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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
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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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