Vulnerability In Microsoft Word Exposed

November 29, 2018
Vulnerability In Microsoft Word Exposed

Analysts at Israel-based cyberattack reproduction organization Cymulate are professing to have discovered a weakness in Microsoft Word’s online video include that can enable pernicious performing artists to supplant real YouTube iframe code with noxious HTML/JavaScript code.

In an organization public statement, Cymulate cautions that the unpatched zero-day imperfection requires no extraordinary arrangement to imitate and conceivably influences all clients of Office 2016 and more established forms of the product suite.


Cymulate revealed that it uncovered the bug to Microsoft three months back, noticing anyway that the defect did not meet all requirements for an authorized CVE identifier.

Aggressors could utilize this for malevolent purposes, for example, phishing, as the report will demonstrate the implanted online video with a connection to YouTube, while camouflaging a concealed html/javascript code that will keep running out of sight and could possibly prompt further code execution situations,” clarifies Cymulate.

This attack is carried out by embedding a video inside a Word document, editing the XML file named document.xml, replacing the video link with a crafted payload created by the attacker which opens Internet Explorer Download Manager with the embedded code execution file.


As per the analysts, assailants can abuse the imperfection by first installing a video inside a Word report, at that point unloading the doc with the end goal to single out the record “document.xml.” Next, the components can supplant that XML document’s iframe code with a created payload. “When run, this code will utilize the msSaveOrOpenBlob technique to trigger the download of the executable by opening Internet Explorer Download Manager with the alternative to run or spare the document,” the analysts said in a statement.


Utilizing this endeavor technique, aggressors could possibly trap clients into introducing a phony software update, Cymulate continues, taking note of that potential exploited victims would get no security cautioning when opening the disrupted archive.


Attackers could use this for malicious purposes such as phishing, as the document will show the embedded online video with a link to YouTube, while disguising a hidden html/javascript code that will be running in the background and could potentially lead to further code execution scenarios.


Microsoft has been contacted for inputs but no comments has been released so far.



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