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major improvement of ERROR data retrieval on MSSQL

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This commit is contained in:
Miroslav Stampar 2011-05-03 13:25:20 +00:00
parent 2a7838928e
commit 742b0ef76e
2 changed files with 13 additions and 4 deletions
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3
lib/core/settings.py
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@ -295,6 +295,9 @@ URI_INJECTION_MARK_CHAR = '*'
# Maximum length used for retrieving data over MySQL error based payload due to "known" problems with longer result strings
MYSQL_ERROR_CHUNK_LENGTH = 50
# Maximum length used for retrieving data over MSSQL error based payload due to trimming problems with longer result strings
MSSQL_ERROR_CHUNK_LENGTH = 100
# Do not unescape the injected statement if it contains any of the following SQL words
EXCLUDE_UNESCAPE = ("WAITFOR DELAY ", " INTO DUMPFILE ", " INTO OUTFILE ", "CREATE ", "BULK ", "EXEC ", "RECONFIGURE ", "DECLARE ", CHAR_INFERENCE_MARK)

14
lib/techniques/error/use.py
View File

@ -35,6 +35,7 @@ from lib.core.enums import PAYLOAD
from lib.core.exception import sqlmapConnectionException
from lib.core.settings import FROM_TABLE
from lib.core.settings import MYSQL_ERROR_CHUNK_LENGTH
from lib.core.settings import MSSQL_ERROR_CHUNK_LENGTH
from lib.core.settings import TURN_OFF_RESUME_INFO_LIMIT
from lib.core.threads import getCurrentThreadData
from lib.core.unescaper import unescaper
@ -50,6 +51,7 @@ def __oneShotErrorUse(expression, field):
retVal = None
offset = 1
chunk_length = None
while True:
check = "%s(?P<result>.*?)%s" % (kb.misc.start, kb.misc.stop)
@ -58,7 +60,11 @@ def __oneShotErrorUse(expression, field):
nulledCastedField = agent.nullAndCastField(field)
if Backend.isDbms(DBMS.MYSQL):
nulledCastedField = queries[DBMS.MYSQL].substring.query % (nulledCastedField, offset, MYSQL_ERROR_CHUNK_LENGTH)
chunk_length = MYSQL_ERROR_CHUNK_LENGTH
nulledCastedField = queries[DBMS.MYSQL].substring.query % (nulledCastedField, offset, chunk_length)
elif Backend.isDbms(DBMS.MSSQL):
chunk_length = MSSQL_ERROR_CHUNK_LENGTH
nulledCastedField = queries[DBMS.MSSQL].substring.query % (nulledCastedField, offset, chunk_length)
# Forge the error-based SQL injection request
vector = kb.injection.data[PAYLOAD.TECHNIQUE.ERROR].vector
@ -101,16 +107,16 @@ def __oneShotErrorUse(expression, field):
if isinstance(output, basestring):
output = htmlunescape(output).replace("<br>", "\n")
if Backend.isDbms(DBMS.MYSQL):
if any(map(lambda dbms: Backend.isDbms(dbms), [DBMS.MYSQL, DBMS.MSSQL])):
if offset == 1:
retVal = output
else:
retVal += output if output else ''
if not (output and len(output) == MYSQL_ERROR_CHUNK_LENGTH):
if not (output and len(output) == chunk_length):
break
else:
offset += MYSQL_ERROR_CHUNK_LENGTH
offset += chunk_length
else:
retVal = output
break