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Vulnerability in Plug and Play Allows Remote Code Execution and Elevation
of Privilege (MS05-039)
------------------------------------------------------------------------
SUMMARY
A remote code execution vulnerability exists in Plug and Play (PnP) that
allows an attacker who successfully exploited this vulnerability to take
complete control of the affected system.
DETAILS
Vulnerable Systems:
* Microsoft Windows 2000 Service Pack 4
<http://www.microsoft.com/downloads/details.aspx?FamilyId=E39A3D96-1C37-47D2-82EF-0AC89905C88F>
Download the update
* Microsoft Windows XP Service Pack 1 and Microsoft Windows XP Service
Pack 2
<http://www.microsoft.com/downloads/details.aspx?FamilyId=9A3BFBDD-62EA-4DB2-88D2-415E095E207F>
Download the update
* Microsoft Windows XP Professional x64 Edition
<http://www.microsoft.com/downloads/details.aspx?FamilyId=89D90E25-4773-4782-AD06-9B7517BAB3C8>
Download the update
* Microsoft Windows Server 2003 and Microsoft Windows Server 2003 Service
Pack 1
<http://www.microsoft.com/downloads/details.aspx?FamilyId=6275D7B7-DAB1-47C8-8745-533EB471072C>
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=BE18D39D-3E4C-4C6F-B841-2CCD8D4C3F50>
Download the update
* Microsoft Windows Server 2003 x64 Edition
<http://www.microsoft.com/downloads/details.aspx?FamilyId=D976316D-3B17-4AD4-9198-513FFDAC98E4>
Download the update
Immune Systems:
* Microsoft Windows 98, Microsoft Windows 98 Second Edition (SE), and
Microsoft Windows Millennium Edition (ME)
Plug and Play Vulnerability - CAN-2005-1983:
A remote code execution and local elevation of privilege vulnerability
exists in Plug and Play that could allow an attacker who successfully
exploited this vulnerability to take complete control of the affected
system.
Mitigating Factors for Plug and Play Vulnerability - CAN-2005-1983:
On Windows XP Service Pack 2 and Windows Server 2003 an attacker must have
valid logon credentials and be able to log on locally to exploit this
vulnerability. The vulnerability could not be exploited remotely by
anonymous users or by users who have standard user accounts. However, the
affected component is available remotely to users who have administrative
permissions.
On Windows XP Service Pack 1 an attacker must have valid logon credentials
to try to exploit this vulnerability. The vulnerability could not be
exploited remotely by anonymous users. However, the affected component is
available remotely to users who have standard user accounts.
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.
Workarounds for Plug and Play Vulnerability - CAN-2005-1983:
Microsoft has tested the following workarounds. While 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.
Note Other protocols, such as Internetwork Packet Exchange (IPX) and
Sequenced Packet Exchange (SPX), could be vulnerable to this issue. If you
are using vulnerable protocols such as IPX and SPX, you should block the
appropriate ports for those protocols. For more information about IPX and
SPX, visit the following
<http://www.microsoft.com/resources/documentation/Windows/XP/all/reskit/en-us/prch_cnn_goue.asp>
Microsoft Web site.
Note As mentioned in the Mitigating Factors section, Windows XP Service
Pack 2 and Windows Server 2003 are vulnerable to this issue primarily from
locally logged on users. The following workarounds are designed primarily
for earlier operating system versions that are vulnerable to anonymous
network-based attacks.
Block TCP ports 139 and 445 at the firewall:
These ports are used to initiate a connection with the affected protocol.
Blocking them at the firewall, both inbound and outbound, will help
prevent systems that are behind that firewall from attempts to exploit
this vulnerability. We recommend that you block all unsolicited inbound
communication from the Internet to help prevent attacks that may use other
ports. For more information about ports, visit the following
<http://go.microsoft.com/fwlink/?LinkId=21312> Web site.
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 Service Pack 1.
By default, the Internet Connection Firewall feature in Windows XP Service
Pack 1 helps protect your Internet connection by blocking unsolicited
incoming traffic. We recommend that you block all unsolicited incoming
communication from the Internet.
