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ESB-2016.0363 - [Cisco] Cisco Universal Small Cell Devices: Access privileged data - Remote/unauthenticated

Date: 15 February 2016

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

                               ESB-2016.0363
         Cisco Universal Small Cell Devices Unauthorized Firmware
                          Retrieval Vulnerability
                             15 February 2016

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

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

Product:           Cisco Universal Small Cell Devices
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Access Privileged Data -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2016-1321  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160212-usc

Comment: AusCERT recommends administrators limit external network access to the
         device.

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

Cisco Universal Small Cell Devices Unauthorized Firmware Retrieval 
Vulnerability

Medium

Advisory ID:

cisco-sa-20160212-usc

Published:

2016 February 12 20:50 GMT

Version 1.0:

Final

CVSS Score:

Base - 5.0

Workarounds:

No workarounds available

Cisco Bug IDs:

CSCut98082

CVE-2016-1321

CWE-200

Summary

A vulnerability in Cisco Universal Small Cell devices could allow an 
unauthenticated, remote attacker to retrieve firmware from a Cisco-hosted 
binary server.

The vulnerability is due to insufficient enforcement of the two-way 
certificate validation process by the Cisco-hosted binary server to ensure 
that only Cisco Universal Small Cell devices are able to download the firmware
images and service provider configuration hints file.

The hints file contains IP addresses of the device's provisioned service 
provider Cisco Universal Small Cell RAN Management System. The binary images 
retrieved from the image distribution service could be decrypted by an 
attacker who has previously retrieved a valid key from the flash of a Cisco 
Universal Small Cell device.

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-20160212-usc

Affected Products

Vulnerable Products

Cisco Universal Small Cell devices are vulnerable.

Products Confirmed Not Vulnerable

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

Workarounds

Workarounds are not available.

Fixed Software

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.

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.

URL

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160212-usc

Revision History

Version Description Section Status Date

1.0 Initial public release NA Final 2016-02-12

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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This security bulletin is provided as a service to AusCERT's members.  As
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NOTE: This is only the original release of the security bulletin.  It may
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        http://www.auscert.org.au/render.html?cid=1980

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

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
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