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Vulnerability Alert

Cisco Unified IP Phone 8900/9900 Series Insecure File Permissions Vulnerability

 
Threat Type:CWE-264: Permissions, Privileges, and Access Control
IntelliShield ID:31741
Version:1
First Published:2013 November 13 15:20 GMT
Last Published:2013 November 13 15:20 GMT
Port: Not available
CVE:CVE-2013-6685
BugTraq ID:63687
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:6.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.6
Related Resources:
View related Security Notice
 
 
Version Summary:Cisco Unified IP Phone 8900 and 9900 Series contain a vulnerability that could allow a local attacker to completely compromise an affected device. Updates are available.
 
 
Description
A vulnerability in Cisco Unified IP Phone 9951, Cisco Unified IP Phone 9971, and Cisco Unified IP Phone 8961 could allow an authenticated, local attacker to fully compromise the affected device.

The vulnerability is due to insecure file permissions on memory block devices. An attacker could exploit this vulnerability by mounting a malicious filesystem that contains an attacker-controlled SUID binary. An exploit could allow the attacker to take complete control of the affected device.

Cisco would like to thank Red Balloon Security for reporting this vulnerability.

Cisco has confirmed the vulnerability in a security notice and released software updates.
 
Warning Indicators
At the time this alert was first published, Cisco Unified IP Phone 9900 Series Firmware versions 9.4.1 and prior were vulnerable. Later releases of Cisco Unified IP Phone 9900 Series Firmware may also be vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker must have local access to the targeted device. This access requirement decreases the likelihood of a successful exploit.

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 a security notice at the following link: CVE-2013-6685

Customers are advised to consult Cisco bug ID CSCui04382 for a complete list of affected product versions.
 
Impact
A local attacker could exploit this vulnerability to take complete control of an affected device, which could be used to conduct further attacks.
 
Technical Information
The vulnerability is due to insecure file permissions on memory block devices.

A local attacker could exploit this vulnerability by mounting a malicious filesystem that contains an attacker-controlled SUID binary. An exploit could allow the attacker to take complete control of the affected device, which could be used to conduct further attacks.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to access local systems.

Administrators are advised to monitor affected systems.
 
Patches/Software
Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com for assistance.
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
CiscoCisco Unified IP Phones 9900 Series Firmware 9.0 Base, .1, .1 SR1, .2, .3, .4 | 9.1 Base, .1 SR1, .2 | 9.2 Base, .1, .2, .2 SR1, .3, .4 | 9.3 Base, .1, .2, .2 SR1, .4 | 9.4 .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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