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A step-by-step discussion of the latest Flash Player 0-day exploit:
http://secunia.com/blog/210


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TITLE:
Microsoft Excel Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA39122

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/39122/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=39122

RELEASE DATE:
2011-04-15

DISCUSS ADVISORY:
http://secunia.com/advisories/39122/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/39122/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=39122

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
Multiple vulnerabilities have been reported in Microsoft Office
Excel, which can be exploited by malicious people to compromise a
user's system.

1) An integer underflow error when parsing data included in a 400h
substream can be exploited to cause a stack-based buffer overflow.

2) A signedness error when parsing record data from external XLS
files can be exploited to cause a buffer overflow via an external XLS
file defining an overly large record size.

3) Improper calculation of a pointer when parsing RealTimeData
records containing a "stTopic" field that specifies use of
double-byte characters in the following field can be exploited to
corrupt memory when copying data from file.

4) An unspecified error when parsing certain records can be exploited
to corrupt memory.

5) An error when parsing certain records can be exploited to cause a
buffer overflow.

6) Improper initialisation of a variable used as the "count" argument
for a call to memcpy() when parsing certain content can be exploited
to cause a buffer overflow.

7) An array-indexing error when parsing certain records can be
exploited to corrupt memory.

8) An error in the managing of certain data structure members when
parsing certain content can be exploited to corrupt memory.

9) An error in the managing of certain data structure members when
parsing certain content can be exploited to dereference an invalid
pointer value.

Successful exploitation of the vulnerabilities allows execution of
arbitrary code.

SOLUTION:
Apply patches.

Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

PROVIDED AND/OR DISCOVERED BY:
1, 2) Alin Rad Pop, Secunia Research.
4) An anonymous person via iDefense.
3, 6) Aniway via ZDI.

The vendor credits:
3) Muhammad Junaid Bohio, Telus Security Labs.
5) Rodrigo Rubira Branco, Check Point Vulnerability Discovery Team.
7) Aniway via ZDI.
8, 9) An anonymous person via ZDI.

ORIGINAL ADVISORY:
MS11-021 (KB2464583, KB2466146, KB2466156, KB2466158, KB2466169,
KB2489279, KB2502786, KB2505924, KB2505927, KB2505935, KB2525412):
http://www.microsoft.com/technet/security/Bulletin/MS11-021.mspx

Secunia Research:
http://secunia.com/secunia_research/2011-31/
http://secunia.com/secunia_research/2011-32/

iDefense:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=901

ZDI:
http://www.zerodayinitiative.com/advisories/ZDI-11-120/
http://www.zerodayinitiative.com/advisories/ZDI-11-121/

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
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private users keeping their systems up to date against the latest
vulnerabilities.

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