CVE-2018-8291 ChakraCore RCE Vulnerability

High 7.5 Published 11 Jul 2018 Updated 5 Aug 2024

Remote attackers can execute arbitrary code via memory corruption in the Microsoft scripting engine used by Edge and Internet Explorer.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2018-8291?

CVE-2018-8291 is a high-severity memory corruption vulnerability in Microsoft Chakracore, published on 11 Jul 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A remote code execution vulnerability exists in the way the scripting engine handles objects in memory in Microsoft browsers, aka "Scripting Engine Memory Corruption Vulnerability." This affects ChakraCore, Internet Explorer 11, Microsoft Edge. This CVE ID is unique from CVE-2018-8242, CVE-2018-8283, CVE-2018-8287, CVE-2018-8288, CVE-2018-8296, CVE-2018-8298.

Weakness: CWE-843

Which versions are affected by CVE-2018-8291?

2 open source packages ship an affected version, including Microsoft.ChakraCore. It affects 3 products.

Package	Affected	Fixed in
`Microsoft.ChakraCore` NuGet	All versions	`1.10.1`
`Microsoft.ChakraCore` NuGet	All versions	`1.10.1`

Products include Microsoft Chakracore, Microsoft Edge, Microsoft Internet Explorer.

How do I fix CVE-2018-8291?

Upgrade Microsoft.ChakraCore to 1.10.1 or later.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2018-8291 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-8291 exists.

Public exploit code: 1 Exploit-DB entry.

All Microsoft Chakracore vulnerabilities

Sources

Also known as GHSA-j67m-wpv6-pv44.