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Original release date: June 22, 2012

Last revised: —

Source: US-CERT

 

Systems Affected

 

Microsoft XML Core Services 3.0, 4.0, 5.0, and 6.0 are affected.

Microsoft Internet Explorer, Microsoft Office 2003, and Microsoft

Office 2007 are affected due to their use of XML Core Services.

 

 

Overview

 

Microsoft Security Advisory (2719615) warns of active attacks using

a vulnerability in Microsoft XML Core Services. Microsoft Internet

Explorer and Microsoft Office can be used as attack vectors.

 

 

Description

 

Microsoft Security Advisory (2719615), a Google Online Security

blog post, Sophos, and other sources report active attacks

exploiting a vulnerability in Microsoft XML Core Services

(CVE-2012-1889). Attack scenarios involve exploits served by

compromised web sites and delivered in Office documents. Reliable

public exploit code is available, and attacks may become more

widespread.

 

 

Impact

 

By convincing a victim to view a specially crafted web page or

Office document, an attacker could execute arbitrary code and take

any action as the victim.

 

 

Solution

 

As of June 22, 2012, a comprehensive update is not available.

Consider the following workarounds.

 

Apply Fix it

 

Apply the Fix it solution described in Microsoft Knowledge Base

Article 2719615. This solution uses the Application

Compatibility Database feature to make runtime modifications to

XML Core Services to patch the vulnerability.

 

Disable scripting

 

Configure Internet Explorer to disable Active Scripting in the

Internet  and Local intranet zones as described in Microsoft

Security Advisory (2719615). See also Securing Your Web Browser.

 

Use the Enhanced Mitigation Experience Toolkit (EMET)

 

EMET is a utility to configure Windows runtime mitigation

features such as Data Execution Prevention (DEP), Address Space

Layout Randomization (ASLR), and Structured Exception Handler

Overwrite Protection (SEHOP). These features, particularly the

combination of system-wide DEP and ASLR, make it more difficult

for an attacker to successfully exploit a vulnerability.

Configure EMET for Internet Explorer as described in Microsoft

Security Advisory (2719615).

 

 

References

 

* Microsoft Security Advisory (2719615) –

<https://technet.microsoft.com/en-us/security/advisory/2719615>

 

* Microsoft Security Advisory: Vulnerability in Microsoft XML Core

Services could allow remote code execution –

<http://support.microsoft.com/kb/2719615>

 

* NVD Vulnerability Summary for CVE-2012-1889 –

<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-1889>

 

* Microsoft XML vulnerability under active exploitation –

<http://googleonlinesecurity.blogspot.com/2012/06/microsoft-xml-vulnerability-under.html>

 

* European aeronautical supplier’s website infected with “state-sponsored” zero-day exploit –

<http://nakedsecurity.sophos.com/2012/06/20/aeronautical-state-sponsored-exploit/>

 

* Securing Your Web Browser –

<https://www.us-cert.gov/reading_room/securing_browser/>

 

* Application Compatibility Database –

<http://msdn.microsoft.com/en-us/library/bb432182(v=vs.85).aspx>