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AUSCERT External Security Bulletin Redistribution
ESB-2006.0455 -- [Win]
MS06-036 Buffer Overrun in DHCP Client Service Vulnerability
12 July 2006
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AusCERT Security Bulletin Summary
---------------------------------
Product: DHCP Client Service
Publisher: Microsoft
Operating System: Windows Server 2003 x64 Edition
Windows Server 2003 Itanium SP1
Windows Server 2003 Itanium
Windows Server 2003 SP1
Windows Server 2003
Windows XP Professional x64 Edition
Windows XP SP 2
Windows XP SP 1
Windows 2000 SP 4
Impact: Execute Arbitrary Code/Commands
Access: Remote/Unauthenticated
CVE Names: CVE-2006-2372
Original Bulletin:
http://www.microsoft.com/technet/security/Bulletin/MS06-036.mspx
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MS06-036 Buffer Overrun in DHCP Client Service Vulnerability
CVE-2006-2372
Affected Software:
- Microsoft Windows 2000 Service Pack 4
- Microsoft Windows XP Service Pack 1
- Microsoft Windows XP Service Pack 2
- Microsoft Windows XP Professional x64 Edition
- Microsoft Windows Server 2003
- Microsoft Windows Server 2003 Service Pack 1
- Microsoft Windows Server 2003 for Itanium-based Systems
- Microsoft Windows Server 2003 with SP1 for Itanium-based Systems
- Microsoft Windows Server 2003 x64 Edition
Non-Affected Software:
- Microsoft Windows 98
- Microsoft Windows 98 Second Edition (SE)
- Microsoft Windows Millennium Edition (Me)
There is a remote code execution vulnerability in the DHCP Client service
that could allow an attacker who successfully exploited this vulnerability
to take complete control of the affected system.
Mitigating Factors
- ------------------
For an attack to be successful the attacker must send the affected host a
specially crafted DHCP response communication from the same network subnet.
Workarounds
- -----------
Microsoft has tested the following workarounds. Although these workarounds
will not correct the underlying vulnerability, they help block known attack
vectors.
Use a static IP address
To configure the system to use a static IP address follow these steps:
1. Obtain a static IP address from your network administrator
2. Click Start, and then click Control Panel and then click Network and
Internet Connections.
3. Right-click the connection on which you want to specify to use a static
IP address, and then click Properties.
4. Select Internet Protocol (TCP/IP) and click Properties.
5. On the General tab, click on the Use the following IP address and Use
the following DNS server addresses radio buttons.
6. Input your static IP address, subnet mask, default gateway, and DNS
servers.
7. Click Ok twice.
8. Repeat steps 3 through 7 for each of your network adapters.
Disable the DHCP Client service
Disabling the DHCP Client service will help protect the affected system
from attempts to exploit this vulnerability. To disable the DHCP Client
service, follow these steps:
1. Click Start, and then click Control Panel. Alternatively, point to
Settings, and then click Control Panel.
2. Double-click Administrative Tools.
3. Double-click Services.
4. Double-click DHCP Client.
5. In the Startup type list, click Disabled.
6. Click Stop, and then click OK.
You can also stop and disable the DHCP service by using the following
command at the command prompt:
sc stop DHCP & sc config DHCP start= disabled
Impact of Workaround: If you disable the DHCP service, you cannot
automatically retrieve an IP address from a DHCP
Server. Without an IP address you will not be able to
connect to the network.
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
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