ESB-2017.2250 - [Cisco] Cisco Yes Set-Top Box: Denial of service - Remote/unauthenticated 2017-09-07

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2250
           Cisco Yes Set-Top Box Denial of Service vulnerability
                             7 September 2017

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

Product:           Cisco Yes Set-Top Box
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-6631  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-stb

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Cisco Yes Set-Top Box Denial of Service vulnerability

Medium

Advisory ID: cisco-sa-20170906-stb

First Published: 2017 September 6 16:00 GMT

Version 1.0: Final

Workarounds: No workarounds available

Cisco Bug IDs:

CSCvd08812

CVSS Score:

Base 7.5

Base 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X

CVE-2017-6631

CWE-399

Summary

A vulnerability in the HTTP remote procedure call (RPC) service of set-top box
(STB) receivers manufactured by Cisco for Yes could allow an unauthenticated,
remote attacker to cause a denial of service (DoS) condition on an affected 
device.

The vulnerability exists because the firmware of an affected device fails to 
handle certain XML values that are passed to the HTTP RPC service listening on
the local subnet of the device. An attacker could exploit this vulnerability 
by submitting a malformed request to an affected device. A successful attack 
could cause the affected device to restart, resulting in a DoS condition.

Yes has updated the affected devices with firmware that addresses this 
vulnerability. Customers are not required to take action.

There are no workarounds that address this vulnerability.

This advisory is available at the following link:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-stb

Affected Products

Vulnerable Products

This vulnerability affects YesMaxTotal, YesMax HD, and YesQuattro STB devices.
For information about affected releases, consult the Cisco bug ID(s) at the 
top of this advisory.

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

For information about fixed releases, consult the Cisco bug ID(s) at the top 
of this advisory.

When considering software upgrades, customers are advised to regularly consult
the advisories for Cisco products, which are available from the Cisco Security
Advisories and Alerts page, 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.

Source

This vulnerability was reported to Cisco by Yaron Klein.

URL

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-stb

Revision History

Version 	Description 		Section Status 	Date

1.0 		Initial public release. -	Final 	2017-September-06

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.

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