BROWSER-IE Microsoft Edge JIT floating point value type confusion attempt
This event is generated when an html file containing malicious values traverses the corporate network.
Attempted Administrator Privilege Gain
CVSS base score 7.5
CVSS impact score 5.9
CVSS exploitability score 1.6
Confidentiality Impact HIGH
Integrity Impact HIGH
Availability Impact HIGH
A type confusion vulnerability has been identified in Windows Edge, that could
allow an attacker to execute arbitrary code on the targeted host.
The bug specifically occurs in the way the JIT(Just-In-Time) engine for Edge browser handles float values. In certain specific conditions , the dynamically generated JIT code fails to keep track of the type of an object when handling type conversions resulting from assigning float values to this object. This is a type confusion in chakra engine due to insufficient check when setting a float value to var array.
CVE-2018-8555: A remote code execution vulnerability exists in the way that the Chakra scripting engine handles objects in memory in Microsoft Edge, aka "Chakra Scripting Engine Memory Corruption Vulnerability." This affects Microsoft Edge, ChakraCore. This CVE ID is unique from CVE-2018-8541, CVE-2018-8542, CVE-2018-8543, CVE-2018-8551, CVE-2018-8556, CVE-2018-8557, CVE-2018-8588.
- microsoft chakracore -
- microsoft edge -
Ease of attack
- Cisco's Talos Intelligence Group