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Category:   Device (VoIP/Phone/FAX)  >   Cisco IP Phones Vendors:   Cisco
Cisco Unified IP Phone System Call Validation Flaw Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1027964
SecurityTracker URL:  http://securitytracker.com/id/1027964
CVE Reference:   CVE-2012-5445   (Links to External Site)
Date:  Jan 9 2013
Impact:   Execution of arbitrary code via local system, Modification of system information, Root access via local system
Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 7900 Series versions 9.3(1)SR1 and prior
Description:   A vulnerability was reported in Cisco Unified IP Phone. A local user can gain elevated privileges on the target system.

The system does not properly validate kernel system calls. A local user can execute arbitrary code or modify system memory on the target system with elevated privileges.

Cisco 7900 Series versions 9.3(1)SR1 and prior are affected.

The following models are affected:

Cisco Unified IP Phone 7906
Cisco Unified IP Phone 7911G
Cisco Unified IP Phone 7931G
Cisco Unified IP Phone 7941G
Cisco Unified IP Phone 7941G-GE
Cisco Unified IP Phone 7942G
Cisco Unified IP Phone 7945G
Cisco Unified IP Phone 7961G
Cisco Unified IP Phone 7961G-GE
Cisco Unified IP Phone 7962G
Cisco Unified IP Phone 7965G
Cisco Unified IP Phone 7970G
Cisco Unified IP Phone 7971G-GE
Cisco Unified IP Phone 7975G

A physically local user (via the AUX port on the back of the device) or a remote authenticated user (via SSH) can exploit this flaw. The remote access method is disabled by default once the Cisco Unified Communications Manager (CallManager) provisions the device.

Cisco has assigned Cisco bug ID CSCuc83860 to this vulnerability.

Ang Cui, Columbia University, reported this vulnerability.

Impact:   A local user can obtain elevated privileges on the target system.
Solution:   No solution was available at the time of this entry.

The vendor plans to release an Engineering Special the week of January 21, 2013 to prevent known attack vectors.

The vendor's advisory is available at:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130109-uipphone

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130109-uipphone (Links to External Site)
Cause:   Access control error, Input validation error

Message History:   None.


 Source Message Contents

Subject:  Cisco Security Advisory: Cisco Unified IP Phone Local Kernel System Call Input Validation Vulnerability

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Cisco Unified IP Phone Local Kernel System Call Input Validation
Vulnerability

Advisory ID: cisco-sa-20130109-uipphone

Revision 1.0

For Public Release 2013 January 9 16:00  UTC (GMT)
+---------------------------------------------------------------------

Summary
=======

Cisco Unified IP Phones 7900 Series versions 9.3(1)SR1 and prior
contain an arbitrary code execution vulnerability that could allow a
local attacker to execute code or modify arbitrary memory with
elevated privileges.

This vulnerability is due to a failure to properly validate input
passed to kernel system calls from applications running in userspace.
An attacker could exploit this issue by gaining local access to the
device using physical access or authenticated access using SSH and
executing an attacker-controlled binary that is designed to exploit
the issue. Such an attack would originate from an unprivileged
context.

Ang Cui initially reported the issue to the Cisco Product Security
Incident Response Team (PSIRT). On November 6, 2012, the Cisco PSIRT
disclosed this issue in Cisco bug ID CSCuc83860 (registered customers
only) Release Note Enclosure. Subsequently, Mr. Cui has spoken at
several public conferences and has performed public demonstrations of
a device being compromised and used as a listening device.

Mitigations are available to help reduce the attack surface of
affected devices. See the "Details" section of the full security
advisory linked below and the accompanying Cisco Applied Mitigation
Bulletin (AMB) for additional information.

This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130109-uipphone

Cisco Applied Mitigation Bulletin:
http://tools.cisco.com/security/center/viewAMBAlert.x?alertId=27763

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