CVE-2018-8378 — Microsoft Office Information Disclosure Vulnerability

Executive Summary

An information disclosure vulnerability exists when Microsoft Office software reads out of bound memory due to an uninitialized variable, which could disclose the contents of memory. An attacker who successfully exploited the vulnerability could view out of bound memory. Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office software. The security update addresses the vulnerability by properly initializing the affected variable.

Overview

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Information Disclosure

Released Aug 14 2018

Last Updated Aug 14 2018

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

13 affected products

Product	KB Article	Severity	Impact	Restart Required
Microsoft Excel Viewer 2007 Service Pack 3	`4022195 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office 2010 Service Pack 2 (32-bit editions) 3213636 (Security Update) 4022198 (Security Update) Important Information Disclosure 3118389 4022173 4022137 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft Office 2010 Service Pack 2 (64-bit editions) 3213636 (Security Update) 4022198 (Security Update) Important Information Disclosure 3118389 4022173 4022137 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft Office 2013 RT Service Pack 1	`4032239 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office 2013 Service Pack 1 (32-bit editions)	`4032239 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office 2013 Service Pack 1 (64-bit editions)	`4032239 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office 2016 (32-bit edition)	`4032233 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office 2016 (64-bit edition)	`4032233 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office 2016 Click-to-Run (C2R) for 32-bit editions	`Click to Run (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office 2016 Click-to-Run (C2R) for 64-bit editions	`Click to Run (Security Update)`	Important	Information Disclosure	No
Microsoft Office Web Apps 2010 Service Pack 2	`4032220 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office Web Apps 2013 Service Pack 1	`4022238 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office Word Viewer 4092433 (Security Update) 4092434 (Security Update) Important Information Disclosure 4018309 4011703 4011703 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft SharePoint Enterprise Server 2013 Service Pack 1 4022234 (Security Update) 4018392 (Security Update) Important Information Disclosure 4022179 4018392 4011586 4011586 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft SharePoint Enterprise Server 2016	`4032256 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft SharePoint Server 2013 Service Pack 1	`4022236 (Security Update)`	Important	Information Disclosure	Maybe
Word Automation Services on Microsoft SharePoint Server 2010 Service Pack 2	`4032215 (Security Update)`	Important	Information Disclosure	Maybe

Patches

9 patches

Article	Type	Restart
`4022195`	Security Update	Maybe
`4032239`	Security Update	Maybe
`4032233`	Security Update	Maybe
`Click to Run`	Security Update	Maybe
`4032220`	Security Update	Maybe
`4022238`	Security Update	Maybe
`4032256`	Security Update	Maybe
`4022236`	Security Update	Maybe
`4032215`	Security Update	Maybe

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Jaanus Kääp of Clarified Security

References

MSRC Advisory MITRE NVD