Two vulnerabilities have been reported in various Cisco products, which can be exploited by malicious people to spoof authenticated SNMPv3 packets.

The vulnerabilities are caused due to errors in the authentication code of multiple SNMPv3 implementations and can be exploited via specially crafted SNMPv3 packets using HMAC-MD5-96 or HMAC-SHA-96 as authentication protocol.

Successful exploitation allows to disclose certain network information or make configuration changes on a vulnerable device, but requires that the SNMP server is enabled (disabled by default).

This is related to:
SA30574

The vulnerabilities are reported in the following products:
* Cisco IOS
* Cisco IOS-XR
* Cisco Catalyst Operating System (CatOS)
* Cisco NX-OS
* Cisco Application Control Engine (ACE) Module
* Cisco ACE Appliance
* Cisco ACE XML Gateway
* Cisco MDS 9000 Series Multilayer Fabric Switches
* Cisco Wireless LAN Controller (WLC)
* Cisco Application and Content Networking System (ACNS)
* Cisco Wide Area Application Services (WAAS)
* Cisco MGX 8830, 8850, and 8880 Media Gateway and Switch
* Cisco Internet Streamer CDS

Solution
Update to fixed versions (please see vendor advisory for details).

Provided and/or discovered by
The vendor credits Dr. Tom Dunigan of the University of Tennessee and Net-SNMP.

Changelog
Further details available to Secunia VIM customers

Original Advisory
Cisco:
http://www.cisco.com/warp/public/707/cisco-sa-20080610-snmpv3.shtml

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers