cbcvebase.
CVE-2017-8751
published 2017-09-13

CVE-2017-8751: Microsoft Edge in Microsoft Windows 1703 allows an attacker to execute arbitrary code in the context of the current user, due to the way that Microsoft Edge…

PriorityP264high7.5CVSS 3.0
AVNACHPRNUIRSUCHIHAH
EXPLOIT
EPSS
50.37%
98.8th percentile
Microsoft Edge in Microsoft Windows 1703 allows an attacker to execute arbitrary code in the context of the current user, due to the way that Microsoft Edge accesses objects in memory, aka "Microsoft Edge Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-8731, CVE-2017-8734, and CVE-2017-11766.

Affected

3 ranges
VendorProductVersion rangeFixed in
microsoft_corporationmicrosoft_edge
msrcmicrosoft_edge_on_windows_10_version_1703_for_32-bit_systems
msrcmicrosoft_edge_on_windows_10_version_1703_for_x64-based_systems

Detection & IOCsextracted from sources · hover to see the quote

commandObject.setPrototypeOf({}, this); location.reload();
processchakra!JsUtil::WeaklyReferencedKeyDictionary::FindEntry+0x41
  • Crash occurs in chakra.dll at JsUtil::WeaklyReferencedKeyDictionary::FindEntry during Object.setPrototypeOf execution; monitor for access violations in chakra!Js::JavascriptObject::ChangePrototype call chain
  • Exploit entry point is chakra!Js::JavascriptObject::EntrySetPrototypeOf; EDR/crash telemetry should flag abnormal call stacks rooted in this function followed by memory corruption faults
  • PoC triggers via a crafted web page; the minimal trigger is Object.setPrototypeOf({}, this) followed by location.reload() — network/proxy inspection of page content delivering this JS pattern is a viable detection vector
  • Vulnerability is in Microsoft Edge on Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016; patch KB4038788 closes the attack surface
  • ·Exploit status at time of advisory was 'Publicly Disclosed: No; Exploited: No' but rated 'Exploitation More Likely' for the latest software release — treat as high-priority patching target

CVSS provenance

nvdv3.07.5HIGHCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
nvdv2.07.6HIGHAV:N/AC:H/Au:N/C:C/I:C/A:C
vendor_msrc4.2MEDIUM
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