SB2009060902 - Multiple vulnerabilities in Microsoft Excel

Description

This security bulletin contains information about 7 secuirty vulnerabilities.

1) Memory corruption (CVE-ID: CVE-2009-1134)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to buffer overflow when parsing the Excel spreadsheet file format. A remote attacker can create a specially crafted Excel file containing a malformed record pointer, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system with privileges of the current user.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

Note: according to reports this vulnerability was being actively exploited before Microsoft issued security patch.

2) Integer Overflow or Wraparound (CVE-ID: CVE-2009-0561)

The vulnerability alows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to integer overflow when parsing the Excel spreadsheet file format. A remote attacker can create a specially crafted Excel file containing a malformed object record, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system with privileges of the current user.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

3) Memory corruption (CVE-ID: CVE-2009-0560)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to field sanitization error when parsing the Excel spreadsheet file format. A remote attacker can create a specially crafted Excel file containing a malformed record object, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system with privileges of the current user.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

4) Stack-based buffer overflow (CVE-ID: CVE-2009-0559)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to stack-based buffer overflow when parsing of the Excel spreadsheet file format. A remote attacker can create a specially crafted Excel file containing an overly long string copy, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system with privileges of the current user.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

5) Memory corruption (CVE-ID: CVE-2009-0558)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to array indexing error when parsing the Excel spreadsheet file format. A remote attacker can create a specially crafted Excel file containing a malformed object record, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system with privileges of the current user.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

6) Buffer overflow (CVE-ID: CVE-2009-0557)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to buffer overflow when parsing the Excel spreadsheet file format. A remote attacker can create a specially crafted Excel file, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system with privileges of the current user.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

7) Buffer overflow (CVE-ID: CVE-2009-0549)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to buffer overflow when parsing the Excel spreadsheet file format. A remote attacker can create a specially crafted Excel file, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system with privileges of the current user.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

Remediation

Install update from vendor's website.

References

• https://technet.microsoft.com/en-us/library/security/ms09-021.aspx
• https://fe-ddis.dk/cfcs/CFCSDocuments/Zeroday.pdf