ZDI-12-036 : Microsoft Internet Explorer VML CDispScroller Remote Code Execution Vulnerability

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ZDI-12-036 : Microsoft Internet Explorer VML CDispScroller Remote Code
Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-036
February 22, 2012

• – CVE ID:
  CVE-2012-0155

• – CVSS:
  7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P

• – Affected Vendors:

Microsoft

• – Affected Products:

Microsoft Internet Explorer

• – TippingPoint(TM) IPS Customer Protection:
  TippingPoint IPS customers have been protected against this
  vulnerability by Digital Vaccine protection filter ID 12102.
  For further product information on the TippingPoint IPS, visit:

  http://www.tippingpoint.com

• – Vulnerability Details:
  This vulnerability allows remote attackers to execute arbitrary code on
  vulnerable installations of Microsoft Internet Explorer. User
  interaction is required to exploit this vulnerability in that the target
  must visit a malicious page or open a malicious file.

The flaw exists within the handling of VML element positioning. When
appending a VML element to a textArea element a reference to a
cDispScroller object can be improperly freed. The object is can be
reused, and due to this object being freed, a later allocation can be
located in this memory region. A remote attacker can exploit this
vulnerability to execute arbitrary code under the context of the process.

• – Vendor Response:

Microsoft has issued an update to correct this vulnerability. More
details can be found at:

http://technet.microsoft.com/en-us/security/bulletin/MS12-010

• – Disclosure Timeline:
  2011-11-29 - Vulnerability reported to vendor

2012-02-22 - Coordinated public release of advisory

• – Credit:
  This vulnerability was discovered by:

• Stephen Fewer of Harmony Security (www.harmonysecurity.com)

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