Cisco Security Advisory
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AV:L/AC:M/Au:S/C:C/I:C/A:C/E:F/RL:OF/RC:C
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A vulnerability in the Tool Command Language (TCL) script interpreter of Cisco IOS Software could allow an authenticated, local attacker to escalate privileges from those of a non-privileged user to a privileged (level 15) user. This would allow a non-privileged user to execute privileged commands (those under privilege level 15).
The vulnerability is due to an error when resetting vty privileges after running a TCL script. An attacker could exploit this vulnerability by establishing a session with an affected device immediately after a TCL script has been run. An attacker would need to provide valid credentials and successfully pass authentication to the device.
Cisco has confirmed the vulnerability and released software updates.
To exploit this vulnerability, an attacker must authenticate and have local access to the targeted device. These access requirements could reduce 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.
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Cisco has released bug ID CSCuq24202 for registered users, which contains additional details and an up-to-date list of affected product versions.
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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 allow only privileged users to access administration or management 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-Jun-12
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