CVE-2016-7291 - Out-of-bounds Read

Severity

57%

Complexity

86%

Confidentiality

81%

Microsoft Word 2007 SP3, Office 2010 SP2, Word 2010 SP2, Office Compatibility Pack SP3, Word for Mac 2011, Word Automation Services on SharePoint Server 2010 SP2, and Office Web Apps 2010 SP2 allow remote attackers to obtain sensitive information from process memory or cause a denial of service (out-of-bounds read) via a crafted document, aka "Microsoft Office Information Disclosure Vulnerability," a different vulnerability than CVE-2016-7290.

Microsoft Word 2007 SP3, Office 2010 SP2, Word 2010 SP2, Office Compatibility Pack SP3, Word for Mac 2011, Word Automation Services on SharePoint Server 2010 SP2, and Office Web Apps 2010 SP2 allow remote attackers to obtain sensitive information from process memory or cause a denial of service (out-of-bounds read) via a crafted document, aka "Microsoft Office Information Disclosure Vulnerability," a different vulnerability than CVE-2016-7290.

CVSS 3.0 Base Score 7.1. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H).

CVSS 2.0 Base Score 5.8. CVSS Attack Vector: network. CVSS Attack Complexity: medium. CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:P).

Demo Examples

Out-of-bounds Read

CWE-125

In the following code, the method retrieves a value from an array at a specific array index location that is given as an input parameter to the method


               
}
return value;// check that the array index is less than the maximum// length of the array
value = array[index];// get the value at the specified index of the array
// if array index is invalid then output error message// and return value indicating error
value = -1;

However, this method only verifies that the given array index is less than the maximum length of the array but does not check for the minimum value (CWE-839). This will allow a negative value to be accepted as the input array index, which will result in a out of bounds read (CWE-125) and may allow access to sensitive memory. The input array index should be checked to verify that is within the maximum and minimum range required for the array (CWE-129). In this example the if statement should be modified to include a minimum range check, as shown below.


               
...// check that the array index is within the correct// range of values for the array

Overview

Type

Microsoft

First reported 8 years ago

2016-12-20 06:59:00

Last updated 6 years ago

2018-10-12 22:14:00

Affected Software

Microsoft Office Compatibility Pack Service Pack 3

Microsoft Office Web Apps 2010 Service Pack 2

2010

Microsoft Sharepoint Server 2010 Service Pack 2

2010

Microsoft Word 2007 Service Pack 3

2007

Microsoft Word 2010 Service Pack 2

2010

Microsoft Word for Mac 2011

2011

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