Cisco Security Advisory
Click Icon to Copy Verbose Score
AV:N/AC:L/Au:N/C:N/I:N/A:C/E:POC/RL:OF/RC:C
-
A denial of service (DoS) vulnerability exists in Cisco Unified Presence and Jabber Extensible Communications Platform (Jabber XCP). An unauthenticated, remote attacker could exploit this vulnerability by sending a specially crafted Extensible Messaging and Presence Protocol (XMPP) stream header to an affected server. Successful exploitation of this vulnerability could cause the Connection Manager process to crash. Repeated exploitation could result in a sustained DoS condition.
There are no workarounds available to mitigate exploitation of this vulnerability.
Cisco has released software updates that address this vulnerability. This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120912-cupxcp
-
Vulnerable Products
The following versions of Cisco Unified Presence and Jabber Extensible Communications Platform (Jabber XCP) are affected by the vulnerability in this advisory. JabberNow appliances are also affected if they are running a vulnerable version of Jabber XCP software.
Cisco Unified Presence
All versions of Cisco Unified Presence prior to 8.6(3) are affected by the vulnerability in this advisory.
Jabber XCP and JabberNow Appliances
All versions of Jabber XCP software prior to 5.3 are affected by the vulnerability in this advisory.
Determining Cisco Unified Presence Software Versions
To determine the running version of Cisco Unified Presence software, issue the show version active command from the command line interface.
The following example shows Cisco Unified Presence software version 8.6.0:
admin: show version active Active Master Version: 8.6.0.97041-43
Determining Jabber XCP Software Versions
To determine the running version of Jabber XCP software, find the JABBER_VERSION in the [JABBER_HOME]/var/cache/xcp_vars.sh file.
The following example shows Jabber XCP software version 5.8.1.17421:
$ cat [JABBER_HOME]/var/cache/xcp_var.sh | grep JABBER_VERSION JABBER_VERSION=5.8.1.17421
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this vulnerability.
-
Cisco Unified Presence and Jabber XCP provide an open and extensible platform that facilitates the secure exchange of availability and instant messaging (IM) information.
Cisco Unified Presence contains a vulnerability that could allow an unauthenticated, remote attacker to cause a DoS condition.
Jabber Extensible Communications Platform, including JabberNow Appliance, contains a vulnerability that could allow an unauthenticated, remote attacker to cause a DoS condition.
XMPP clients initiate communication with an XMPP server by sending a stream header using IP version 4 (IPv4) or IP version 6 (IPv6). The vulnerability is due to the incorrect handling of stream headers. An attacker could exploit this vulnerability by sending a specially crafted XMPP stream header to an affected system. A successful exploit could cause the Connection Manager processes to terminate, resulting in dropped connections for existing clients and preventing new clients from connecting. The Connection Manager processes will restart automatically. However, repeated exploitation could create a sustained DoS condition.
This vulnerability is documented in Cisco bug ID CSCtu32832 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2012-3935.
More information about XMPP stream headers is available in RFC 6120.
-
There are no available workarounds to mitigate this vulnerability.
Additional mitigations that can be deployed on Cisco devices within the network are available in the Cisco Applied Intelligence companion document for this Advisory: https://sec.cloudapps.cisco.com/security/center/viewAMBAlert.x?alertId=26732
-
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 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.
Cisco Unified Presence Software Version
First Fixed Release
All versions prior to 8.6(3)
Upgrade to 8.6(3) or higher
Jabber XCP Software Version, Including JabberNow Appliances
First Fixed Release
All versions prior to 5.3
Upgrade to 5.3 or higher
-
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.
The vulnerability described in this advisory was found during internal testing.
-
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
-
Show LessRevision 1.0 2012-September-12 Initial public release
-
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 stand-alone 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.