|Title||Vulnerability in Microsoft Malware Protection Engine Could Allow Remote Code Execution|
|Name||KB2846338||First vendor Publication||2013-05-14|
|Vendor||Microsoft||Last vendor Modification||1970-01-01|
Security-Database Scoring CVSS v2
|Cvss vector : (AV:N/AC:M/Au:N/C:C/I:C/A:C)|
|Cvss Base Score||9.3||Attack Range||Network|
|Cvss Impact Score||10||Attack Complexity||Medium|
|Cvss Expoit Score||8.6||Authentication||None Required|
|Calculate full CVSS 2.0 Vectors scores|
Microsoft is releasing this security advisory to help ensure customers are aware that an update to the Microsoft Malware Protection Engine also addresses a security vulnerability reported to Microsoft. The update addresses a vulnerability that could allow remote code execution if the Microsoft Malware Protection Engine scans a specially crafted file. An attacker who successfully exploited this vulnerability could execute arbitrary code in the security context of the LocalSystem account and take complete control of the system.
This vulnerability has been publicly disclosed as a denial of service.
The Microsoft Malware Protection Engine is a part of several Microsoft antimalware products. See the Affected Software section for a list of affected products. Updates to the Microsoft Malware Protection Engine are installed along with the updated malware definitions for the affected products. Administrators of enterprise installations should follow their established internal processes to ensure that the definition and engine updates are approved in their update management software, and that clients consume the updates accordingly.
Typically, no action is required of enterprise administrators or end users to install updates for the Microsoft Malware Protection Engine, because the built-in mechanism for the automatic detection and deployment of updates will apply the update within the next 48 hours. The exact time frame depends on the software used, Internet connection, and infrastructure configuration.
For more information about this issue, see the following references:
*If your version of the Microsoft Malware Protection Engine is equal to or greater than this version, then you are not affected by this vulnerability and do not need to take any further action. For more information on how to verify the engine version number that your software is currently using, see the section, "Verifying Update Installation", in Microsoft Knowledge Base Article 2510781.
The following software have been tested to determine which versions or editions are affected. Other versions or editions are either past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, visit Microsoft Support Lifecycle.
The Microsoft Malware Protection Engine is a part of several Microsoft antimalware products. Depending upon which affected Microsoft antimalware product is installed, this update may have different severity ratings. The following severity ratings assume the potential maximum impact of the vulnerability.
Applies only to April 2013 or earlier versions of the Microsoft Malicious Software Removal Tool.
The following table provides an exploitability assessment of the vulnerability addressed in this advisory.
How do I use this table?
Use this table to learn about the likelihood of functioning exploit code being released within 30 days of this advisory release. You should review the assessment below, in accordance with your specific configuration, in order to prioritize your deployment. For more information about what these ratings mean, and how they are determined, please see Microsoft Exploitability Index.
Is Microsoft releasing a Security Bulletin to address this vulnerability?
Typically, no action is required of enterprise administrators or end users to install this update.
Why is typically no action required to install this update?
For enterprise deployments as well as end users, the default configuration in Microsoft antimalware software helps ensure that malware definitions and the Microsoft Malware Protection Engine are kept up to date automatically. Product documentation also recommends that products are configured for automatic updating.
Best practices recommend that customers regularly verify whether software distribution, such as the automatic deployment of Microsoft Malware Protection Engine updates and malware definitions, is working as expected in their environment.
How often are the Microsoft Malware Protection Engine and malware definitions updated?
Depending on which Microsoft antimalware software is used and how it is configured, the software may search for engine and definition updates every day when connected to the Internet, up to multiple times daily. Customers can also choose to manually check for updates at any time.
How can I install the update?
What is the Microsoft Malware Protection Engine?
Where can I find more information about Microsoft antimalware technology?
What is the scope of the vulnerability?
What causes the vulnerability?
What might an attacker use the vulnerability to do?
What is the LocalSystem account?
How could an attacker exploit the vulnerability?
If the affected antimalware software has real-time protection turned on, the Microsoft Malware Protection Engine will scan files automatically, leading to exploitation of the vulnerability when the specially crafted file scanned. If real-time scanning is not enabled, the attacker would need to wait until a scheduled scan occurs in order for the vulnerability to be exploited.
In addition, exploitation of the vulnerability could occur when the system is scanned using an affected version of the Malicious Software Removal Tool (MSRT).
What systems are primarily at risk from the vulnerability?
What does the update do?
When this security advisory was issued, had this vulnerability been publicly disclosed?
When this security advisory was issued, had Microsoft received any reports that this vulnerability was being exploited?
Verify the update is installed
Customers should verify that the latest version of the Microsoft Malware Protection Engine and definition updates are being actively downloaded and installed for their Microsoft antimalware products.
For more information on how to verify the version number for the Microsoft Malware Protection Engine that your software is currently using, see the section, "Verifying Update Installation", in Microsoft Knowledge Base Article 2510781.
For affected software, verify that the Microsoft Malware Protection Engine version is 1.1.9506.0 or later.
If necessary, install the update
Administrators of enterprise antimalware deployments should ensure that their update management software is configured to automatically approve and distribute engine updates and new malware definitions. Enterprise administrators should also verify that the latest version of the Microsoft Malware Protection Engine and definition updates are being actively downloaded, approved and deployed in their environment.
For end-users, the affected software provide built-in mechanisms for the automatic detection and deployment of this update. For these customers the update will be applied within 48 hours of its availability. The exact time frame depends on the software used, Internet connection, and infrastructure configuration. End users that do not wish to wait can manually update their antimalware software.
For more information on how to manually update the Microsoft Malware Protection Engine and malware definitions, refer to Microsoft Knowledge Base Article 2510781.
|Url : http://www.microsoft.com/technet/security/advisory/2846338.mspx|
CWE : Common Weakness Enumeration
|CWE-119||Failure to Constrain Operations within the Bounds of a Memory Buffer|
CPE : Common Platform Enumeration
Information Assurance Vulnerability Management (IAVM)
|2013-05-23||IAVM : 2013-A-0110 - Microsoft Malware Protection Engine Remote Code Execution Vulnerability|
Severity : Category II - VMSKEY : V0038289
Nessus® Vulnerability Scanner
|2013-05-15||Name : The remote host has an anti-malware application that is affected by a code ex...|
File : smb_kb2846338.nasl - Type : ACT_GATHER_INFO