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SYNTHESIS OF THE VULNERABILITY

An attacker can transmit malicious XML data via XML Core Services
to Windows, in order to read a file, scan sites, or trigger a
denial of service.

Impacted products: IE, Windows 2003, Windows 2008, Microsoft
Windows 2012, Windows 7, Windows 8, Windows RT, Windows Vista

Severity: 2/4

Creation date: 10/06/2014

DESCRIPTION OF THE VULNERABILITY

XML data can contain external entities (DTD):

A program which reads these XML data can replace these entities by
data coming from the indicated file. When the program uses XML
data coming from an untrusted source, this behavior leads to:
– content disclosure from files of the server
– private web site scan
– a denial of service by opening a blocking file

This feature must be disabled to process XML data coming from an
untrusted source.

However, Microsoft XML Core Services (MSXML) allows external
entities.

An attacker can therefore transmit malicious XML data to XML Core
Services via Internet Explorer, in order to read a file, scan
sites, or trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Windows-external-XML-entity-injection-via-XML-Core-Services-14874