-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

ZDI-12-158 : Microsoft Internet Explorer MSADO CacheSize Remote Code
Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-158
August 22, 2012

- -- CVE ID:
CVE-2012-1891

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

- -- Affected Vendors:
Microsoft

- -- Affected Products:
Microsoft Internet Explorer 9

- -- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 10761.
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 specific flaw exists within the MSADO component. When handling the a
user specified CacheSize property the process uses this value to calculate
the 'real' cache size. This value is used without proper validation. A
remote attacker can exploit this vulnerability to execute arbitrary code
under the context of the browser. This bug is a failed fix for
CVE-2011-0027 / http://www.zerodayinitiative.com/advisories/ZDI-11-002/


- -- 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/ms12-045

- -- Disclosure Timeline:
2012-02-13 - Vulnerability reported to vendor
2012-08-22 - Coordinated public release of advisory

- -- Credit:
This vulnerability was discovered by:
* Anonymous

- -- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents 
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:

    http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
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
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

    http://www.zerodayinitiative.com/advisories/disclosure_policy/

Follow the ZDI on Twitter:

    http://twitter.com/thezdi

-----BEGIN PGP SIGNATURE-----
Version: PGP Desktop 10.2.0 (Build 1950)
Charset: utf-8

wsBVAwUBUDUHcVVtgMGTo1scAQILrgf/aH/JINoyJwdDIbMV5vsllkW6NktM1NPS
ax9+zRYjY2UCS9JT+Q6iW7f0AQNFkuCLojff385mtrMvYrZiFbHbiUoFUiA2yUOF
KWWe9nsVN9m8kbM4YUQ3l4e5HmEoyhPzt7z3wHSxE5bXiTR1Bnw07UguLA/M/xuY
hJGJ1gngFztkUepQ6szAk3VDUlLGMx8gWBgIHbFfqQNMOb3pZWKtOl20Ov/eO567
PT1KNfAdMJtgEa7ypBpuF6PBbcHJDlLMfIfTlRAW5zn7KBaU/DvdjZdKD4+A6IvV
K8SMLB8j/AzsQ7ZVjO2CnwYe9uuqn4/NV5TUugCm4BNUIGLQJD6qBA==
=uvhX
-----END PGP SIGNATURE-----