cbcvebase.
CVE-2018-0776
published 2018-01-04

CVE-2018-0776: Microsoft Edge in Windows 10 Gold, 1511, 1607, 1703, 1709, and Windows Server 2016 allows an attacker to execute arbitrary code in the context of the current…

PriorityP271high7.5CVSS 3.0
AVNACHPRNUIRSUCHIHAH
EXPLOIT
EPSS
78.43%
99.5th percentile
Microsoft Edge in Windows 10 Gold, 1511, 1607, 1703, 1709, and Windows Server 2016 allows an attacker to execute arbitrary code in the context of the current user, due to how the scripting engine handles objects in memory, aka "Scripting Engine Memory Corruption Vulnerability". This CVE ID is unique from CVE-2018-0758, CVE-2018-0762, CVE-2018-0768, CVE-2018-0769, CVE-2018-0770, CVE-2018-0772, CVE-2018-0773, CVE-2018-0774, CVE-2018-0775, CVE-2018-0777, CVE-2018-0778, and CVE-2018-0781.

Affected

17 ranges
VendorProductVersion rangeFixed in
microsoftchakracore< 1.7.61.7.6
microsoftinternet_explorer
microsoftinternet_explorer
microsoftinternet_explorer
microsoft_corporationmicrosoft_edge
msrcchakracore
msrcmicrosoft_edge_on_windows_10_for_32-bit_systems
msrcmicrosoft_edge_on_windows_10_for_x64-based_systems
msrcmicrosoft_edge_on_windows_10_version_1511_for_32-bit_systems
msrcmicrosoft_edge_on_windows_10_version_1511_for_x64-based_systems
msrcmicrosoft_edge_on_windows_10_version_1607_for_32-bit_systems
msrcmicrosoft_edge_on_windows_10_version_1607_for_x64-based_systems
msrcmicrosoft_edge_on_windows_10_version_1703_for_32-bit_systems
msrcmicrosoft_edge_on_windows_10_version_1703_for_x64-based_systems
msrcmicrosoft_edge_on_windows_10_version_1709_for_32-bit_systems
msrcmicrosoft_edge_on_windows_10_version_1709_for_x64-based_systems
msrcmicrosoft_edge_on_windows_server_2016

Detection & IOCsextracted from sources · hover to see the quote

urlhttps://github.com/Microsoft/ChakraCore/releases/tag/v1.7.6
  • Exploit targets Microsoft Edge Chakra JIT engine via a stack-to-heap copy vulnerability triggered by BoxStackInstance methods when stack-allocated variables are copied to the heap during bailout or arguments access.
  • Exploit PoC uses a ConvertToVarArray operation on a large heap array (index 10000) to trigger the vulnerability; monitor for JIT-compiled JavaScript performing large array index writes combined with inlined function argument access.
  • Vulnerability is triggered through a specially crafted website targeting Microsoft Edge (HTML-based); monitor for drive-by download scenarios or suspicious Edge renderer process spawning child processes.
  • Exploit is publicly available on Exploit-DB (ID 43723) titled 'Microsoft Edge Chakra JIT - Stack-to-Heap Copy'; signature-based detection should cover this known PoC.
  • ·Vulnerability affects Microsoft Edge on Windows 10 1709 only; other Windows 10 versions are listed as N/A for older software release exploitation.
  • ·Exploit status is 'Exploitation More Likely' for latest software release but marked as not yet exploited in the wild at time of advisory; prioritize patching Windows 10 1709 systems.

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
CVEs like this are exactly what “Exploited This Week” covers.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.