Nmap Development: Re: Error in http.lua's chunked encoding

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

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
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