Tuesday, May 28, 2024

Unpatched Critical IE Browser Zero-Day Vulnerability Affected Millions of Windows Users

Microsoft issued a warning about critical IE Zero Day vulnerability that actively exploited in wide and warns millions of Windows users

A critical remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer.

Internet Explorer is one of the widely used web browsers developed by Microsoft and included in the Microsoft Windows line of operating systems, starting in 1995.

Based on the Browser Market Share report, Internet Explorer is a 3rd web browser next to Chrome and Firefox with a 7.44% market share and is used by millions of users around the world including within corporate networks. 

Successful exploitation of this IE Zero day vulnerability lets an attacker corrupt memory in such a way that it could execute arbitrary code in the context of the current user. 

An attacker could successfully exploit this vulnerability to gain the current user access, and if the user logged in as admin, an attacker could gain complete control of the vulnerable system.

In results, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

According to Microsoft advisory, “In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerability through Internet Explorer and then convince a user to view the website, for example, by sending an email.”

Affected Version:

Internet Explorer 10Windows Server 2012Remote Code ExecutionModerate
Internet Explorer 11Windows 10 Version 1803 for 32-bit SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 Version 1803 for x64-based SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 Version 1803 for ARM64-based SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 Version 1809 for 32-bit SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 Version 1809 for x64-based SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 Version 1809 for ARM64-based SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows Server 2019Remote Code ExecutionModerate
Internet Explorer 11Windows 10 Version 1909 for 32-bit SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 Version 1909 for x64-based SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 Version 1909 for ARM64-based SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 Version 1709 for 32-bit SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 Version 1709 for x64-based SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 Version 1709 for ARM64-based SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 Version 1903 for 32-bit SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 Version 1903 for x64-based SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 Version 1903 for ARM64-based SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 for 32-bit SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 for x64-based SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 Version 1607 for 32-bit SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows 10 Version 1607 for x64-based SystemsRemote Code ExecutionCritical
Internet Explorer 11Windows Server 2016Remote Code ExecutionModerate
Internet Explorer 11Windows 7 for 32-bit Systems Service Pack 1Remote Code ExecutionCritical
Internet Explorer 11Windows 7 for x64-based Systems Service Pack 1Remote Code ExecutionCritical
Internet Explorer 11Windows 8.1 for 32-bit systemsRemote Code ExecutionCritical
Internet Explorer 11Windows 8.1 for x64-based systemsRemote Code ExecutionCritical
Internet Explorer 11Windows RT 8.1Remote Code ExecutionCritical
Internet Explorer 11Windows Server 2008 R2 for x64-based Systems Service Pack 1Remote Code ExecutionModerate
Internet Explorer 11Windows Server 2012Remote Code ExecutionModerate
Internet Explorer 11Windows Server 2012 R2Remote Code ExecutionModerate
Internet Explorer 9Windows Server 2008 for 32-bit Systems Service Pack 2Remote Code ExecutionModerate
Internet Explorer 9Windows Server 2008 for x64-based Systems Service Pack 2Remote Code ExecutionModerate

Mitigation:

Currently, there is no patch available for this IE Zero Day vulnerability, Microsoft issued advisory mitigation.

Restrict access to JScript.dll

For 32-bit systems, enter the following command at an administrative command prompt:

    takeown /f %windir%\system32\jscript.dll
    cacls %windir%\system32\jscript.dll /E /P everyone:N

For 64-bit systems, enter the following command at an administrative command prompt:

    takeown /f %windir%\syswow64\jscript.dll
    cacls %windir%\syswow64\jscript.dll /E /P everyone:N
    takeown /f %windir%\system32\jscript.dll
    cacls %windir%\system32\jscript.dll /E /P everyone:N

By default, IE11, IE10, and IE9 uses Jscript9.dll which is not impacted by this vulnerability. This vulnerability only affects certain websites that utilize jscript as the scripting engine.

Microsoft working to fix the vulnerability and the security update can be expected soon the same as the other IE zero day vulnerability that fixed last year.

Website

Latest articles

Researchers Exploited Nexus Repository Using Directory Traversal Vulnerability

Hackers target and exploit GitHub repositories for a multitude of reasons and illicit purposes.The...

DDNS Service In Fortinet Or QNAP Embedded Devices Exposes Sensitive Data, Researchers Warn

Hackers employ DNS for various purposes like redirecting traffic to enable man-in-the-middle attacks, infecting...

PoC Exploit Released For macOS Privilege Escalation Vulnerability

A new vulnerability has been discovered in macOS Sonoma that is associated with privilege...

CatDDoS Exploiting 80+ Vulnerabilities, Attacking 300+ Targets Daily

Malicious traffic floods targeted systems, servers, or networks in Distributed Denial of Service (DDoS)...

GNOME Remote Desktop Vulnerability Let Attackers Read Login Credentials

GNOME desktop manager was equipped with a new feature which allowed remote users to...

Kesakode: A Remote Hash Lookup Service To Identify Malware Samples

Today marks a significant milestone for Malcat users with the release of version 0.9.6,...

Cisco Firepower Vulnerability Let Attackers Launch SQL Injection Attacks

 A critical vulnerability has been identified in Cisco Firepower Management Center (FMC) Software's web-based...
Balaji
Balaji
BALAJI is an Ex-Security Researcher (Threat Research Labs) at Comodo Cybersecurity. Editor-in-Chief & Co-Founder - Cyber Security News & GBHackers On Security.

Free Webinar

Live API Attack Simulation

94% of organizations experience security problems in production APIs, and one in five suffers a data breach. As a result, cyber-attacks on APIs increased from 35% in 2022 to 46% in 2023, and this trend continues to rise.
Key takeaways include:

  • An exploit of OWASP API Top 10 vulnerability
  • A brute force ATO (Account Takeover) attack on API
  • A DDoS attack on an API
  • Positive security model automation to prevent API attacks

Related Articles