Cisco Security Advisory
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AV:N/AC:L/Au:S/C:N/I:N/A:C/E:F/RL:OF/RC:C
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A vulnerability in the Datagram Transport Layer Security (DTLS) function of the Cisco IOS Software SSL VPN feature could allow an authenticated, remote attacker to cause the SSL VPN gateway interface to stop processing traffic when the queue is full, resulting in a denial of service (DoS) condition.
The vulnerability is due to improper processing of specific DTLS packets. An attacker could exploit this vulnerability by creating an SSL session and then sending crafted DTLS packets. An exploit could allow the attacker to cause the SSL VPN gateway interface to become full, resulting in a DoS condition.
Cisco has confirmed the vulnerability in a security notice and released software updates.
To exploit this vulnerability, an attacker would need to authenticate to the targeted device to send specific DTLS packets to the vulnerable system. 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.
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Customers are advised to consult Cisco bug IDs CSCuh97409 and CSCud90568 for a complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco IOS Software Releases 15.3(1)T2 and prior were vulnerable. Later releases of Cisco IOS 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 have network access.
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 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 tac@cisco.com for assistance.
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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 2013-Nov-13
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