New Zero-day Remote code execution vulnerability discovered in Microsoft Windows JScript that allows an attacker to run the arbitrary code on vulnerable installations of Microsoft Windows.

Remote code execution is the ability an attacker has to access someone else’s computing device and make changes, no matter where the device is geographically located.

JScript has a built-in error object that provides error information when an error occurs. The error object provides two useful properties: name and message.

This RCE flaw discovered in the handling of Error objects in JScript and the attacker can perform the specific actions in script.


According to ZDI, specific action leads to an attacker can cause a pointer to be reused after it has been freed. An attacker can leverage this vulnerability to execute code under the context of the current process.

In this case,  User interaction is required to Successfully exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

This Vulnerability categorized under ZDI(zero-day Initiative) 120-day Public disclosure deadline and if the vendor(Microsoft) failed to fix the vulnerability then the vulnerability will be disclosed publicly.

The researcher explained about the mitigation as Given the nature of the vulnerability the only salient mitigation strategy is to restrict interaction with the application to trusted files.

Microsoft Windows Response

01/23/18 – ZDI sent the vulnerability report to the vendor
01/23/18 – The vendor acknowledged and provided a case number
04/23/18 – The vendor replied that they were having difficulty reproducing the issue report without POC
04/24/18 – ZDI confirmed the POC was sent with the original and sent it again
05/01/18 – The vendor acknowledged receipt of the POC
05/08/18 – The vendor requested an extension
05/18/18 – ZDI replied “We have verified that we sent the POC with the original. The report will 0-day on May 29.

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BALAJI is a Former Security Researcher (Threat Research Labs) at Comodo Cybersecurity. Editor-in-Chief & Co-Founder - Cyber Security News & GBHackers On Security.


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