Re: Using AdjustTokenPrivileges via Meterpreter Railgun

[Rob Fuller <mubix () room362 com>]

The only way I know to make structs is to create them in ruby, byte for
bytes, get a size and write them to memory, then point what needs the
struct at that memory space (keeping in mind endianess)

Chao-mu was working on an automated way to do this but I don't think he
finished it. I do believe others have done this in other modules too. Look
for any write memory stuff in the post modules section.


--
Rob Fuller | Mubix
Certified Checkbox Unchecker
Room362.com | Hak5.org


On Mon, Jan 7, 2013 at 3:45 PM, Spencer, Shelby C
<Shelby_C_Spencer () rl gov>wrote:

> Hi,****
>
> ** **
>
> I’m trying to add a couple token privilege to the current process
> Meterpreter is running under like so:****
>
> ** **
>
> hcurrent = client.railgun.kernel32.GetCurrentProcess****
>
> hcurrentToken =
> client.railgun.advapi32.OpenProcessToken(hcurrent["return"], 40, 4) ****
>
> SeIncreaseQuotaPrivilege =
> client.railgun.advapi32.LookupPrivilegeValueW(nil,
> "SeIncreaseQuotaPrivilege", 4)****
>
> SeAssignPrimaryTokenPrivilege =
> client.railgun.advapi32.LookupPrivilegeValueW(nil,
> "SeAssignPrimaryTokenPrivilege", 4)****
>
> client.railgun.advapi32.AdjustTokenPrivileges(hcurrentToken["TokenHandle"],
> false, <PTOKEN_PRIVILEGES Struct Here>, 0, nil, nil)****
>
> ** **
>
> According to the MSDN documentation on AdjustTokenPrivileges (
> http://msdn.microsoft.com/en-us/library/windows/desktop/aa375202%28v=vs.85%29.aspx),
> the PTOKEN_PRIVILEGES struct should look something like this:****
>
> privileges = {"PrivilegeCount" => 2, "Privileges" => [{"Luid" =>
> SeIncreaseQuotaPrivilege["lpLuid"], "Attributes" => 2}, {"Luid" =>
> SeIncreaseQuotaPrivilege["lpLuid"], "Attributes" => 2}]} #Ruby syntax****
>
> ** **
>
> Obviously this complicated struct needs to be packed somehow using Ruby’s
> “pack” command, but the problem is that I have no idea how to begin.  I
> can’t find any documentation or any other modules which do anything
> similarly complex.****
>
> The closest code I found was in Metasm source:
> https://github.com/rapid7/metasploit-framework/blob/master/lib/metasm/metasm/os/windows.rb
> ****
>
> I couldn’t seem to figure out how to translate this to my method using
> Railgun, or call the Metasm module and methods in that file directly.****
>
> ** **
>
> I’m sure this is probably pretty simple, I just need a little guidance.***
> *
>
> ** **
>
> Thanks in advance,****
>
> shellster****
>
> ** **
>
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