Executive Summary

Title Microsoft Windows Vista Teredo IPv6 interface firewall bypass vulnerability
Name VU#101321 First vendor Publication 2007-07-10
Vendor VU-CERT Last vendor Modification 2007-07-11
Severity (Vendor) N/A Revision M

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
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Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:C/I:N/A:N)
Cvss Base Score 7.8 Attack Range Network
Cvss Impact Score 6.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
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Vulnerability Note VU#101321

Microsoft Windows Vista Teredo IPv6 interface firewall bypass vulnerability


A vulnerability in the Microsoft Windows Vista firewall may allow an attacker to send unfiltered IPv6 traffic to a vulnerable system.

I. Description

Internet Protocol version 6 (IPv6) is an IP standard that is designed to replace the Internet Protocol version 4 (IPv4). The Microsoft Teredo service is used by Microsoft Windows Vista, XP, and Server 2003 to allow clients with only IPv4 connectivity to obtain and use publicly routable IPv6 addresses.

The Teredo service must be manually enabled by an administrator in Windows XP and Server 2003. The Teredo service is enabled by default in Windows Vista, but is not activated until an application requests an IPv6 address.

The Windows firewall does not properly apply stateful packet inspection rules to incoming Teredo traffic.

Note that the Teredo service may create a tunnel through perimeter firewalls, bypassing access control lists and content inspection filtering. See RFC 4380 section 7.1 for more details.

II. Impact

A remote, unautheticated attacker may be able to send unsolicited and unfiltered IPv6 traffic to a vulnerable system.

III. Solution


Microsoft has released an update to address this issue. Users are encourgaed to review Microsoft Security Bulletin MS07-038 and take appropriate action.

Disable Teredo

Disabling the Teredo service will mitigate this vulnerability. See Microsoft Security Bulletin MS07-038 for information on how to disable Teredo.

Systems Affected

VendorStatusDate Updated
Microsoft CorporationVulnerable10-Jul-2007




Thanks to Symantec and Microsoft for information that was used in this report.

This document was written by Ryan Giobbi.

Other Information

Date Public07/10/2007
Date First Published07/10/2007 08:44:33 PM
Date Last Updated07/11/2007
CERT Advisory 
CVE NameCVE-2007-3038
Document Revision13

Original Source

Url : http://www.kb.cert.org/vuls/id/101321

OVAL Definitions

Definition Id: oval:org.mitre.oval:def:1884
Oval ID: oval:org.mitre.oval:def:1884
Title: Windows Vista Firewall Blocking Rule Information Disclosure Vulnerability
Description: The Teredo interface in Microsoft Windows Vista and Vista x64 Edition does not properly handle certain network traffic, which allows remote attackers to bypass firewall blocking rules and obtain sensitive information via crafted IPv6 traffic, aka "Windows Vista Firewall Blocking Rule Information Disclosure Vulnerability."
Family: windows Class: vulnerability
Reference(s): CVE-2007-3038
Version: 1
Platform(s): Microsoft Windows Vista
Definition Synopsis:

CPE : Common Platform Enumeration

Os 2

OpenVAS Exploits

Date Description
2011-01-14 Name : Microsoft Windows Vista Teredo Interface Firewall Bypass Vulnerability
File : nvt/gb_ms07-038.nasl

Open Source Vulnerability Database (OSVDB)

Id Description
35952 Microsoft Windows Vista Teredo Crafted IPv6 Traffic Blocking Rule Bypass

Snort® IPS/IDS

Date Description
2014-01-10 Inbound Teredo traffic detected
RuleID : 12068 - Revision : 6 - Type : POLICY-OTHER
2014-01-10 Outbound Teredo traffic detected
RuleID : 12067 - Revision : 6 - Type : POLICY-OTHER
2014-01-10 Inbound Teredo traffic detected
RuleID : 12066 - Revision : 7 - Type : POLICY-OTHER
2014-01-10 Outbound Teredo traffic detected
RuleID : 12065 - Revision : 6 - Type : POLICY-OTHER

Nessus® Vulnerability Scanner

Date Description
2007-07-10 Name : The remote Windows Vista system contains a firewall that is affected by an in...
File : smb_nt_ms07-038.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2015-05-08 13:27:58
  • Multiple Updates