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Coastal Network Status - Issue Detail
Security
Alert

Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution
Posted: November 16, 2012, 9:05 am
Last Updated: December 23, 2012, 11:20 am

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South Carolina Information Sharing and Analysis Center

 

SC INFORMATION SHARING AND ANALYSIS CENTER BULLETIN

 

DATE ISSUED:        11/15/2012

                                               

SUBJECT:     Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution

 

OVERVIEW:

 

Multiple vulnerabilities have been discovered in Microsoft Office Excel, a spreadsheet application.   These vulnerabilities could allow remote code execution if a user opens a specially crafted Excel file. The file may be received as an email attachment, or downloaded via the web. Successful exploitation could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

 

DESCRIPTION:

 

Four vulnerabilities have been discovered in Microsoft Excel. Three vulnerabilities (Excel SerAuxErrBar Heap Overflow Vulnerability, Excel Memory Corruption Vulnerability, and Excel SST Invalid Length Use After Free) are caused by the way that Microsoft Excel handles memory when opening specially crafted Excel files.  A fourth vulnerability (Excel Stack Overflow Vulnerability) is caused when Microsoft Excel encounters a modified data structure while parsing a specially crafted Excel file, corrupting system memory in such a way that an attacker could execute arbitrary code.

 

These vulnerabilities can be exploited by opening a malicious Excel file received as an email attachment, or by visiting a website that is hosting a malicious Excel document. An attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

 

SYSTEMS AFFECTED:

·          Microsoft Office 2003

·         Microsoft Office 2007

·         Microsoft Office 2010

·         Microsoft Office 2008 for Mac

·         Microsoft Office 2011 for Mac

·         Microsoft Excel Viewer

·         Microsoft Office Compatibility Pack

 

 RISK:

Government:

  • Large and medium government entities: High
  • Small government entities: High

 

Businesses:

  • Large and medium business entities: High
  • Small business entities: High 

 

Home users: High

 

RECOMMENDATIONS:

We recommend the following actions be taken:

 

  • Apply appropriate patches provided by Microsoft to vulnerable systems immediately after appropriate testing.
  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Remind users not to open e-mail attachments from unknown users or suspicious e-mails from trusted sources.
  • Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.

 

REFERENCES:

Microsoft:

http://technet.microsoft.com/en-us/security/bulletin/ms12-076

 

CVE:

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-1885

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-1886

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-1887

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2543

 

Security Focus:

http://www.securityfocus.com/bid/56425

http://www.securityfocus.com/bid/56431

http://www.securityfocus.com/bid/56426

http://www.securityfocus.com/bid/56430

 

Please feel free to contact the SC ISAC if you have any questions or need any additional information.

 

The SC ISAC will provide amplifying information as it becomes available.

 

SC-ISAC Contact Information

 

Email: SC-ISAC@cio.sc.gov

SC ISAC Security Line: 803-896-1650

24-hour hotline: +1 803-896-0001

Fax: +1 803-896-0375

Postal address:

 

SC-ISAC

DSIT Budget and Control Board

4430 Broad River Road

Columbia S.C. 29210

SC-ISAC is available via hotline 08:00-17:00 EST (GMT-5)/ EDT (GMT-4)

Monday through Friday

 

Using Encryption

 

We strongly urge you to encrypt sensitive information sent by email. Our

public PGP key is available from:

 

https://sc-isac.sc.gov/public.key

 

NO WARRANTY

 

Any material furnished by SC-ISAC is furnished on an "as is" basis.

 

SC-ISAC makes no warranties of any kind, either expressed or implied as to

any matter including, but not limited to, warranty of fitness for a particular

purpose or merchantability, exclusivity or results obtained from use of the

material. SC-ISAC does not make any warranty of any kind with respect to

freedom from patent, trademark, or copyright infringement.

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