[NT] Vulnerability in TCP/IP Could Allow Remote Code Execution (MS06-032)
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- Date: 14 Jun 2006 12:44:26 +0200
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Vulnerability in TCP/IP Could Allow Remote Code Execution (MS06-032)
------------------------------------------------------------------------
SUMMARY
Improper handling of the TCP protocol allows attackers to execute
arbitrary code in Microsoft Windows.
DETAILS
Vulnerable Systems:
* Microsoft Windows 2000 Service Pack 4
<http://www.microsoft.com/downloads/details.aspx?FamilyId=305e208c-d75c-471b-9e57-30d01e320ad1> Download the update
* Microsoft Windows XP Service Pack 1 and Microsoft Windows XP Service
Pack 2
<http://www.microsoft.com/downloads/details.aspx?FamilyId=b62abe8e-4735-4934-a66e-5b957986efbf> Download the update
* Microsoft Windows XP Professional x64 Edition
<http://www.microsoft.com/downloads/details.aspx?FamilyId=44213900-9082-45dc-b514-31d38717fe89> Download the update
* Microsoft Windows Server 2003 and Microsoft Windows Server 2003 Service
Pack 1
<http://www.microsoft.com/downloads/details.aspx?FamilyId=ea319c61-b405-41ab-9eee-d5b3488b90e0> Download the update
* Microsoft Windows Server 2003 for Itanium-based Systems and Microsoft
Windows Server 2003 with SP1 for Itanium-based Systems
<http://www.microsoft.com/downloads/details.aspx?FamilyId=cd8b88b5-f90f-4c0c-a5ad-3641751381c9> Download the update
* Microsoft Windows Server 2003 x64 Edition
<http://www.microsoft.com/downloads/details.aspx?FamilyId=cd8699bc-6760-4f0e-b8e0-2e7d89092ce8> Download the update
Immune Systems:
* Microsoft Windows 98, Microsoft Windows 98 Second Edition (SE), and
Microsoft Windows Millennium Edition (Me)
IP Source Route Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2379>
CVE-2006-2379:
There is a remote code execution vulnerability in the TCP/IP Protocol
driver that could allow an attacker who successfully exploited this
vulnerability to take complete control of the affected system.
Mitigating Factors for IP Source Route Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2379>
CVE-2006-2379:
* Firewall best practices and standard default firewall configurations
can help protect networks from attacks that originate outside the
enterprise perimeter. Best practices recommend that systems that are
connected to the Internet have a minimal number of ports exposed.
* By default, IP Source Routing is disabled on Windows XP Service Pack 2
and Windows Server 2003 Service Pack 1 systems. The default setting for
the DisableIPSourceRouting registry setting to 2.
* By default, the Routing and Remote Access Service is disabled on any
affected operating system version. Customers who manually configure the
Routing and Remote Access Service are likely to be vulnerable to this
issue.
* Attacks attempting to exploit this vulnerability would most likely
result in a denial of service condition. However remote code execution
could be possible.
Workarounds for IP Source Route Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2379>
CVE-2006-2379:
Microsoft has tested the following workarounds. Although these workarounds
will not correct the underlying vulnerability, they help block known
attack vectors. When a workaround reduces functionality, it is identified
in the following section.
* Block IP packets containing IP source route options 131 and 137 at the
firewall:
IP network packets containing IP source route options 131 and 137 could be
used to initiate a connection with the affected components. Blocking
network packets that meet these criteria at the firewall or at the router
will help protect systems that are behind that firewall or router from
attempts to exploit this vulnerability. We recommend that you block all
unsolicited inbound communication from the Internet. ISA Server 2000 and
ISA Server 2004 can be used to block the affected types of traffic.
* To help protect from network-based attempts to exploit this
vulnerability, use a personal firewall, such as the
<http://go.microsoft.com/fwlink/?LinkId=33335> Internet Connection
Firewall, which is included with Windows XP and with Windows Server 2003.
By default, the Internet Connection Firewall feature in Windows XP and in
Windows Server 2003 helps protect your Internet connection by blocking
unsolicited incoming traffic. We recommend that you block all unsolicited
incoming communication from the Internet. In Windows XP Service Pack 2
this features is called the Windows Firewall.
