Multiple Vendor HMAC Authentication SNMPv3 Authentication Bypass

This script is Copyright (C) 2009-2013 Tenable Network Security, Inc.


Synopsis :

The SNMP server running on this host is affected by an authentication
bypass vulnerability.

Description :

SNMPv3 HMAC verification relies on the client to specify the HMAC
length. This makes it possible for remote attackers to bypass SNMP
authentication via repeated attempts with a HMAC length value of 1,
which causes only the first byte of the authentication hash to be
checked.

This issue affects SNMP implementations from multiple vendors.

See also :

http://sourceforge.net/forum/forum.php?forum_id=833770

Solution :

This vulnerability affects multiple products from multiple vendors.
Check with your vendor for the appropriate solution.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 8.3
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true

Family: SNMP

Nessus Plugin ID: 40449 ()

Bugtraq ID: 29623

CVE ID: CVE-2008-0960