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Sid 1-45123

Message

FILE-OFFICE Microsoft Office Excel malformed spreadsheet use-after-free attempt

Summary

This event is generated when a malformed Microsoft Office Excel file is found traversing the network via HTTP, IMAP, POP3, or FTP.

Impact

Attempted Administrator Privilege Gain

CVE-2017-11935:

CVSS base score 7.8

CVSS impact score 5.9

CVSS exploitability score 1.8

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Detailed information

CVE-2017-11935: Microsoft Office 2016 Click-to-Run (C2R) allows a remote code execution vulnerability due to the way files are handled in memory, aka "Microsoft Excel Remote Code Execution Vulnerability".

Affected systems

  • microsoft office 2016

Ease of attack

Medium, no exploits publicly available.

False positives

False negatives

Corrective action

Ensure that Microsoft Updates are set for regular intervals for the best chance of staying protected.

Contributors

  • Cisco's Talos Intelligence Group

Additional References

  • portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-11935