Cisco Security Advisory
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AV:N/AC:H/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
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A vulnerability in MLDP processing of Cisco IOS Software on Cisco 7600 Series routers could allow an unauthenticated, remote attacker to cause a reload of the affected device, which could lead to a denial of service (DoS) condition.
The vulnerability is due to chunk corruption when MLDP and a large number of VRFs are configured on a device. An attacker could exploit this vulnerability by sending a large number of multicast flows over a number of configured VRF instances. An exploit could allow the attacker to cause a reload of the affected device and lead to a DoS condition.
Cisco has confirmed the vulnerability in a security notice and released software updates.
To exploit this vulnerability, an attacker need to have the ability to send a large number of multicast flows over a number of configured VRF instances to the targeted device. To achieve this, it is likely that an attacker would need access to trusted, internal networks in which the targeted device may reside. This access requirement could limit the possibility 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 ID CSCue22345 for the most complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco IOS Software versions 15.3(3)S 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 may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected 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-21
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