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ESB-2016.0013.2 - UPDATE [Win] Cisco Jabber: Access privileged data - Remote/unauthenticated

Date: 04 February 2016

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                              ESB-2016.0013.2
         Cisco Jabber for Windows STARTTLS Downgrade Vulnerability
                              4 February 2016

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

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

Product:           Cisco Jabber
Publisher:         Cisco Systems
Operating System:  Windows
Impact/Access:     Access Privileged Data         -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-6409  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151224-jab

Revision History:  February 4 2016: Updated information about the availability of fixed releases
                   January  4 2016: Initial Release

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Jabber STARTTLS Downgrade Vulnerability

Medium

Advisory ID:

cisco-sa-20151224-jab

Last Updated:

2016 February 3 21:33 GMT

Published:

2015 December 24 18:30 GMT

Version 2.1:

Final

CVSS Score:

Base - 4.3

Workarounds:

No workarounds available

Cisco Bug IDs:

CSCux74848

CSCux74895

CSCux74900

CSCux80122

CSCux88529

CVE-2015-6409

CWE

Summary

A vulnerability in the Cisco Jabber client could allow an unauthenticated, 
remote attacker to perform a STARTTLS downgrade attack.

The vulnerability exists because the client does not verify that an Extensible
Messaging and Presence Protocol (XMPP) connection has been established with 
Transport Layer Security (TLS). An attacker could exploit this vulnerability 
by performing a man-in-the-middle attack to tamper with the XMPP connection 
and avoid TLS negotiation. A successful exploit could allow the attacker to 
cause the client to establish a cleartext XMPP connection.

Cisco will release software updates that address this vulnerability. 
Workarounds that address this vulnerability are not available.

This advisory is available at the following link: 
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151224-jab

Affected Products

Vulnerable Products

The following table lists Cisco products that are affected by the 
vulnerability that is described in this advisory.

Product 			Defect 		Fixed Release Availability

Client Side
    
Cisco Jabber for Windows	CSCux88529 	11.5(1) on-premises (Available)

    						11.5(1) cloud (4-Feb-2016)

    						11.1(3) on-premises (5-Feb-2016)

    						11.1(3) cloud (18-Feb-2016)

    						10.6(7) on-premises (12-Feb-2016)

    						10.6(7) cloud (25-Feb-2016)

    						10.5(5) (18-Feb-2016 - Tentative)

    						9.7(7) (23-Feb-2016 - Tentative)

Cisco Jabber for Mac 		CSCux74900 	11.5(1) on-premises (3-Feb-2016)

    						11.5(1) cloud (4-Feb-2016)

Cisco Jabber for Android 	CSCux74895 	11.5(1) (Available)
    
Cisco Jabber for iPhone and	CSCux74848 1	1.5(1) (5-Feb-2016 - Tentative)
iPad
    
Server Side

Cisco Unified Communications	CSCux80122 	COP files (Available)
Manager IM & Presence Service	

At the time this advisory was first published, all available releases of the 
affected products, including Release 11.5(0), were vulnerable.

Products Confirmed Not Vulnerable

Voice and Video Telephony features of affected Jabber clients are not impacted
by this vulnerability as the operation of these functionalities does not rely
on the XMPP protocol.

    The following products are not affected by this vulnerability:

        Cisco Jabber Video for iPad

        Cisco Jabber Voice for iPhone

        Cisco Jabber Voice for Android

        Cisco UC Integration for Microsoft Lync

        Cisco Jabber Guest

        Cisco Jabber Software Development Kit

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

Workarounds

There are no workarounds that address this vulnerability.

Fixed Software

Please see the table in the Vulnerable Products section of this advisory for 
fix availability information.

On-premise deployments will also require an update of the Cisco Unified 
Communications Manager IM & Presence Service for extending protection to 
on-premise clients.

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.

Exploitation and Public Announcements

The Cisco Product Security Incident Response Team (PSIRT) is aware that 
proof-of-concept exploit code is available for the vulnerability described in
this advisory. The Cisco PSIRT is not aware of any malicious exploitation of 
this vulnerability.

Source

Cisco would like to thank Renaud Dubourguais and Sbastien Dudek from Synacktiv
for discovering and reporting this vulnerability.

URL

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151224-jab

Revision History

Version Description 			Section 			Status 	Date

2.1 	Updated information about 	Affected Products - 		Final 	2016-February-03
	the availability of fixed 	Vulnerable Products 
	releases. 

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.

- --------------------------END INCLUDED TEXT--------------------

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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