CVE-2021-28454 - Use After Free

Severity

78%

Complexity

18%

Confidentiality

98%

Microsoft Excel Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-28451.

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 3 years ago

2021-04-13 20:15:00

Last updated 3 years ago

2021-04-20 22:21:00

Affected Software

Microsoft 365 Apps Enterprise Edition

Microsoft Office 2013 SP1

2013

Microsoft Office 2013 Service Pack 1 RT Edition

2013

Microsoft Office 2016

2016

Microsoft Office 2019

2019
-

Microsoft Office Web Apps Server 2013 Service Pack 1

2013

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28454

https://www.zerodayinitiative.com/advisories/ZDI-21-410/

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28454

Patch, Vendor Advisory

https://www.zerodayinitiative.com/advisories/ZDI-21-410/

Third Party Advisory, VDB Entry

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