Re: Error in http.lua's chunked encoding

[Joao Correa <joao () livewire com br>]

Ron,

Would you mind sending the output of a scan with -d3?

Thanks,
Joao

On Mon, Aug 17, 2009 at 11:30 PM, Ron<ron () skullsecurity net> wrote:
> Hmm, that didn't fix it for me, although it did change the error. I now get:
>
> ./nselib/http.lua:164: Didn't find CRLF after chunk-size [ chunk-extension ]
> at position 2; got "OF\
> ".
> stack traceback:
>        [C]: in function 'error'
>        ./nselib/http.lua:164: in function '(for generator)'
>        ./nselib/http.lua:834: in function 'parseResult'
>        ./nselib/http.lua:682: in function 'pipeline'
>        ./scripts/http-enum.nse:169: in function <./scripts/http-enum.nse:42>
>        (tail call): ?
>
>
> Sorry for not looking into this myself. :)
>
> On 08/17/2009 09:24 PM, Joao Correa wrote:
> > Hi Ron,
> >
> > The problem happens because the request made was a HEAD request, where
> > no body exists. The following patch fixed the problem for me. Thanks!
> >
> > Joao Correa
> >
> > On Mon, Aug 17, 2009 at 10:57 PM, Ron<ron () skullsecurity net>  wrote:
> > > http.lua seems to have an issue with certain hosts. I can reliably cause
> > > an
> > > error when I scan google with http-enum.nse:
> > >
> > > -
> > > $ ./nmap --script=http-enum -p80,443 -T4 -d www.google.ca
> > >
> > > Starting Nmap 5.05BETA1 ( http://nmap.org ) at 2009-08-17 20:55 CDT
> > > --------------- Timing report ---------------
> > >  hostgroups: min 1, max 100000
> > >  rtt-timeouts: init 500, min 100, max 1250
> > >  max-scan-delay: TCP 10, UDP 1000, SCTP 10
> > >  parallelism: min 0, max 0
> > >  max-retries: 6, host-timeout: 0
> > >  min-rate: 0, max-rate: 0
> > > ---------------------------------------------
> > > NSE: Loaded 1 scripts for scanning.
> > > Warning: Hostname www.google.ca resolves to 6 IPs. Using 72.14.213.105.
> > > Initiating Ping Scan at 20:55
> > > Scanning 72.14.213.105 [2 ports]
> > > Completed Ping Scan at 20:55, 0.06s elapsed (1 total hosts)
> > > Overall sending rates: 31.58 packets / s.
> > > mass_rdns: Using DNS server 4.2.2.1
> > > mass_rdns: Using DNS server 4.2.2.2
> > > Initiating Parallel DNS resolution of 1 host. at 20:55
> > > mass_rdns: 0.12s 0/1 [#: 2, OK: 0, NX: 0, DR: 0, SF: 0, TR: 1]
> > > Completed Parallel DNS resolution of 1 host. at 20:55, 0.12s elapsed
> > > DNS resolution of 1 IPs took 0.12s. Mode: Async [#: 2, OK: 1, NX: 0, DR:
> > > 0,
> > > SF: 0, TR: 1, CN: 0]
> > > Initiating Connect Scan at 20:55
> > > Scanning pv-in-f105.google.com (72.14.213.105) [2 ports]
> > > Discovered open port 443/tcp on 72.14.213.105
> > > Discovered open port 80/tcp on 72.14.213.105
> > > Completed Connect Scan at 20:55, 0.06s elapsed (2 total ports)
> > > Overall sending rates: 31.47 packets / s.
> > > NSE: Script scanning 72.14.213.105.
> > > NSE: Starting runlevel 1 scan
> > > Initiating NSE at 20:55
> > > NSE: NSE Script Threads (2) running:
> > > NSE: Starting http-enum against 72.14.213.105:443.
> > > NSE: Starting http-enum against 72.14.213.105:80.
> > > NSE: http-enum against 72.14.213.105:80 threw an error!
> > > ./nselib/http.lua:120: Chunked encoding didn't find hex at position 1;
> > > got
> > > "".
> > > stack traceback:
> > >        [C]: in function 'error'
> > >        ./nselib/http.lua:120: in function '(for generator)'
> > >        ./nselib/http.lua:834: in function<./nselib/http.lua:783>
> > >        (tail call): ?
> > >        ./scripts/http-enum.nse:97: in
> > > function<./scripts/http-enum.nse:42>
> > >        (tail call): ?
> > >
> > > NSE: http-enum.nse: Warning: Host returned 302 and not 200 when
> > > performing
> > > HEAD.
> > > NSE: http-enum.nse: Host returns 302 instead of 404 File Not Found.
> > > NSE: Total number of pipelined requests: 41
> > > NSE: Number of requests allowed by pipeline: 40
> > > NSE: Number of received responses: 42
> > > NSE: Finished http-enum against 72.14.213.105:443.
> > > Completed NSE at 20:55, 1.57s elapsed
> > > NSE: Script Scanning completed.
> > > Host pv-in-f105.google.com (72.14.213.105) is up, received syn-ack
> > > (0.061s
> > > latency).
> > > Scanned at 2009-08-17 20:55:40 CDT for 2s
> > > Interesting ports on pv-in-f105.google.com (72.14.213.105):
> > > PORT    STATE SERVICE REASON
> > > 80/tcp  open  http    syn-ack
> > > 443/tcp open  https   syn-ack
> > > Final times for host: srtt: 61415 rttvar: 26591  to: 167779
> > >
> > > Read from .: nmap-services.
> > > Nmap done: 1 IP address (1 host up) scanned in 1.98 seconds
> > > -
> > >
> > > Hope that helps!
> > >
> > > I think I found another one, too, but I'm having trouble reproducing it.
> > > Will get back to you on that one.
> > >
> > > --
> > > Ron Bowes
> > > http://www.skullsecurity.org/
> > >
> > > _______________________________________________
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> > > http://cgi.insecure.org/mailman/listinfo/nmap-dev
> > > Archived at http://SecLists.Org
> > >
> > >
> > > ------------------------------------------------------------------------
> > >
> > >
> > > _______________________________________________
> > > Sent through the nmap-dev mailing list
> > > http://cgi.insecure.org/mailman/listinfo/nmap-dev
> > > Archived at http://SecLists.Org
>
>
> --
> Ron Bowes
> http://www.skullsecurity.org/

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