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ESB-2016.0653 - [Cisco] Cisco Cable Modem : Execute arbitrary code/commands - Remote/unauthenticated

Date: 10 March 2016

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0653
 Cisco Cable Modem with Digital Voice Remote Code Execution Vulnerability
                               10 March 2016

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

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

Product:           Cisco Cable Modem
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-1327  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160309-cmre

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

Cisco Security Advisory

Cisco Cable Modem with Digital Voice Remote Code Execution Vulnerability

High

Advisory ID: cisco-sa-20160309-cmre

Published: 2016 March 9 16:00 GMT

Version 1.0: Final

CVSS Score:

Base - 10.0

Workarounds:

No workarounds available

Cisco Bug IDs:

CSCuv05935

CVE-2016-1327

CWE-20

Summary

A vulnerability in the web server used in the Cisco Cable Modem with Digital 
Voice Model DPC2203 could allow an unauthenticated, remote attacker to exploit
a buffer overflow and cause arbitrary code execution.

The vulnerability is due to improper input validation for HTTP requests. An 
attacker could exploit this vulnerability by sending a crafted HTTP request to
the affected device.

Cisco has released software updates to its service provider customers that 
address the vulnerability described in this advisory. Prior to contacting 
Cisco TAC, customers are advised to contact their service providers to confirm
the software deployed by the service provider includes the fix that addresses
this vulnerability. Workarounds that mitigate this vulnerability are not 
available.

This advisory is available at the following link: 
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160309-cmre

Affected Products

Vulnerable Products

The following Cisco product are vulnerable:

Cisco Cable Modem with Digital Voice Model DPC2203

Cisco Cable Modem with Digital Voice Model EPC2203

Products Confirmed Not Vulnerable

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

 Workarounds

There are no workarounds that address this vulnerability.

Fixed Software

Cisco has released software updates to its service provider customers that 
address the vulnerability described in this advisory. Prior to contacting 
Cisco TAC, customers are advised to contact their service providers to confirm
the software deployed by the service provider includes the fix that addresses
this vulnerability.

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.

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

Cisco would like to thank Chris Watts of Tech Analysis for reporting this 
vulnerability.

URL

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160309-cmre

Revision History

Version Description Section Status Date

1.0 Initial public release. Final 2016-March-09

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
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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