Multiple DLL side loading vulnerabilities were found in the OLE DB Provider for Oracle. These issues can be exploited by loading various OLE components as an embedded OLE object. When instantiating the object Windows will try to load the DLLs oci.dll, and ociw32.dll from the current working directory. If an attacker convinces the user to open a specially crafted (Office) document from a directory also containing the attacker's DLL file, it is possible to execute arbitrary code with the privileges of the target user. This can potentially result in the attacker taking complete control of the affected system.
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OLE DB Provider for Oracle multiple DLL side loading vulnerabilities
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Yorick Koster, August 2015
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Abstract
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Multiple DLL side loading vulnerabilities were found in the OLE DB
Provider for Oracle. These issues can be exploited by loading various
OLE components as an embedded OLE object. When instantiating the object
Windows will try to load the DLLs oci.dll, and ociw32.dll from the
current working directory. If an attacker convinces the user to open a
specially crafted (Office) document from a directory also containing the
attacker's DLL file, it is possible to execute arbitrary code with the
privileges of the target user. This can potentially result in the
attacker taking complete control of the affected system.
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See also
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http://www.greyhathacker.net/docs/OfficeDLLhijacking.zip
https://securify.nl/blog/SFY20151201/there_s_a_party_in_ole__and_you_are_invited.html
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Tested versions
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This issue was successfully verified on Windows 7 + Office 2007 32-bit,
Windows Vista + Office 2010 32-bit, Windows 7 + Office 2013 32-bit.
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Fix
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There is currently no fix available.
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Details
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https://www.securify.nl/advisory/SFY20150806/ole_db_provider_for_oracle_multiple_dll_side_loading_vulnerabilities.html
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