Check: DTOO143 - Excel
Microsoft Excel 2010:
DTOO143 - Excel
(in version v1 r2)
Title
File types must be configured to provide mismatch warnings. (Cat II impact)
Discussion
Excel can load files with extensions that do not match the files' type. For example, if a comma-separated values (CSV) file named example.csv is renamed example.xls, Excel can properly load it as a CSV file. Some attacks target specific file formats. If Excel is allowed to load files with extensions that do not match their file types, a malicious person can deceive users into loading dangerous files that have incorrect extensions. By default, if users attempt to open files with the wrong extension, Excel opens the file and displays a warning that the file type is not what Excel expected.
Check Content
Fix Text
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security “Force file extension to match file type” to “Enabled (Allow different, but warn)”.
Additional Identifiers
Rule ID: SV-33440r1_rule
Vulnerability ID: V-17621
Group Title:
Expert Comments
CCIs
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No CCIs are assigned to this check |
Controls
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No controls are assigned to this check |