windows verified high v1.0.0

DBUtilDrv2.sys

Dell DBUtilDrv2.sys versions 2.5, 2.6, and 2.7 all contain a write-what-where condition allowing kernel memory read/write. Dell released v2.7 as a remediation for CVE-2021-36276 but the fix was incomplete. Rapid7 confirmed v2.7 retains the kernel memory primitive and published the dellicious PoC and a Metasploit module (post/windows/manage/dell_memory_protect) that works against both v2.5 and v2.7. Dell categorized the v2.7 issue as a weakness rather than a vulnerability, stating it requires ...

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sc.exe create DBUtilDrv2.sys binPath=C:\windows\temp\DBUtilDrv2.sys type=kernel && sc.exe start DBUtilDrv2.sys
sc.exe create DBUtilDrv2.sys binPath=C:\windows\temp\DBUtilDrv2.sys type=kernel && sc.exe start DBUtilDrv2.sys

Sandbox: execFile · Timeout: 30s

Capabilities

security.privilegeescalation.kernel-exploit

Detection

TypeRule / Indicator
yara https://github.com/magicsword-io/LOLDrivers/blob/main/detections/yara/71fe5af0f1564dc187eea8d59c0fbc897712afa07d18316d2080330ba17cf009.yara
sigma https://github.com/magicsword-io/LOLDrivers/blob/main/detections/sigma/driver_load_win_vuln_drivers.yml
sigma https://github.com/magicsword-io/LOLDrivers/blob/main/detections/sigma/driver_load_win_vuln_drivers_names.yml
sysmon https://github.com/magicsword-io/LOLDrivers/blob/main/detections/sysmon/sysmon_config_vulnerable_hashes.xml
sysmon https://github.com/magicsword-io/LOLDrivers/blob/main/detections/sysmon/sysmon_config_vulnerable_hashes_block.xml
yara https://github.com/magicsword-io/LOLDrivers/blob/main/detections/yara/yara-rules_vuln_drivers_strict_renamed.yar
sigma https://github.com/magicsword-io/LOLDrivers/blob/main/detections/sigma/driver_load_win_vuln_drivers.yml
sigma https://github.com/magicsword-io/LOLDrivers/blob/main/detections/sigma/driver_load_win_vuln_drivers_names.yml
sysmon https://github.com/magicsword-io/LOLDrivers/blob/main/detections/sysmon/sysmon_config_vulnerable_hashes.xml
sysmon https://github.com/magicsword-io/LOLDrivers/blob/main/detections/sysmon/sysmon_config_vulnerable_hashes_block.xml

Documentation

examples:

  • description: "Load the kernel driver" command: "sc.exe create DBUtilDrv2.sys binPath=C:\\windows\\temp\\DBUtilDrv2.sys type=kernel && sc.exe start DBUtilDrv2.sys"
  • description: "Exploit the driver for privilege escalation" command: "Exploit.exe --driver DBUtilDrv2.sys"

DBUtilDrv2.sys

Dell DBUtilDrv2.sys versions 2.5, 2.6, and 2.7 all contain a write-what-where condition allowing kernel memory read/write. Dell released v2.7 as a remediation for CVE-2021-36276 but the fix was incomplete. Rapid7 confirmed v2.7 retains the kernel memory primitive and published the dellicious PoC and a Metasploit module (post/windows/manage/dell_memory_protect) that works against both v2.5 and v2.7. Dell categorized the v2.7 issue as a weakness rather than a vulnerability, stating it requires admin privileges.

Use Case: Elevate privileges

Required Privileges: kernel

MITRE ATT&CK: T1068

References