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CVE-2018-8372

CVE-2018-8372: ChakraCore RCE Vulnerability

7.5

CVSS Score
3.0

Basic Information

CVE ID
CVE-2018-8372
GHSA ID
GHSA-p349-q795-qj4q
EPSS Score
0.97697%
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< 1.10.21.10.2

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The vulnerability stemmed from improper type handling in ChakraCore's array operations. The patch replaced unsafe comparisons (InsertCompareBranch) with type-aware InsertMissingItemCompareBranch and introduced GetMissingItemOpndForAssignment/Compare to handle Float64 via uint64/uint32 bitwise checks. The BackwardPass.cpp change fixed a logic error in native array validation. These changes directly address type confusion scenarios where incorrect data types were used for memory operations, leading to exploitable memory corruption.

Vulnerable functions

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

WAF Protection Rules

WAF Rule

* r*mot* *o** *x**ution vuln*r**ility *xists in t** w*y t** s*riptin* *n*in* **n*l*s o*j**ts in m*mory in Mi*roso*t *rows*rs, *k* "S*riptin* *n*in* M*mory *orruption Vuln*r**ility." T*is *****ts ***kr**or*, Int*rn*t *xplor*r **, Mi*roso*t ****. T*is

Reasoning

T** vuln*r**ility st*mm** *rom improp*r typ* **n*lin* in ***kr**or*'s *rr*y op*r*tions. T** p*t** r*pl**** uns*** *omp*risons (`Ins*rt*omp*r**r*n**`) wit* typ*-*w*r* `Ins*rtMissin*It*m*omp*r**r*n**` *n* intro*u*** `**tMissin*It*mOpn**or*ssi*nm*nt`/`*