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Files from Grant Willcox

First Active2020-05-08
Last Active2021-01-12
Cloud Filter Arbitrary File Creation / Privilege Escalation
Posted Jan 12, 2021
Authored by Grant Willcox, James Foreshaw | Site metasploit.com

This Metasploit module exploits a vulnerability in cldflt.sys. The Cloud Filter driver on Windows 10 v1803 and later, prior to the December 2020 updates, did not set the IO_FORCE_ACCESS_CHECK or OBJ_FORCE_ACCESS_CHECK flags when calling FltCreateFileEx() and FltCreateFileEx2() within its HsmpOpCreatePlaceholders() function with attacker controlled input. This meant that files were created with KernelMode permissions, thereby bypassing any security checks that would otherwise prevent a normal user from being able to create files in directories they don't have permissions to create files in. This module abuses this vulnerability to perform a DLL hijacking attack against the Microsoft Storage Spaces SMP service, which grants the attacker code execution as the NETWORK SERVICE user. Users are strongly encouraged to set the PAYLOAD option to one of the Meterpreter payloads, as doing so will allow them to subsequently escalate their new session from NETWORK SERVICE to SYSTEM by using Meterpreter's "getsystem" command to perform RPCSS Named Pipe Impersonation and impersonate the SYSTEM user.

tags | exploit, code execution
systems | windows
advisories | CVE-2020-1170, CVE-2020-17136
MD5 | a3096153d5abb79b42ddbd4fd922a273
Microsoft Windows NtUserMNDragOver Local Privilege Escalation
Posted May 8, 2020
Authored by Clement LECIGNE, timwr, Grant Willcox | Site metasploit.com

This Metasploit module exploits a NULL pointer dereference vulnerability in MNGetpItemFromIndex(), which is reachable via a NtUserMNDragOver() system call. The NULL pointer dereference occurs because the xxxMNFindWindowFromPoint() function does not effectively check the validity of the tagPOPUPMENU objects it processes before passing them on to MNGetpItemFromIndex(), where the NULL pointer dereference will occur. This module has been tested against Windows 7 x86 SP0 and SP1. Offsets within the solution may need to be adjusted to work with other versions of Windows, such as Windows Server 2008.

tags | exploit, x86
systems | windows, 7
advisories | CVE-2019-0808
MD5 | e65eeb8c736544fe952269396a557f62
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