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.
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.
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.
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.
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.
A local attacker could exploit this vulnerability to take complete control of an affected device, which could be used to conduct further attacks.
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.
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.
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 email@example.com for assistance.
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