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Shutdown UX DLL Hijacking

Shutdown UX DLL Hijacking
Posted Dec 17, 2015
Authored by Yorick Koster, Securify B.V.

A DLL side loading vulnerability was found in the Shutdown UX DLL. This issue can be exploited by loading the Authentication UI Shutdown Choices object as an embedded OLE object. When instantiating the object Windows will try to load the DLL wuaext.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.

tags | advisory, arbitrary
systems | windows
advisories | CVE-2015-6128, CVE-2015-6132
SHA-256 | b96ff440d177a2b1c8d194a3eeb5ba6a3405ca91223f3d328cdc4c4755b3ac20

Shutdown UX DLL Hijacking

Change Mirror Download
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Shutdown UX DLL side loading vulnerability
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Yorick Koster, November 2015

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Abstract
------------------------------------------------------------------------
A DLL side loading vulnerability was found in the Shutdown UX DLL. This
issue can be exploited by loading the Authentication UI Shutdown Choices
object as an embedded OLE object. When instantiating the object Windows
will try to load the DLL wuaext.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://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6128
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6132
https://technet.microsoft.com/library/security/MS15-132
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 10 + Office 2016 64-bit.

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Fix
------------------------------------------------------------------------
Microsoft released MS15-132 [4] that fixes this vulnerability.

------------------------------------------------------------------------
Details
------------------------------------------------------------------------
https://www.securify.nl/advisory/SFY20151102/shutdown_ux_dll_side_loading_vulnerability.html
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