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Credit:
The information has been provided by Microsoft Product Security.
The original article can be found at: http://www.microsoft.com/technet/security/bulletin/ms08-007.mspx
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Affected Software
Operating System - Maximum Security Impact - Aggregate Severity Rating - Bulletins Replaced by this Update
* Windows XP Service Pack 2 - Remote Code Execution - Critical - None
* Windows XP Professional x64 Edition and Windows XP Professional x64 Edition Service Pack 2 - Remote Code Execution - Critical - None
* Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack 2 - Remote Code Execution - Important - None
* Windows Server 2003 x64 Edition and Windows 2003 Server x64 Edition Service Pack 2 - Remote Code Execution - Important - None
* Windows Server 2003 with SP1 for Itanium-based Systems and Windows Server 2003 with SP2 for Itanium based Systems - Remote Code Execution - Important - None
* Windows Vista - Remote Code Execution - Critical - None
* Windows Vista x64 Edition - Remote Code Execution - Critical - None
Non-Affected Software
* Microsoft Windows 2000 Service Pack 4
* Windows Vista Service Pack 1 (all editions)
* Windows Server 2008 (all editions)
Mini-Redirector Heap Overflow Vulnerability - CVE-2008-0080
A remote code execution vulnerability exists in the way that the WebDAV Mini-Redirector handles responses. An attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts.
CVE Information:
CVE-2008-0080
Mitigating Factors for Mini-Redirector Heap Overflow Vulnerability - CVE-2008-0080
Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:
* WebClient service is disabled by default in Windows Server 2003.
Workarounds for Mini-Redirector Heap Overflow Vulnerability - CVE-2008-0080
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:
* Disable the WebClient Service
To disable the WebClient Service, follow these steps:
1. Click Start, click Run, type Services.msc and then click OK.
2. Right-click WebClient service and select Properties.
3. Change the Startup type to Disabled. If the service is running, click Stop.
4. Click OK and exit the management application.
Impact of workaround. WebDAV shares will be inaccessible.
How to undo the workaround. To undo the workaround, follow these steps:
1. Click Start, click Run, type Services.msc and then click OK.
2. Right-click WebClient service and select Properties.
3. Change the Startup type to Automatic and click Apply.
4. Click Start and then click OK and exit the management application.
FAQ for Mini-Redirector Heap Overflow Vulnerability - CVE-2008-0080
What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could 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?
The Mini-Redirector improperly handles malicious WebDAV response.
What is WebDAV?
Web Distributed Authoring and Versioning (WebDAV) is an extension to the Hypertext Transfer Protocol (HTTP) that defines how basic file functions such as copy, move, delete and create are performed by using HTTP.
What is a WebDAV Redirector?
A WebDAV Redirector is a remote file system over the WebDAV protocol that allows Windows client machines to connect to your WebDAV publishing directory through the command line. The WebDAV Redirector enables you to manipulate files on the Web as though the files exist on a mapped network drive.
What is the WebDAV mini-redirector?
The WebDAV mini-redirector is also known as the WebClient service. This service lets DAV-enabled folders appear as UNC (Universal Naming Convention) shares.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
How could an attacker exploit the vulnerability?
An attacker could try to exploit the vulnerability by creating specially crafted WebDAV responses.
What systems are primarily at risk from the vulnerability?
Systems on which WebClient service is enabled are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.
What does the update do?
The update removes the vulnerability by correctly validating WebDAV response.
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. This security bulletin addresses the privately disclosed vulnerability as well as additional issues discovered through internal investigations.
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.
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