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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.1665
     Cisco Unified Presence Server Cross-Site Scripting Vulnerability
                               26 June 2015

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

Product:           Cisco Unified Presence Server
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-4220  

Original Bulletin: 
   http://tools.cisco.com/security/center/viewAlert.x?alertId=39504

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Vulnerability Alert

Cisco Unified Presence Server Cross-Site Scripting Vulnerability

Threat Type: CWE-79: Cross-Site Scripting (XSS)

IntelliShield ID: 39504

Version: 1

First Published: 2015 June 24 22:06 GMT

Last Published: 2015 June 24 22:06 GMT

Port: Not available

CVE: CVE-2015-4220

Urgency: Unlikely Use

Credibility: Confirmed

Severity: Mild Damage

CVSS Base: 4.3

CVSS Version 2.0

CVSS Temporal: 3.6

Version Summary: Cisco Unified Presence Server contains a vulnerability that 
could allow an unauthenticated, remote attacker to conduct cross-site 
scripting attacks. Updates are available.

Description

A vulnerability in the Cisco Unified Presence Server could allow an 
unauthenticated, remote attacker to conduct a cross-site scripting (XSS) 
attack against a user of the web interface of the affected system.

The vulnerability is due to insufficient input validation of a user-supplied 
value. An attacker could exploit this vulnerability by convincing a user to 
click a specific link. A successful exploit could allow the attacker to 
execute arbitrary script or HTML code in the user's session, which could be 
used to access sensitive browser-based information.

Cisco has confirmed the vulnerability and released software updates.

Warning Indicators

At the time this alert was first published, Cisco Unified Presence Server 
version 9.1(1) was vulnerable. Later releases of Cisco Unified Presence Server
may also be vulnerable.

IntelliShield Analysis

To exploit the vulnerability, the attacker may provide a link that directs a 
user to a malicious site and use misleading language or instructions to 
persuade the user to follow the provided link.

Cisco indicates through the CVSS score that functional exploit code exists; 
however, the code is not known to be publicly available.

Vendor Announcements

Cisco has released bug ID CSCuq03773 for registered users, which contains 
additional details and an up-to-date list of affected product versions.

Impact

An unauthenticated, remote attacker could exploit the vulnerability to execute
arbitrary script or HTML code in the user's session, which could be used to 
access sensitive browser-based information. The attacker could use this 
information to conduct further attacks.

Technical Information

The vulnerability is due to insufficient validation of user-supplied input 
processed by a device running the affected software.

An unauthenticated, remote attacker could exploit this vulnerability by 
convincing a user to click a specific link. A successful exploit could allow 
the attacker to execute arbitrary script or HTML in the user's session, which
could be used to access sensitive browser-based information.

Safeguards

Administrators are advised to apply the appropriate updates.

Users should verify that unsolicited links are safe to follow.

For additional information about XSS attacks and the methods used to exploit 
these vulnerabilities, see the Cisco Applied Mitigation Bulletin Understanding
Cross-Site Scripting (XSS) Threat Vectors.

Administrators are advised to monitor affected systems.

Patches/Software

Cisco customers with active contracts can obtain updates through the Software
Center at the following link: Cisco. Cisco customers without contracts can 
obtain upgrades by contacting the Cisco Technical Assistance Center at 
1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com.

Alert History

Initial Release

Product Sets

The security vulnerability applies to the following combinations of products.

Primary Products:

Cisco Cisco Unified Presence Server 9.1 (1)

Associated Products:

N/A

Alerts and bulletins on the Cisco Security Intelligence Operations Portal are
highlighted by analysts in the Cisco Threat Operations Center and represent a
subset of the comprehensive content that is available through Cisco Security 
IntelliShield Alert Manager Service. This customizable threat and 
vulnerability alert service provides security staff with access to timely, 
accurate, and credible information about threats and vulnerabilities that may
affect their environment.

LEGAL DISCLAIMER

The urgency and severity ratings of this alert are not tailored to individual
users; users may value alerts differently based upon their network 
configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED 
THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF 
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED 
THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION
IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE
TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES 
THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.

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