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adding filtering of strings for control chars in blind inference mode (way to handle either errornous values, or either binary data)

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This commit is contained in:
Miroslav Stampar 2011-01-05 10:25:07 +00:00
parent c83e9f6ca5
commit 7ae5192070
3 changed files with 14 additions and 5 deletions
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8
lib/core/common.py
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@ -61,6 +61,7 @@ from lib.core.settings import IS_WIN
from lib.core.settings import PLATFORM from lib.core.settings import PLATFORM
from lib.core.settings import SITE from lib.core.settings import SITE
from lib.core.settings import ERROR_PARSING_REGEXES from lib.core.settings import ERROR_PARSING_REGEXES
from lib.core.settings import NON_CONTROL_CHAR_REGEX
from lib.core.settings import SQL_STATEMENTS from lib.core.settings import SQL_STATEMENTS
from lib.core.settings import SUPPORTED_DBMS from lib.core.settings import SUPPORTED_DBMS
from lib.core.settings import UNKNOWN_DBMS_VERSION from lib.core.settings import UNKNOWN_DBMS_VERSION
@ -1823,6 +1824,13 @@ def filterStringValue(value, regex, replace=None):
return retVal return retVal
def filterControlChars(value):
"""
Returns string value with control
chars being supstituted with ' '
"""
return filterStringValue(output, NON_CONTROL_CHAR_REGEX, ' ')
def isDBMSVersionAtLeast(version): def isDBMSVersionAtLeast(version):
""" """
Checks if the recognized DBMS version Checks if the recognized DBMS version

2
lib/core/settings.py
View File

@ -52,7 +52,7 @@ DUMP_STOP_MARKER = "__STOP__"
PAYLOAD_DELIMITER = "\x00" PAYLOAD_DELIMITER = "\x00"
CHAR_INFERENCE_MARK = "%c" CHAR_INFERENCE_MARK = "%c"
READABLE_CHAR_REGEX = r'[\ -~]' NON_CONTROL_CHAR_REGEX = r'[^\x00-\x1f]'
# coefficient used for a time-based query delay checking (must be >= 7) # coefficient used for a time-based query delay checking (must be >= 7)
TIME_STDEV_COEFF = 10 TIME_STDEV_COEFF = 10

9
lib/techniques/blind/inference.py
View File

@ -14,6 +14,7 @@ import traceback
from lib.core.agent import agent from lib.core.agent import agent
from lib.core.common import dataToSessionFile from lib.core.common import dataToSessionFile
from lib.core.common import dataToStdout from lib.core.common import dataToStdout
from lib.core.common import filterControlChars
from lib.core.common import getCharset from lib.core.common import getCharset
from lib.core.common import goGoodSamaritan from lib.core.common import goGoodSamaritan
from lib.core.common import getPartRun from lib.core.common import getPartRun
@ -324,7 +325,7 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
output += status if count != length else " "*len(status) output += status if count != length else " "*len(status)
iolock.acquire() iolock.acquire()
dataToStdout("\r[%s] [INFO] retrieved: %s" % (time.strftime("%X"), replaceNewlineTabs(output, stdout=True))) dataToStdout("\r[%s] [INFO] retrieved: %s" % (time.strftime("%X"), filterControlChars(output)))
iolock.release() iolock.release()
if not kb.threadContinue: if not kb.threadContinue:
@ -394,10 +395,10 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
if partialValue: if partialValue:
finalValue = partialValue finalValue = partialValue
infoMsg = "\r[%s] [INFO] partially retrieved: %s" % (time.strftime("%X"), finalValue) infoMsg = "\r[%s] [INFO] partially retrieved: %s" % (time.strftime("%X"), filterControlChars(finalValue))
else: else:
finalValue = "".join(value) finalValue = "".join(value)
infoMsg = "\r[%s] [INFO] retrieved: %s" % (time.strftime("%X"), finalValue) infoMsg = "\r[%s] [INFO] retrieved: %s" % (time.strftime("%X"), filterControlChars(finalValue))
if isinstance(finalValue, basestring) and len(finalValue) > 0: if isinstance(finalValue, basestring) and len(finalValue) > 0:
dataToSessionFile(replaceNewlineTabs(finalValue)) dataToSessionFile(replaceNewlineTabs(finalValue))
@ -499,7 +500,7 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
dataToStdout("\n") dataToStdout("\n")
if ( conf.verbose in ( 1, 2 ) and showEta ) or conf.verbose >= 3: if ( conf.verbose in ( 1, 2 ) and showEta ) or conf.verbose >= 3:
infoMsg = "retrieved: %s" % finalValue infoMsg = "retrieved: %s" % filterControlChars(finalValue)
logger.info(infoMsg) logger.info(infoMsg)
if not partialValue: if not partialValue: