Multiple Vendor HMAC Authentication SNMPv3 Authentication Bypass
critical Nessus Plugin ID 40449
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VPR Score: 7.4
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.
Solution
This vulnerability affects multiple products from multiple vendors. Check with your vendor for the appropriate solution.See Also
Plugin Details
Severity: Critical
ID: 40449
File Name: snmpv3_authentication_bypass.nasl
Version: 1.22
Type: remote
Family: SNMP
Published: 7/31/2009
Updated: 7/30/2018
Dependencies: 11153
Risk Information
Risk Factor: Critical
VPR Score: 7.4
CVSS v2.0
Base Score: 10
Temporal Score: 8.3
Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C
Temporal Vector: E:F/RL:OF/RC:C
CVSS v3.0
Base Score: 9.8
Temporal Score: 9.1
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: E:F/RL:O/RC:C
Vulnerability Information
Required KB Items: SNMP/v3/username, SNMP/v3/Supported
Exploit Available: true
Exploit Ease: Exploits are available
Exploited by Nessus: true
Patch Publication Date: 6/9/2008
Vulnerability Publication Date: 5/31/2008
Exploitable With
CANVAS (D2ExploitPack)
Reference Information
CVE: CVE-2008-0960
BID: 29623