full-disclosure - ZDI-12-157 : Microsoft Excel Series Record Parsing Type Mismatch Remote Code Execution Vulnerability

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Date: Wed, 22 Aug 2012 16:21:47 +0000
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: "'full-disclosure@...ts.grok.org.uk'" <full-disclosure@...ts.grok.org.uk>, 
	"'bugtraq@...urityfocus.com'" <bugtraq@...urityfocus.com>
Cc: ZDI Disclosures <zdi-disclosures@...com>
Subject: ZDI-12-157 : Microsoft Excel Series Record
 Parsing Type Mismatch Remote Code Execution Vulnerability

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ZDI-12-157 : Microsoft Excel Series Record Parsing Type Mismatch Remote
Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-157
August 22, 2012

- -- CVE ID:
CVE-2012-1847

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

- -- Affected Vendors:
Microsoft

- -- Affected Products:
Microsoft Office

- -- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 12480.
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 Office Excel. 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 parsing of Series records. The code
within Excel.exe makes an assumption about the data types within a Series
record and can be made to write beyond the bounds of a heap buffer when a
specific combination of fields are set to unexpected values. This
corruption can be leveraged to achieve code execution under the context of
the user running the application. 

- -- Vendor Response:
Microsoft has issued an update to correct this vulnerability. More details
can be found at:
https://technet.microsoft.com/en-us/security/bulletin/MS12-030

- -- Disclosure Timeline:
2012-01-24 - 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

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