Cisco Security Advisory - 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.
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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)
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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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