Cisco Security Advisory
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AV:L/AC:L/Au:S/C:C/I:C/A:C/E:F/RL:OF/RC:C
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A vulnerability in the boot process of the Cisco ASR5000 and ASR5500 (ASK5K) System Software could allow an authenticated, local attacker to cause commands to be executed during the boot process.
The vulnerability is due to improper reading of a local file on Compact Flash (CF) during the boot process. An attacker could exploit this vulnerability by logging in as an administrator-privileged user and writing a file to CF with a set of Linux commands. An exploit could allow the attacker to execute this list of unexpected Linux commands at boot time. The commands are contained in the file that was written out by the malicious administrative user.
Cisco has confirmed the vulnerability and released software updates.
To exploit the vulnerability, an attacker must be able to log in locally to a device and have permissions sufficient to write to the device storage. These access requirements greatly reduce the potential for exploitation.
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Cisco has released bug ID CSCuu75278 for registered users, which contains additional details and an up-to-date list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco ASR 5000 Series Software release 14.0 was vulnerable. Later releases of Cisco ASR 5000 Series Software may also be vulnerable.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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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.
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Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com.
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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.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2015-Jul-09
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