Home Page | Skip to Navigation | Skip to Content | Skip to Search | Skip to Footer

Update Protection against Multiple Vendor SNMPv3 HMAC Handling Authentication Bypass Vulnerability

Check Point Reference: CPAI-2008-088
Date Published:
Severity:
Last Updated:
Source: Secunia Advisory: SA30574
Industry Reference(s): CVE-2008-0960
Protection Provided by: VPN-1
  • NGX R65
  • NGX R62
  • NGX R61
  • NGX R60
  • NG with Application Intelligence R55
VSX
  • NGX
  • NGX R65
InterSpect
  • NGX
Connectra
  • NGX R62
  • NGX R61
IPS-1
  • IPS-1
  • IPS-1 NGX R65
Who is Vulnerable?
Net-SNMP Project Net-SNMP 5.4.x prior to 5.4.1.1
Net-SNMP Project Net-SNMP 5.3.x prior to 5.3.2.1
Net-SNMP Project Net-SNMP 5.2.x prior to 5.2.4.1
Net-SNMP Project UCD-SNMP 4.x prior to 4.2.7.1
Vulnerability Description
An authentication bypass vulnerability was reported in multiple implementations of the SNMPv3 protocol. Simple Network Management Protocol (SNMP) is an application layer protocol that is part of the Transmission Control Protocol/Internet Protocol (TCP/IP) protocol suite. SNMP allows administrators to remotely manage network devices made by many different vendors, including servers, workstations, routers, firewalls, and so forth. The SNMP Service allows the local computer to service incoming SNMP requests. SNMP version 3 is the standard version of SNMP since 2004. A remote attacker may exploit the authentication bypass vulnerability to gain unauthorized access to a target system.
Update/Patch Available
Update to version 5.4.1.1, 5.3.2.1, or 5.2.4.1.
Vulnerability Details
The vulnerability is due to a failure to properly handle HMAC in an authentication message. A remote attacker can exploit this issue by sending a specially crafted SNMPv3 authentication request to a vulnerable system. Successful exploitation may allow the attacker to gain access to a target system.

Protection Overview
By enabling this protection, SmartDefense will detect and block malformed SNMPv3 messages.

In order for the protection to be activated, update your VPN-1/InterSpect/Connectra product to the latest SmartDefense update. For information on how to update SmartDefense, go to SBP-2006-05, Protection tab and select the version of your choice.

To configure the defense, select your product from the list below and follow the related protection steps.

VPN-1 NGX R65 & R62

How Can I Protect My Network?
1. In the SmartDefense tab, click Application Intelligence > SNMP Protocol Inspection > Block Multiple Vendor SNMPv3 HMAC Handling Authentication Bypass.
2. In the configuration pane, under Settings > Mode, check Active.
3. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:

Attack Name: SNMP Protection Violation
Attack Information: SNMPv3 HMAC handling authentication bypass

VPN-1 NGX R61 & R60

How Can I Protect My Network?
1. In the Smartdefense tree, click Application Intelligence > SNMP Protocol Inspection.
2. Enable the following protection:

Block Multiple Vendor SNMPv3 HMAC Handling Authentication Bypass

3. Install security policy.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:

Attack Name: SNMP Protection Violation
Attack Information: SNMPv3 HMAC handling authentication bypass

VPN-1 NG with Application Intelligence R55

How Can I Protect My Network?
1. In the Smartdefense tree, click Application Intelligence > SNMP Protocol Inspection.
2. Enable the following protection:

Block Multiple Vendor SNMPv3 HMAC Handling Authentication Bypass

3. Install security policy.

How Do I Know if My Network is Under Attack?
Rule #100001 will appear on the SmartView Tracker.

VPN-1 VSX NGX R65

How Can I Protect My Network?
1. In the SmartDefense tab, click Application Intelligence > SNMP Protocol Inspection > Block Multiple Vendor SNMPv3 HMAC Handling Authentication Bypass.
2. In the configuration pane, under Settings > Mode, check Active.
3. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:

Attack Name: SNMP Protection Violation
Attack Information: SNMPv3 HMAC handling authentication bypass

VPN-1 VSX NGX

How Can I Protect My Network?
1. In the Smartdefense tree, click Application Intelligence > SNMP Protocol Inspection.
2. Enable the following protection:

Block Multiple Vendor SNMPv3 HMAC Handling Authentication Bypass

3. Install security policy.

How Do I Know if My Network is Under Attack?
Rule #100001 will appear on the SmartView Tracker.

InterSpect NGX

How Can I Protect My Network?
1. In the lefthand menu, click Profiles > Default Protection > SmartDefense. The SmartDefense page opens.
2. In the SmartDefense tree, click Application Intelligence > SNMP Protocol Inspection.
3. Enable the following protection:

Block Multiple Vendor SNMPv3 HMAC Handling Authentication Bypass

4. Install security policy.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:

Attack Name: SNMP Protection Violation
Attack Information: SNMPv3 HMAC handling authentication bypass

Connectra NGX R62 & R61

How Can I Protect My Network?
1. In the left-hand menu, click Security > SmartDefense > Application Intelligence.
2. In the Dynamic Attacks pane, select the following:

Block Multiple Vendor SNMPv3 HMAC Handling Authentication Bypass

3. Install policy on all modules.

How Do I Know if My Network is Under Attack?
Upon attack, the following entries will be logged:

Attack Name: SNMP Protection Violation
Attack Information: SNMPv3 HMAC handling authentication bypass

IPS-1 & IPS-1 NGX R65

How Can I Protect My Network?
1. In the IPS-1 Policy Manager, click on the Protection tab.
2. In the Protection tree, click Network Security > SNMP, and select the SNMP Attacks protection group.
3. Click CVE-2008-0960-SNMPv3 Short HMAC Authentication Bypass (IPS-1 NGX R65 only).
4. In the configuration pane, under Settings, check Active.
5. Click on Install Policy.

How Do I Know if My Network is Under Attack?
Upon attack, the following entry will be logged:

Alert Name: snmp_attacks
Description: short_hmac_alert