on Cisco.com by navigating to
Products > Unified Communications > Unified Communications Applications > 
Presence Software > Unified Communications Manager IM & Presence Service.

Exploitation and Public Announcements

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any
public announcements or malicious use of the vulnerability that is described 
in this advisory.

Source

This vulnerability was found during the resolution of a support case.

URL

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160803-ucm

Revision History

Version Description 		Section Status 	Date

1.0 	Initial public release. -	Final 	2016-August-03

Legal Disclaimer

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF 
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS
LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO 
CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A standalone copy or paraphrase of the text of this document that omits the 
distribution URL is an uncontrolled copy and may lack important information or
contain factual errors. The information in this document is intended for end 
users of Cisco products.

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