Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
The vulnerability is due to errors in the Smart Install feature.?An unauthenticated, remote attacker could exploit this vulnerability to cause the targeted device to reset, resulting in a DoS condition.
Cisco confirmed the vulnerability in a security advisory and released updated software.
Cisco has published a list of affected Cisco IOS Software releases in the security advisory.? The Vendor Announcements section of this alert contains a link to the advisory.
To exploit this vulnerability, the attacker would need the ability to submit?Smart Install?packets to the targeted system. To achieve this objective, the attacker may need access to trusted, internal network resources.? This access requirement reduces the exposure of this vulnerability.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
An unauthenticated, remote attacker could exploit this vulnerability to cause a targeted device to reset. Sustained attacks could result in a DoS condition.
The vulnerability is in the Smart Install feature of Cisco Catalyst Switches that use Cisco IOS Software.
An unauthenticated, remote attacker could exploit this vulnerability by submitting crafted Smart Install messages to the targeted device via a TCP session to port 4786. When processed, the malicious packets could cause the device to reset. Sustained attacks could result in a DoS condition.
Administrators are advised to apply the appropriate updates.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators are advised to allow only trusted users to have network access.
Administrators may consider disabling the Smart Install feature.
Administrators are advised to monitor affected systems.
The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: cisco-amb-20120328-smartinstall
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 e-mail at firstname.lastname@example.org.
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.