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Patch for known NCHAR/UNION-query SQLi problems

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This commit is contained in:
Miroslav Stampar
2020-12-01 12:16:15 +01:00
parent c6557e2b45
commit 78ba33737e
4 changed files with 13 additions and 1 deletions
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8
lib/techniques/union/use.py
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@@ -157,12 +157,20 @@ def _oneShotUnionUse(expression, unpack=True, limited=False):
warnMsg += "(probably due to its length and/or content): "
warnMsg += safecharencode(trimmed)
logger.warn(warnMsg)
elif re.search(r"ORDER BY [^ ]+\Z", expression):
debugMsg = "retrying failed SQL query without the ORDER BY clause"
singleTimeDebugMessage(debugMsg)
expression = re.sub(r"\s*ORDER BY [^ ]+\Z", "", expression)
retVal = _oneShotUnionUse(expression, unpack, limited)
elif kb.nchar and re.search(r" AS N(CHAR|VARCHAR)", agent.nullAndCastField(expression)):
debugMsg = "turning off NATIONAL CHARACTER casting" # NOTE: in some cases there are "known" incompatibilities between original columns and NCHAR (e.g. http://testphp.vulnweb.com/artists.php?artist=1)
singleTimeDebugMessage(debugMsg)
kb.nchar = False
retVal = _oneShotUnionUse(expression, unpack, limited)
else:
vector = kb.injection.data[PAYLOAD.TECHNIQUE.UNION].vector
kb.unionDuplicates = vector[7]