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

Hash: SHA1

ZDI-12-036 : Microsoft Internet Explorer VML CDispScroller Remote Code
Execution Vulnerability
February 22, 2012

- -- CVE ID:

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

- -- Affected Vendors:


- -- 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:


- -- 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:


- -- 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)

- -- About the Zero Day Initiative (ZDI):
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a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:


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used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
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