Cisco IOS Software contains a vulnerability in the IP version 6 (IPv6) protocol stack implementation that could allow an unauthenticated, remote attacker to cause a reload of an affected device that has IPv6 enabled. The vulnerability may be triggered when the device processes a malformed IPv6 packet.
Cisco has released free software updates that address this vulnerability. There are no workarounds to mitigate this vulnerability.
Note:- The September 28, 2011, Cisco IOS Software Security Advisory bundled publication includes ten Cisco Security Advisories. Nine of the advisories address vulnerabilities in Cisco IOS Software, and one advisory addresses a vulnerability in Cisco Unified Communications Manager. Each advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all vulnerabilities in the September 2011 Bundled Publication.
Affected Products:-
Cisco devices that are running an affected version of Cisco IOS Software and configured for IPv6 operation are vulnerable. A device that is running Cisco IOS Software and that has IPv6 enabled will show some interfaces with assigned IPv6 addresses when the show ipv6 interface brief command is executed.
The show ipv6 interface brief command will produce an error message if the version of Cisco IOS Software in use does not support IPv6, or will not show any interfaces with IPv6 address if IPv6 is disabled. The system is not vulnerable in these scenarios.
Sample output of the show ipv6 interface brief command on a system that is configured for IPv6 operation follows:-
router>show ipv6 interface brief
FastEthernet0/0 [up/up]
FE80::222:90FF:FEB0:1098
2001:DB8:2:93::3
200A:1::1
FastEthernet0/1 [up/up]
FE80::222:90FF:FEB0:1099
2001:DB8:2:94::1
Serial0/0/0 [down/down]
unassigned
Serial0/0/0.4 [down/down]
unassigned
Serial0/0/0.5 [down/down]
unassigned
Serial0/0/0.6 [down/down]
unassignedAlternatively, the IPv6 protocol is enabled if the interface configuration command ipv6 address <IPv6 address> or ipv6 enable is present in the configuration. Both may be present, as shown in the vulnerable configuration in the following example shows:-
interface FastEthernet0/1 ipv6 address 2001:0DB8:C18:1::/64 eui-64 ! interface FastEthernet0/2 ipv6 enable
A device that is running Cisco IOS Software and that has IPv6 enabled on a physical or logical interface is vulnerable even if ipv6 unicast-routing is globally disabled (that is, the device is not routing IPv6 packets).
To determine the Cisco IOS Software release that is running on a Cisco product, administrators can log in to the device and issue the show version command to display the system banner. The system banner confirms that the device is running Cisco IOS Software by displaying text similar to "Cisco Internetwork Operating System Software" or "Cisco IOS Software." The image name displays in parentheses, followed by "Version" and the Cisco IOS Software release name. Other Cisco devices do not have the show version command or may provide different output.
The following example identifies a Cisco product that is running Cisco IOS Software Release 15.0(1)M1 with an installed image name of C3900-UNIVERSALK9-M:
Router> show version Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2009 by Cisco Systems, Inc. Compiled Wed 02-Dec-09 17:17 by prod_rel_team !--- output truncated
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