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CVE-2018-8139

Status Candidate

Overview

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Microsoft Edge, aka "Scripting Engine Memory Corruption Vulnerability." This affects Microsoft Edge, ChakraCore. This CVE ID is unique from CVE-2018-0945, CVE-2018-0946, CVE-2018-0951, CVE-2018-0953, CVE-2018-0954, CVE-2018-0955, CVE-2018-1022, CVE-2018-8114, CVE-2018-8122, CVE-2018-8128, CVE-2018-8137.

Related Files

Microsoft Edge Chakra JIT BoundFunction::NewInstance Bug
Posted Jul 12, 2018
Authored by Google Security Research, lokihardt

Microsoft Edge Chakra JIT suffers from a bug. BoundFunction::NewInstance is used to handle calls to a bound function. The method first allocates a new argument array and copies the prepended arguments and others into the new argument array and calls the actual function. The problem is, it doesn't care about the CallFlags_NewTarget flag which indicates that there's an extra argument (new.target) at the end of the argument array. So the size of the new argument array created with the CallFlags_NewTarget flag will be always 1 less then required, this leads to an out-of-bounds read.

tags | exploit
advisories | CVE-2018-8139
MD5 | 2e11fd2e309888dfb033653d982fdc23
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