Cisco Security Advisory
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AV:N/AC:M/Au:S/C:N/I:N/A:C/E:F/RL:OF/RC:C
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Cisco IOS Software contains a vulnerability that could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.
The vulnerability is due to an error in the SSL VPN component of the affected software. An authenticated, remote attacker could exploit this vulnerability by sending a series of malicious packets via an SSL VPN session that terminates over a PPP over ATM (PPPoA) interface of a targeted device. Successful exploitation could allow the attacker to cause the affected device to crash, resulting in a DOS condition.
Cisco has confirmed the vulnerability and released software updates.
A successful exploit could allow an attacker to cause a device to stop responding, which could prevent authorized users from accessing network resources served by the targeted device.
This alert contains CVSS scoring supplied by Cisco, the primary vendor of the affected product. 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 a release note enclosure for Cisco bug IDs CSCte41827 and CSCty97961 at the following link: Cross-Platform Release Notes for Cisco IOS Release 15.2M&T
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Administrators are advised to apply the appropriate updates.
Administrators may consider removing the outbound ACL configurations.
Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.
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 e-mail 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 2012-Oct-03
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