Home Vulnerability Simply Opening A Doc in LibreOffice Can Hack Your Pc (Unpatched)

Simply Opening A Doc in LibreOffice Can Hack Your Pc (Unpatched)

by Swati Khandelwal
libreoffice vulnerability

Are you utilizing LibreOffice?

Try to be additional cautious about what doc information you open utilizing the LibreOffice software program over the following few days.

That is as a result of LibreOffice comprises a extreme unpatched code execution vulnerability that would sneak malware into your system as quickly as you open a maliciously-crafted doc file.

LibreOffice is likely one of the hottest and open supply alternate options to Microsoft Workplace suite and is accessible for Home windows, Linux and macOS programs.

Earlier this month, LibreOffice released the newest model 6.2.5 of its software program that addresses two extreme vulnerabilities (CVE-2019-9848 and CVE-2019-9849), however the patch for the previous has now been bypassed, safety researcher Alex Inführ claims.

Although Inführ has not but disclosed particulars of the approach that allowed him to bypass the patch, the impression of this vulnerability stays the identical, as defined under.

1.) CVE-2019-9848: This vulnerability, which nonetheless exists within the newest model, resides in LibreLogo, a programmable turtle vector graphics script that ships by default with LibreOffice.

LibreLogo permits customers to specify pre-installed scripts in a doc that may be executed on numerous occasions akin to mouse-over.

libreoffice vulnerability exploit

Found by Nils Emmerich, the flaw might permit an attacker to craft a malicious doc that may silently execute arbitrary python instructions with out displaying any warning to a focused consumer.

“The massive downside right here is that the code isn’t translated properly and simply supplying python code because the script code typically leads to the identical code after translation,” Emmerich stated.

“Utilizing varieties and OnFocus occasion, it’s even potential to get code execution when the doc is opened, with out the necessity for a mouse-over occasion.”

Emmerich additionally launched a proof-of-concept for this attack on his weblog put up.

2.) CVE-2019-9849: This vulnerability, which you’ll be able to repair by putting in the newest accessible replace, might permit the inclusion of distant arbitrary content material inside a doc even when ‘stealth mode’ is enabled.

The stealth mode isn’t enabled by default, however customers can activate it to instruct paperwork retrieve distant sources solely from trusted places.

Easy methods to Shield Your System

Install LibreOffice

Till the LibreOffice staff releases a patch to repair the bypass, customers are really useful to replace or reinstall the software program with out macros or no less than with out LibreLogo element, by following the below-mentioned steps.

  • Open the setup to start out the set up
  • Choose “Customized” set up
  • Increase “Non-compulsory Elements”
  • Click on on “LibreLogo” and choose “This Function Will Not Be Obtainable”
  • Click on Subsequent after which Set up the software program



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