Please run windows update now

Royce Williams royce at techsolvency.com
Mon May 15 21:06:09 UTC 2017


On Fri, May 12, 2017 at 10:30 AM, Royce Williams <royce at techsolvency.com>
wrote:

> My $0.02, for people doing internal/private triage:
>
> - If your use of IPv4 space is sparse by routes, dump your internal
> routing table and convert to summarized CIDR.
>
> - Feed your CIDRs to masscan [1] to scan for internal port 445 (masscan
> randomizes targets, so destination office WAN links won't saturate, but
> local/intermediate might if you're not careful, so tune):
>
>     sudo masscan -p445 --rate=[packets-per-second safe for your network]
> -iL routes.list -oG masscan-445.out
>
> - Use https://github.com/RiskSense-Ops/MS17-010/tree/master/scanners (the
> python2 one, or the Metasploit one if you can use that internally) to
> detect vuln. the python one is not* a parallelized script, so consider
> breaking it into multiple parallel runners if you have a lot of scale.
>

Note - I've learned that the detection rate for the Python script above is
*much* lower than this nmap script. I recommend using the nmap script
instead:

https://github.com/cldrn/nmap-nse-scripts/blob/master/scripts/smb-vuln-ms17-010.nse



> - If you're using SCCM/other, verify that MS17-010 was applied - but be
> mindful of Windows-based appliances not centrally patched, etc. Trust but
> verify.
>
> - In parallel, consider investigating low-hanging fruit by OU
> (workstations?) to disable SMBv1 entirely.
>
> Royce
>
> 1. https://github.com/robertdavidgraham/masscan
>
>


More information about the NANOG mailing list