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,
enable advanced TCP/IP filtering on systems that support this feature.
You can enable advanced TCP/IP filtering to block all unsolicited inbound
traffic. For more information about how to configure TCP/IP filtering, see
<http://support.microsoft.com/kb/309798> Microsoft Knowledge Base Article
309798.
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.
FAQ for Plug and Play Vulnerability - CAN-2005-1983:
What is the scope of the vulnerability?
This is a remote code execution and
<http://go.microsoft.com/fwlink/?LinkId=21142> local privilege elevation
vulnerability. On Windows 2000, an anonymous attacker could remotely try
to exploit this vulnerability. On Windows XP Service Pack 1, only an
authenticated user could remotely try to exploit this vulnerability. On
Window XP Service Pack 2 and Windows Server 2003, only an administrator
can remotely access the affected component. Therefore, on Windows XP
Service Pack 2 and Windows Server 2003, this is strictly a local privilege
elevation vulnerability. An anonymous user cannot remotely attempt to
exploit this vulnerability on Windows XP Service Pack 2 and Windows Server
2003.
An attacker who successfully exploited this vulnerability 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 Plug and Play service.
What is Plug and Play?
<http://www.microsoft.com/technet/prodtechnol/windows2000pro/evaluate/featfunc/plugplay.mspx>
Plug and Play (PnP) allows the operating system to detect new hardware when
you install it on a system. For example, when you install a new mouse on your
system, PnP allows Windows to detect it, allows Windows to load the needed
drivers, and allows Windows to begin using the new mouse.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could take
complete control of the affected system.
How could an attacker exploit the vulnerability?
On Windows 2000, an anonymous attacker could try to exploit the
vulnerability by creating a specially crafted message and sending the
message to an affected system. The message could then cause the affected
system to execute code. This would be possible remotely on Windows XP
Service Pack 1 from authenticated users only. On Windows XP Service Pack 2
and Windows Server 2003, to try to exploit the vulnerability, an attacker
must be able to log on locally to a system and could then run a specially
crafted application.
What systems are primarily at risk from the vulnerability?
Windows 2000 systems are primarily at risk from this vulnerability.On
Windows XP Service Pack 1, Windows XP Service Pack 2, and Windows Server
2003 an attacker must have valid logon credentials to exploit this
vulnerability. The vulnerability could not be exploited remotely by
anonymous users on Windows XP Service Pack 1, Windows XP Service Pack 2,
and Windows Server 2003.
Could the vulnerability be exploited over the Internet?
Yes, by anonymous users on Windows 2000 and by authenticated users on
Windows XP Service Pack 1. 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 protect your PC. End users can visit the
<http://go.microsoft.com/fwlink/?LinkId=21169> Protect Your PC Web site.
IT professionals can visit the
<http://go.microsoft.com/fwlink/?LinkId=21171> Security Guidance Center
Web site. On Windows XP Service Pack 2 and Windows Server 2003, an
attacker must be able to log on to the specific system that is targeted
for attack. An anonymous attacker cannot load and run a program remotely
by using this vulnerability.
What does the update do?
The update removes the vulnerability by modifying the way that the Plug
and Play service validates the length of a message before it passes the
message to the allocated buffer. Additionally, on Windows 2000, the update
restricts anonymous access to the affected components, requiring users to
authenticate with the affected component before attempting to use this
functionality remotely. This change is consistent with the default
settings of Windows XP Service Pack 1.
When this security bulletin was issued, had this vulnerability been
publicly disclosed?
No. Microsoft received information about this vulnerability through
responsible disclosure. Microsoft had not received any information to
indicate that this vulnerability had been publicly disclosed when this
security bulletin was originally issued.
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.
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1983>
CAN-2005-1983
ADDITIONAL INFORMATION
The information has been provided by Microsoft Product Security.
The original article can be found at:
<http://www.microsoft.com/technet/security/Bulletin/MS05-039.mspx>
http://www.microsoft.com/technet/security/Bulletin/MS05-039.mspx
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