To enable the Internet Connection Firewall feature by using the Network
Setup Wizard, follow these steps:
1. Click Start, and then click Control Panel.
2. In the default Category View, click Network and Internet Connections,
and then click Setup or change your home or small office network. The
Internet Connection Firewall feature is enabled when you select a
configuration in the Network Setup Wizard that indicates that your system
is connected directly to the Internet.
To configure Internet Connection Firewall manually for a connection,
follow these steps:
1. Click Start, and then click Control Panel.
2. In the default Category View, click Networking and Internet
Connections, and then click Network Connections.
3. Right-click the connection on which you want to enable Internet
Connection Firewall, and then click Properties.
4. Click the Advanced tab.
5. Click to select the Protect my computer or network by limiting or
preventing access to this computer from the Internet check box, and then
click OK.
Note If you want to enable certain programs and services to communicate
through the firewall, click Settings on the Advanced tab, and then select
the programs, the protocols, and the services that are required.
* To help protect from network-based attempts to exploit this
vulnerability, block the affected ports by using IPSec on the affected
systems.
Use Internet Protocol security (IPSec) to help protect network
communications. Detailed information about IPSec and about how to apply
filters is available in <http://support.microsoft.com/kb/313190>
Microsoft Knowledge Base Article 313190 and
<http://support.microsoft.com/kb/813878> Microsoft Knowledge Base Article
813878.
* Disable IP Source Routing
Disabling IP Source Routing will prevent an affected host from processing
IP Source related packets that could allow an attacker to execute code. IP
Source Routing processing can be disabled by following these steps:
Note Using Registry Editor incorrectly can cause serious problems that may
require you to reinstall your operating system. Microsoft cannot guarantee
that problems resulting from the incorrect use of Registry Editor can be
solved. Use Registry Editor at your own risk. For information about how to
edit the registry, view the "Changing Keys And Values" Help topic in
Registry Editor (Regedit.exe) or view the "Add and Delete Information in
the Registry" and "Edit Registry Data" Help topics in Regedt32.exe.
Note We recommend backing up the registry before you edit it.
1. Click Start, click Run, type "regedit32 " (without the quotation
marks), and then click OK.
2. In Registry Editor, locate the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\
3. Add the DWORD Value: DisableIPSourceRouting. Set the value to 2. This
value disables IP Source Route processing. By default, this key does not
exist.
4. You must restart your system for this change to take effect.
FAQ for IP Source Route Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2379>
CVE-2006-2379:
What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who
successfully exploited this vulnerability could remotely take complete
control of an affected system. An attacker could then install programs;
view, change, or delete data; or create new accounts with full user
rights.
What causes the vulnerability?
An unchecked buffer in the TCP/IP Protocol driver.
What is IP Source Routing?
IP source routing is a mechanism which allows the sender to determine the
IP route that a datagram should take through the network.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could take
complete control of the affected system.
Who could exploit the vulnerability?
Any anonymous user who could deliver a specially crafted message to the
affected system could try to exploit this vulnerability.
How could an attacker exploit the vulnerability?
An attacker could try to exploit the vulnerability by creating a specially
crafted network packet and sending the packet to an affected system.
What systems are primarily at risk from the vulnerability?
Machines on which has been enabled Routing and Remote Access are primarily
at risk from this vulnerability.
Could the vulnerability be exploited over the Internet?
An attacker could try to exploit this vulnerability over the Internet.
Firewall best practices and standard default firewall configurations can
help protect against attacks that originate from the Internet. Microsoft
has provided information about how you can help
<http://go.microsoft.com/fwlink/?LinkId=21169> protect your PC. End users
can visit the Protect Your PC Web site. IT professionals can visit the
<http://go.microsoft.com/fwlink/?LinkId=21171> Security Guidance Center
Web site.
What does the update do?
The update removes the vulnerability by modifying the way that TCP/IP
Protocol driver validates the length of a message before it passes the
message to the allocated buffer.
When this security bulletin was issued, had this vulnerability been
publicly disclosed?
No. Microsoft received information about this vulnerability through
responsible disclosure.
When this security bulletin was issued, had Microsoft received any reports
that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this
vulnerability had been publicly used to attack customers and had not seen
any examples of proof of concept code published when this security
bulletin was originally issued.
ADDITIONAL INFORMATION
The information has been provided by Microsoft Security.
The original article can be found at:
<http://www.microsoft.com/technet/security/Bulletin/MS06-032.mspx>
http://www.microsoft.com/technet/security/Bulletin/MS06-032.mspx
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