[NT] Vulnerability in Active Directory Allows DoS (MS08-003)
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- Date: 13 Feb 2008 10:52:25 +0200
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Vulnerability in Active Directory Allows DoS (MS08-003)
------------------------------------------------------------------------
SUMMARY
This important security update resolves a privately reported vulnerability
in implementations of Active Directory on Microsoft Windows 2000 Server
and Windows Server 2003 and Active Directory Application Mode (ADAM) when
installed on Windows XP and Windows Server 2003. The vulnerability could
allow a denial of service condition. On Windows Server 2003 and Windows XP
an attacker must have valid logon credentials to exploit this
vulnerability. An attacker who successfully exploited this vulnerability
could cause the system to stop responding or automatically restart.
This is an important security update for all supported editions of
Microsoft Windows 2000, and a moderate security update for Windows XP, and
Windows Server 2003. For more information, see the subsection, Affected
and Non-Affected Software, in this section.
This security update addresses the vulnerability by validating client LDAP
requests. For more information about the vulnerability, see the Frequently
Asked Questions (FAQ) subsection for the specific vulnerability entry
under the next section, Vulnerability Information.
Recommendation. Microsoft recommends that customers apply the update at
the earliest opportunity.
DETAILS
Affected Software
Software Component Maximum Security Impact Aggregate Severity
Rating Bulletins Replaced by This Update
* Microsoft Windows 2000 Server Service Pack 4 -
<http://www.microsoft.com/downloads/details.aspx?FamilyID=9df0875d-0466-4974-b4c0-1ecc777173b1> Active Directory (KB943484) - Denial of Service - Important - MS07-039
* Windows XP Professional Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyID=bff7dcb9-5d00-442e-b03c-ce923d213faa> ADAM (KB931374) - Denial of Service - Moderate - None
* Windows XP Professional x64 Edition and Windows XP Professional Edition
Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyID=36e36e1a-ed0d-45a6-b707-766fabc01fbd> ADAM (KB931374) - Denial of Service - Moderate - None
* Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack
2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyID=63d3d784-f057-4686-b85e-ab5fbab5a722> Active Directory (KB943484) - Denial of Service - Moderate - MS07-039
* Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack
2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyID=60781cf3-7c6d-4795-a9d0-bc18ee356e94> ADAM (KB931374) - Denial of Service - Moderate - None
* Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition
Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyID=835d647a-dce6-476e-b7c4-928a67b0acfb> Active Directory (KB943484) - Denial of Service - Moderate - MS07-039
* Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition
Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyID=5e97698d-8150-44f9-9d34-87a0db6ba5a7> ADAM (KB931374) - Denial of Service - Moderate - None
* Windows Server 2003 with SP1 for Itanium-based Systems and Windows
Server 2003 with SP2 for Itanium-based Systems -
<http://www.microsoft.com/downloads/details.aspx?FamilyID=eda8af09-1a4c-4163-a8bb-97dacdebeae4> Active Directory (KB943484) - Denial of Service - Moderate - MS07-039
Non-Affected Software
* Windows Vista
* Windows Vista Service Pack 1 (all editions)
* Windows Vista x64 Edition
* Windows Server 2008 (all editions)
* Windows XP Home Service Pack 2
* Windows XP Tablet Edition Service Pack 2
* Windows XP Media Center Edition Service Pack 2
* Windows 2000 Professional Service Pack 4
Active Directory Vulnerability - CVE-2008-0088
A denial of service vulnerability exists in implementations of Active
Directory on Microsoft Windows 2000 and Windows Server 2003. The
vulnerability also exists in implementations of Active Directory
Application Mode (ADAM) when installed on Windows XP and Windows Server
2003. The vulnerability is due to improper validation of specially crafted
LDAP requests. An attacker who successfully exploited this vulnerability
could cause the computer to stop responding and automatically restart.
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0088>
CVE-2008-0088
Workarounds for Active Directory Vulnerability - CVE-2008-0088
Workaround refers to a setting or configuration change that does not
correct the underlying vulnerability but would help block known attack
vectors before you apply the update. Microsoft has tested the following
workarounds and states in the discussion whether a workaround reduces
functionality:
* Block TCP ports 389 and 3268 at the perimeter firewall
These ports are used to initiate a connection with the affected component.
Blocking it at the enterprise 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, see the TCP and UDP
Port Assignments Web site.
* 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 Active Directory Vulnerability - CVE-2008-0088
What is the scope of the vulnerability?
This is a denial of service vulnerability. An attacker who exploited this
vulnerability could cause the affected system to stop responding and
automatically restart. Note that the denial of service vulnerability would
not allow an attacker to execute code or to elevate their user rights, but
it could cause the affected system to stop accepting requests.
What causes the vulnerability?
The LDAP service performs insufficient checks for specially crafted LDAP
requests.
What is Active Directory?
The main purpose of Active Directory is to provide central authentication
and authorization services for Windows-based computers.
What is Active Directory Application Mode (ADAM)?
ADAM is a Lightweight Directory Access Protocol (LDAP) directory service
that runs as a user service, rather than as a system service.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could cause a
user s system to become non-responsive and restart.
How could an attacker exploit the vulnerability?
An attacker could try to exploit the vulnerability by sending a specially
crafted LDAP packet to the ADAM or an Active Directory server. For Windows
2000 Server, any anonymous user with access to the target network could
deliver a specially crafted network packet to the affected system in order
to exploit this vulnerability. On Windows Server 2003 or systems with ADAM
installed, the attacker must have valid authentication credentials in
order to exploit this vulnerability.
What systems are primarily at risk from the vulnerability?
Lightweight Directory Access Protocol (LDAP) is a requirement for Active
Directory and ADAM. Therefore, any system running as an ADAM or Active
Directory Server is affected by this vulnerability.
What does the update do?
The update removes the vulnerability by validating the specially crafted
client LDAP requests.
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.
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/ms08-003.mspx>
http://www.microsoft.com/technet/security/bulletin/ms08-003.mspx
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