Microsoft Office 2007 12.0.6015.5000 and MSO 12.0.6017.5000 do not sign the metadata of Office Open XML (OOXML) documents, which makes it easier for remote attackers to modify Dublin Core metadata fields, as demonstrated by the (1) LastModifiedBy and (2) creator fields in docProps/core.xml in the OOXML ZIP container.
CVSS Severity (version 2.0):
Impact Subscore: 4.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification
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20071212 MS Office 2007: Digital Signature does not protect Meta-Data