CVE-2018-8505

Chakra Scripting Engine Memory Corruption Vulnerability

CVE-2018-8505 is fixed in 13 products on 1 platform, first by KB4462917, released October 9, 2018. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

Urgent
CVSS
4.2
Critical
Exploitation
More likely
Vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.1423
96th percentile

<p>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.</p> <p>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.</p> <p>The security update addresses the vulnerability by modifying how the Chakra scripting engine handles objects in memory.</p>

Where it's fixed

ProductFixed inFixReleased
Microsoft
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for 32-bit Systems 14393.2551 KB4462917 Oct 9, 2018
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for x64-based Systems 14393.2551 KB4462917 Oct 9, 2018
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for 32-bit Systems 15063.1387 KB4462937 Oct 9, 2018
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for x64-based Systems 15063.1387 KB4462937 Oct 9, 2018
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for 32-bit Systems 16299.726 KB4462918 Oct 9, 2018
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for x64-based Systems 16299.726 KB4462918 Oct 9, 2018
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for 32-bit Systems 17134.345 KB4462919 Oct 9, 2018
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for x64-based Systems 17134.345 KB4462919 Oct 9, 2018
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for 32-bit Systems 17763.55 KB4464330 Oct 9, 2018
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for ARM64-based Systems 17763.55 KB4464330 Oct 9, 2018
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for x64-based Systems 17763.55 KB4464330 Oct 9, 2018
Microsoft Edge (EdgeHTML-based) on Windows Server 2016 14393.2551 KB4462917 Oct 9, 2018
Microsoft Edge (EdgeHTML-based) on Windows Server 2019 17763.55 KB4464330 Oct 9, 2018