Re: Getting a Machines Uptime Remotely

[Pete Herzog <lists () isecom org>]

Hi,

The UPTIME is from the Timestamp of a TCP packet.  If you know the OS 
you can figure out the uptime from the number of milliseconds in the 
timestamp.

Windows, however, does not provide timestamp information in TCP and 
rarely in the timestamp option of ICMP (nmap can request this as -PP).

As others said before, SNMP, NNTP, and RPC are options.  Other services 
may also give you local time (often times in GMT though) that will let 
you know its time but not its uptime.  Therefore, you will have to do a 
little deductive work to narrow in.  For example, if automatic 
Windowsupdate is used then you can look correspond patches with release 
dates knowing that often a reboot is performed after the patch is 
applied.  Windows update may not be automatic which means you need to 
know an update schedule or maybe it's not updated at all ever which 
means you really can't use that as a guage.

But if you just need to settle a bet, there's always a few tricks to 
BSOD the system and then you make your own UPTIME calculation ;)  Just 
kidding.

There may be other tricks but you'll have to google for it.  AFAIK, 
without researching for you, there are easy ways to get the local time 
but not the uptime.

Sincerely,
-pete.

www.isestorm.org

Holstein, Robert - BLS CTR wrote:
> I should have mentioned this in the first communiqué.  I don't have any privileges on any of the remote workstations to authenticate a remote connection with so RPC queries usually don't work. If someone knows a way to coax something from an RPC call im all ears.  Having no credentials to pass also eliminates psinfo, systeminfo, uptime or many of the other well know windows based tools.  
>
> SNMP is supposedly completely disabled on these workstations so I don't know if trying to query an OID remotely would be worth the 
> time. It's worth a try though.   That's one of the reasons I looked to NMAP.  I know it calculates uptime from the TCP timestamp 
> for Linux OS.  I suspect it can do the same for windows, but I don't know how to go about it.
>
>
> -----Original Message-----
> From: Steve Friedl [mailto:steve () unixwiz net] 
> Sent: Thursday, February 02, 2006 2:21 PM
> To: Holstein, Robert - BLS CTR
> Cc: pen-test () securityfocus com
> Subject: Re: Getting a Machines Uptime Remotely
>
> On Wed, Feb 01, 2006 at 10:18:06AM -0500, Holstein, Robert - BLS CTR wrote:
> > I'm trying to figure out how to get the uptime of a Win* machine 
> > remotely using NMAP.  Stealth is not a concern.  I've done it with 
> > *nix based OS'es before using NMAP but never Windows. Can anyone offer 
> > some advice on how to do this using NMAP.  I've tried a couple 
> > different things with no results.
>
> There are two ways I can think of to get the uptime remotely, though neither with nmap.
>
> 1) via SNMP: the sysUpTime.0 OID is the number of 100ths of a second since
>    boot. This has a 497-day limit before the 32-bit counter wraps around,
>    but if it's a Windows machine I doubt you'll run into that ;-)
>
> 2) I'm sure there's an RPC type query which returns this information, but
>    it surely requires a network credential.
>
> Steve
>
> --- 
> Stephen J Friedl | Security Consultant |  UNIX Wizard  |   +1 714 544-6561
> www.unixwiz.net  | Tustin, Calif. USA  | Microsoft MVP | steve () unixwiz net
>
>
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