Microsoft Security Bulletin: April 2010
Qualys® Vulnerability R&D Lab has released new vulnerability checks in the Qualys Cloud Platform to protect organizations against 3 vulnerabilities that were fixed in 1 bulletins announced today by Microsoft. Customers can immediately audit their networks for these and other new vulnerabilities by accessing their Qualys subscription. Visit our blog to see how to prioritize remediation.
Microsoft has released 1 security bulletins to fix newly discovered flaws in their software. Qualys has released the following checks for these new vulnerabilities:
Microsoft SharePoint Elevation of Privilege Vulnerability (MS10-039 and KB983438)
- Critical 4
- Qualys ID
- Vendor Reference
- KB983438, MS10-039
- CVE Reference
- CVE-2010-0817, CVE-2010-1257, CVE-2010-1264
- CVSS Scores
- Base 4.3 / Temporal 3.4
Windows SharePoint Services 3.0 provides a platform for collaborative applications, offering a common framework for document management and a common repository for storing documents of all types. Microsoft Office SharePoint Server 2007 is an integrated suite of server capabilities built on top of Windows SharePoint Services 3.0.
SharePoint is prone to the following vulnerabilities:
- Microsoft Windows SharePoint Services 3.0 and Microsoft Office SharePoint Server 2007 do not properly validate input that is provided to an HTML query before sending this input to the browser.
- A vulnerability is caused by the way that the toStaticHTML API sanitizes HTML on a SharePoint site.
- A vulnerability exists due to the way that Microsoft SharePoint handles specially crafted requests sent to the Help page.
Microsoft has released a security update that addresses these vulnerabilities by modifying the way that Microsoft SharePoint validates input that is provided to an HTTP query, the way that toStaticHTML sanitizes HTML content in Microsoft SharePoint, and the way that Microsoft SharePoint handles specially crafted requests to the Help page.
This security update also addresses the vulnerability first described in Microsoft Security Advisory 983438.
- The vulnerability could allow an attacker to run arbitrary script that could result in elevation of privilege within the SharePoint site, as opposed to elevation of privilege within the workstation or server environment.
Following are links for downloading patches to fix the vulnerabilities:
Refer to Microsoft Security Bulletin MS10-039 for further details.
- Restrict Access to SharePoint Help.aspx
An administrator can apply an access control list to SharePoint Help.aspx to ensure that it can no longer be loaded. This effectively prevents exploitation of the vulnerability using this attack vector.
Impact of the workaround: This workaround will disable all help functionality from the SharePoint server.
- Set Internet and Local intranet security zone settings to "High" to prompt before running ActiveX Controls and Active Scripting.
Impact of the workaround: On visiting Web sites on the Internet or Intranet that use ActiveX or Active Scripting to provide additional functionality, you will be prompted frequently when you enable this workaround.
These new vulnerability checks are included in Qualys vulnerability signature 1.26.54-3. Each Qualys account is automatically updated with the latest vulnerability signatures as they become available. To view the vulnerability signature version in your account, from the Qualys Help menu, select the About tab.
Selective Scan Instructions Using Qualys
To perform a selective vulnerability scan, configure a scan profile to use the following options:
- Ensure access to TCP ports 135 and 139 are available.
- Enable Windows Authentication (specify Authentication Records).
Enable the following Qualys IDs:
- If you would like the scan to return the Windows Hostname, also include QID 82044 and ensure access to UDP port 137 is available.
- If you would like to be notified if Qualys is unable to log on to a host (if Authentication fails), also include QID 105015.
In addition, prior to running a scan for these new vulnerabilities, you can estimate your exposure to these new threats by running the Risk Analysis Report, available from the Qualys Vulnerability Management Reports tab.
Access for Qualys Customers
For more information, customers may contact Qualys Technical Support.
The Qualys Cloud Platform and its integrated suite of security and compliance applications provides organizations of all sizes with a global view of their security and compliance solutions, while drastically reducing their total cost of ownership. Qualys solutions include: continuous monitoring, vulnerability management, policy compliance, PCI compliance, security assessment questionnaire, web application scanning, web application firewall, malware detection and SECURE Seal for security testing of web sites.