CVE-2020-0969: Chakra Scripting Engine Memory Corruption Vulnerability

Overview

Severity

Medium (CVSS 4.2)

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2020-Apr

Released

2020-04-14

EPSS Score

38.32% (percentile: 97.2%)

Description

A remote code execution vulnerability exists in the way that the Chakra scripting engine handles objects in memory in Microsoft Edge (HTML-based). The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerability through Microsoft Edge (HTML-based) and then convince a user to view the website. The attacker could also take advantage of compromised websites and websites that accept or host user-provided content or advertisements. These websites could contain specially crafted content that could exploit the vulnerability. The security update addresses the vulnerability by modifying how the Chakra scripting engine handles objects in memory.

Affected Products (22)

Browser

• ChakraCore
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for 32-bit Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for x64-based Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for ARM64-based Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for 32-bit Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for x64-based Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for ARM64-based Systems
• Microsoft Edge (EdgeHTML-based) on Windows Server 2019
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1909 for 32-bit Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1909 for x64-based Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1909 for ARM64-based Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for 32-bit Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for x64-based Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for ARM64-based Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for 32-bit Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for x64-based Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for ARM64-based Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 for 32-bit Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 for x64-based Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for 32-bit Systems
• Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for x64-based Systems
• Microsoft Edge (EdgeHTML-based) on Windows Server 2016

Security Updates (7)

• Release Notes
• 4550922
• 4549949
• 4549951
• 4550927
• 4550930
• 4550929

Acknowledgments

<a href="https://twitter.com/bkth_">Bruno Keith</a> Qixun Zhao of QiHoo 360 Vulcan team

Revision History

• 2020-04-14: Information published.