CVE-2020-16929 - Use After Free

Severity

78%

Complexity

18%

Confidentiality

98%

A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle objects in memory, aka 'Microsoft Excel Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-16930, CVE-2020-16931, CVE-2020-16932.

CVSS 3.1 Base Score 7.8. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 6.8. CVSS Attack Vector: network. CVSS Attack Complexity: medium. CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:P/A:P).

Demo Examples

Use After Free

CWE-416

The following example demonstrates the weakness.


               
}
free(buf3R2);

Use After Free

CWE-416

The following code illustrates a use after free error:


               
}
free(ptr);
logError("operation aborted before commit", ptr);

When an error occurs, the pointer is immediately freed. However, this pointer is later incorrectly used in the logError function.

Overview

Type

Microsoft

First reported 4 years ago

2020-10-16 23:15:00

Last updated 4 years ago

2020-10-20 13:28:00

Affected Software

Microsoft 365 Apps

Microsoft Excel 2013 Service Pack 1

2013

Microsoft Excel 2013 Service Pack 1 Runtime Edition

2013

Microsoft Excel 2016

2016

Microsoft Office 2013 SP1

2013

Microsoft Office 2013 Service Pack 1 RT Edition

2013

Microsoft Office 2016

2016

Microsoft Office 2016 for MacOS

2016
macos

Microsoft Office 2019

2019
-

Microsoft Office 2019 for macOS

2019
macos

Microsoft Office Online Server 1.0

1.0

Microsoft Office Web Apps 2010 Service Pack 2

2010

Microsoft Office Web Apps 2013 Service Pack 1

2013

Microsoft Sharepoint Enterprise Server 2013 Service Pack 1

2013

Microsoft Sharepoint Server 2010 Service Pack 2

2010

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