Because http-server-header grabs the server header and sets the service
version hardmatched, Nmap won't print a service fingerprint. This means
people might not submit as many fingerprints in the future, but we would
rather they did (speeds up scans by short-circuiting version probes).
Now http-server-header will print a messages suggesting the use of
--script-args http-server-header.skip for the purposes of submitting a
fingerprint. If this script-arg is set, the script will not run,
preserving Nmap's previous behavior.
NSE scripts should not send data to stdout with print(). One exception
was not altered: url-snarf states in its documentation that urls are
sent to stdout by default, with a script-arg option to save to a file
instead.
Clean up some typos and differences. Most have been normalized to
whatever form of the name occurred in the largest number of scripts.
Paulino was contacted directly and requested his email be added to all
of his credits.
http://seclists.org/nmap-dev/2013/q3/346
For any given fingerprint from http-default-accounts-fingerprints
script http-default-accounts currently tests corresponding default
credentials if at least one of the probe URLs succeeded, namely
returned with status other than 404.
Some web servers, such as Linksys devices, respond with HTTP/401 even
for non-existent URLs. This causes the script to assume that these URLs
do exist and to test the credentials, while ideally they should be
tested only on those servers where they make sense.
The purpose of the attached patches is to reduce unnecessary credential
guessing by implementing a new optional fingerprint element, function
target_check(), which takes some already collected target information,
including a probe URL response, and returns true or false, indicating
whether the credential guessing should be attempted or not.
All of the current fingerprints have been retrofitted with simple
target validations as follows:
* If the fingerprint uses native HTTP authentication, validate that the
target's realm matches the server type.
* If the fingerprint uses form-based authentication, validate that the
probe URL returned with HTTP/200 (as opposed to perhaps HTTP/401).
When testing against the above-mentioned Linksys the difference was
notable: 14 login attempts before the patch versus 1 attempt after the
patch.
This functionality provides opportunity for further improvement by
being able to match page content to differentiate between real HTTP/200
and a custom error page. (As of now the script completely skips targets
that return HTTP/200 for non-existent pages.)
