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CVE-2018-8505

CVE-2018-8505:
ChakraCore RCE Vulnerability

7.5

CVSS Score
3.0

Basic Information

CVE ID
CVE-2018-8505
GHSA ID
GHSA-p37h-rg3w-23wx
EPSS Score
0.91513%
CWE
CWE-787
Published
5/13/2022
Updated
10/6/2023
KEV Status
No
Technology
TechnologyC#

Technical Details

CVSS Vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Package NameEcosystemVulnerable VersionsFirst Patched Version
Microsoft.ChakraCorenuget< 1.11.21.11.2

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The patch adds critical missing item checks (SparseArraySegment<int32>::IsMissingItem) in two key locations: 1) In JavascriptOperators.cpp's NativeIntArray handling, where type confusion could occur during JIT optimization by accepting values that resolve to memory corruption markers. 2) In JavascriptArray.cpp's DirectSetItemAt, where debug-only assertions were insufficient protection against invalid writes in release builds. Both locations directly correspond to the CWE-787 (out-of-bounds write) description and the commit's focus on fixing type confusion in JIT operations.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

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Reasoning

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