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Adding extra validation step in case of boolean-based blind (e.g. if unexpected 500 occurs)

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This commit is contained in:
Miroslav Stampar
2016-09-27 11:21:12 +02:00
parent 8994bf2dba
commit 7151df16f6
5 changed files with 34 additions and 27 deletions
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39
lib/techniques/blind/inference.py
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@@ -41,7 +41,7 @@ from lib.core.settings import INFERENCE_GREATER_CHAR
from lib.core.settings import INFERENCE_EQUALS_CHAR
from lib.core.settings import INFERENCE_NOT_EQUALS_CHAR
from lib.core.settings import MAX_BISECTION_LENGTH
from lib.core.settings import MAX_TIME_REVALIDATION_STEPS
from lib.core.settings import MAX_REVALIDATION_STEPS
from lib.core.settings import NULL
from lib.core.settings import PARTIAL_HEX_VALUE_MARKER
from lib.core.settings import PARTIAL_VALUE_MARKER
@@ -198,8 +198,7 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
def validateChar(idx, value):
"""
Used in time-based inference (in case that original and retrieved
value are not equal there will be a deliberate delay).
Used in inference - in time-based SQLi if original and retrieved value are not equal there will be a deliberate delay
"""
if "'%s'" % CHAR_INFERENCE_MARK not in payload:
@@ -264,6 +263,7 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
minChar = minValue = charTbl[0]
firstCheck = False
lastCheck = False
unexpectedCode = False
while len(charTbl) != 1:
position = None
@@ -321,6 +321,12 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
result = Request.queryPage(forgedPayload, timeBasedCompare=timeBasedCompare, raise404=False)
incrementCounter(kb.technique)
if not timeBasedCompare:
unexpectedCode |= threadData.lastCode not in (kb.injection.data[kb.technique].falseCode, kb.injection.data[kb.technique].trueCode)
if unexpectedCode:
warnMsg = "unexpected HTTP code '%d' detected. Will use (extra) validation step in similar cases" % threadData.lastCode
singleTimeWarnMessage(warnMsg)
if result:
minValue = posValue
@@ -360,24 +366,25 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
retVal = minValue + 1
if retVal in originalTbl or (retVal == ord('\n') and CHAR_INFERENCE_MARK in payload):
if timeBasedCompare and not validateChar(idx, retVal):
if (timeBasedCompare or unexpectedCode) and not validateChar(idx, retVal):
if not kb.originalTimeDelay:
kb.originalTimeDelay = conf.timeSec
kb.timeValidCharsRun = 0
if retried < MAX_TIME_REVALIDATION_STEPS:
threadData.validationRun = 0
if retried < MAX_REVALIDATION_STEPS:
errMsg = "invalid character detected. retrying.."
logger.error(errMsg)
if kb.adjustTimeDelay is not ADJUST_TIME_DELAY.DISABLE:
conf.timeSec += 1
warnMsg = "increasing time delay to %d second%s " % (conf.timeSec, 's' if conf.timeSec > 1 else '')
logger.warn(warnMsg)
if timeBasedCompare:
if kb.adjustTimeDelay is not ADJUST_TIME_DELAY.DISABLE:
conf.timeSec += 1
warnMsg = "increasing time delay to %d second%s " % (conf.timeSec, 's' if conf.timeSec > 1 else '')
logger.warn(warnMsg)
if kb.adjustTimeDelay is ADJUST_TIME_DELAY.YES:
dbgMsg = "turning off time auto-adjustment mechanism"
logger.debug(dbgMsg)
kb.adjustTimeDelay = ADJUST_TIME_DELAY.NO
if kb.adjustTimeDelay is ADJUST_TIME_DELAY.YES:
dbgMsg = "turning off time auto-adjustment mechanism"
logger.debug(dbgMsg)
kb.adjustTimeDelay = ADJUST_TIME_DELAY.NO
return getChar(idx, originalTbl, continuousOrder, expand, shiftTable, (retried or 0) + 1)
else:
@@ -387,8 +394,8 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
return decodeIntToUnicode(retVal)
else:
if timeBasedCompare:
kb.timeValidCharsRun += 1
if kb.adjustTimeDelay is ADJUST_TIME_DELAY.NO and kb.timeValidCharsRun > VALID_TIME_CHARS_RUN_THRESHOLD:
threadData.validationRun += 1
if kb.adjustTimeDelay is ADJUST_TIME_DELAY.NO and threadData.validationRun > VALID_TIME_CHARS_RUN_THRESHOLD:
dbgMsg = "turning back on time auto-adjustment mechanism"
logger.debug(dbgMsg)
kb.adjustTimeDelay = ADJUST_TIME_DELAY.YES