Facebook Google Plus Twitter LinkedIn YouTube RSS Menu Search Resource - BlogResource - WebinarResource - ReportResource - Eventicons_066 icons_067icons_068icons_069icons_070

Tenable Blog

Subscribe

CVE-2019-1367: Critical Internet Explorer Memory Corruption Vulnerability Exploited In The Wild

Zero-day memory corruption vulnerability in Internet Explorer has been observed in attacks in the wild

Background

On September 23, Microsoft released an out-of-band patch for a zero-day vulnerability in Internet Explorer that has been exploited in the wild.

Analysis

CVE-2019-1367 is a memory corruption vulnerability in Internet Explorer’s scripting engine in the way that objects in memory are handled. Exploitation of this vulnerability could result in the attacker gaining arbitrary code execution under the same privileges as the current user. In the event that the current user has administrative privileges, an attacker could perform various actions on the system, from creating a new account with full privileges to installing programs or even modifying data.

To exploit the vulnerability, an attacker would have to host the exploit on a malicious website and socially engineer a user into opening that website in Internet Explorer. In the case of a targeted attack, an attacker could include a link to the malicious website in an email or in a malicious email attachment (HTML file, PDF file, Microsoft Office document) that supports embedding the scripting engine content.

The vulnerability was discovered by Clément Lecigne of Google’s Threat Analysis Group (TAG). Earlier this year, Lecigne discovered and reported two zero-day vulnerabilities: a use-after-free vulnerability in Google Chrome (CVE-2019-5786) and an elevation of privilege vulnerability in Microsoft Windows (CVE-2019-0808) that were exploited together in the wild.

Additional details about the in-the-wild exploitation of this vulnerability have not yet been made public by Lecigne and Google’s TAG, though we anticipate such details will be disclosed in a blog post in the near future.

Proof of concept

At the time this blog was published, no proof-of-concept (PoC) was available.

Solution

Microsoft released an out-of-band patch for this vulnerability due to the report that it has been exploited in the wild. Please refer to the Security Updates section for additional information on the IE Cumulative Update or relevant Security Updates.

Additionally, Microsoft has provided workarounds for both 32-bit and 64-bit systems by restricting access to the JScript.dll file. An administrator can do so by entering specific commands into the command prompt; the commands are available at the end of the security advisory page. However, these workarounds should only be used as a temporary measure until patching is feasible. Commands to revert the workarounds are also available on the Microsoft security advisory page linked above.

Identifying affected systems

A list of Tenable plugins to identify this vulnerability will appear here as they’re released.

Get more information

Join Tenable's Security Response Team on the Tenable Community.

Learn more about Tenable, the first Cyber Exposure platform for holistic management of your modern attack surface.

Get a free 60-day trial of Tenable.io Vulnerability Management.

Related Articles

Are You Vulnerable to the Latest Exploits?

Enter your email to receive the latest cyber exposure alerts in your inbox.

tenable.io

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy.

Your Tenable.io Vulnerability Management trial also includes Tenable Lumin, Tenable.io Web Application Scanning and Tenable.cs Cloud Security.

tenable.io BUY

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy. Purchase your annual subscription today.

65 assets

Choose Your Subscription Option:

Buy Now

Try Nessus Professional Free

FREE FOR 7 DAYS

Nessus® is the most comprehensive vulnerability scanner on the market today. Nessus Professional will help automate the vulnerability scanning process, save time in your compliance cycles and allow you to engage your IT team.

Buy Nessus Professional

Nessus® is the most comprehensive vulnerability scanner on the market today. Nessus Professional will help automate the vulnerability scanning process, save time in your compliance cycles and allow you to engage your IT team.

Buy a multi-year license and save. Add Advanced Support for access to phone, community and chat support 24 hours a day, 365 days a year.

Select Your License

Buy a multi-year license and save.

Add Support and Training

Tenable.io

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy.

Your Tenable.io Vulnerability Management trial also includes Tenable Lumin, Tenable.io Web Application Scanning and Tenable.cs Cloud Security.

Tenable.io BUY

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy. Purchase your annual subscription today.

65 assets

Choose Your Subscription Option:

Buy Now

Try Tenable.io Web Application Scanning

Enjoy full access to our latest web application scanning offering designed for modern applications as part of the Tenable.io platform. Safely scan your entire online portfolio for vulnerabilities with a high degree of accuracy without heavy manual effort or disruption to critical web applications. Sign up now.

Your Tenable Web Application Scanning trial also includes Tenable.io Vulnerability Management, Tenable Lumin and Tenable.cs Cloud Security.

Buy Tenable.io Web Application Scanning

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy. Purchase your annual subscription today.

5 FQDNs

$3,578

Buy Now

Try Tenable.io Container Security

Enjoy full access to the only container security offering integrated into a vulnerability management platform. Monitor container images for vulnerabilities, malware and policy violations. Integrate with continuous integration and continuous deployment (CI/CD) systems to support DevOps practices, strengthen security and support enterprise policy compliance.

Buy Tenable.io Container Security

Tenable.io Container Security seamlessly and securely enables DevOps processes by providing visibility into the security of container images – including vulnerabilities, malware and policy violations – through integration with the build process.

Try Tenable Lumin

Visualize and explore your Cyber Exposure, track risk reduction over time and benchmark against your peers with Tenable Lumin.

Your Tenable Lumin trial also includes Tenable.io Vulnerability Management, Tenable.io Web Application Scanning and Tenable.cs Cloud Security.

Buy Tenable Lumin

Contact a Sales Representative to see how Lumin can help you gain insight across your entire organization and manage cyber risk.

Try Tenable.cs

Enjoy full access to detect and fix cloud infrastructure misconfigurations and view runtime vulnerabilities. Sign up for your free trial now.

Your Tenable.cs Cloud Security trial also includes Tenable.io Vulnerability Management, Tenable Lumin and Tenable.io Web Application Scanning.

Contact a Sales Rep to Buy Tenable.cs

Contact a Sales Representative to learn more about Tenable.cs Cloud Security and see how easy it is to onboard your cloud accounts and get visibility into both cloud misconfigurations and vulnerabilities within minutes.

Try Nessus Expert Free

FREE FOR 7 DAYS

Built for the modern attack surface, Nessus Expert enables you to see more and protect your organization from vulnerabilities from IT to the cloud.

Already have Nessus Professional?
Upgrade to Nessus Expert free for 7 days.

Buy Nessus Expert

Built for the modern attack surface, Nessus Expert enables you to see more and protect your organization from vulnerabilities from IT to the cloud.

Select Your License

Promotional pricing extended until December 31st.
Buy a multi-year license and save more.

Add Support and Training