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minor improvement ("quick defense against substr fields")

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This commit is contained in:
Miroslav Stampar 2011-03-31 09:35:09 +00:00
parent ce51326bff
commit c5de903eab
2 changed files with 6 additions and 2 deletions
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3
lib/core/settings.py
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@ -66,6 +66,9 @@ CONCAT_VALUE_DELIMITER = '|'
# 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
# minimum length of usable union injected response (quick defense against substr fields)
UNION_MIN_RESPONSE_CHARS = 10
# coefficient used for a union-based number of columns checking (must be >= 7) # coefficient used for a union-based number of columns checking (must be >= 7)
UNION_STDEV_COEFF = 7 UNION_STDEV_COEFF = 7

5
lib/techniques/inband/union/test.py
View File

@ -32,6 +32,7 @@ from lib.core.data import queries
from lib.core.enums import DBMS from lib.core.enums import DBMS
from lib.core.enums import PAYLOAD from lib.core.enums import PAYLOAD
from lib.core.settings import FROM_TABLE from lib.core.settings import FROM_TABLE
from lib.core.settings import UNION_MIN_RESPONSE_CHARS
from lib.core.settings import UNION_STDEV_COEFF from lib.core.settings import UNION_STDEV_COEFF
from lib.core.settings import MIN_RATIO from lib.core.settings import MIN_RATIO
from lib.core.settings import MAX_RATIO from lib.core.settings import MAX_RATIO
@ -113,7 +114,7 @@ def __unionPosition(comment, place, parameter, value, prefix, suffix, count, whe
# affected by an exploitable inband SQL injection vulnerability # affected by an exploitable inband SQL injection vulnerability
for position in positions: for position in positions:
# Prepare expression with delimiters # Prepare expression with delimiters
randQuery = randomStr() randQuery = randomStr(UNION_MIN_RESPONSE_CHARS)
phrase = "%s%s%s".lower() % (kb.misc.start, randQuery, kb.misc.stop) phrase = "%s%s%s".lower() % (kb.misc.start, randQuery, kb.misc.stop)
randQueryProcessed = agent.concatQuery("\'%s\'" % randQuery) randQueryProcessed = agent.concatQuery("\'%s\'" % randQuery)
randQueryUnescaped = unescaper.unescape(randQueryProcessed) randQueryUnescaped = unescaper.unescape(randQueryProcessed)
@ -134,7 +135,7 @@ def __unionPosition(comment, place, parameter, value, prefix, suffix, count, whe
if where == PAYLOAD.WHERE.ORIGINAL: if where == PAYLOAD.WHERE.ORIGINAL:
# Prepare expression with delimiters # Prepare expression with delimiters
randQuery2 = randomStr() randQuery2 = randomStr(UNION_MIN_RESPONSE_CHARS)
phrase2 = "%s%s%s".lower() % (kb.misc.start, randQuery2, kb.misc.stop) phrase2 = "%s%s%s".lower() % (kb.misc.start, randQuery2, kb.misc.stop)
randQueryProcessed2 = agent.concatQuery("\'%s\'" % randQuery2) randQueryProcessed2 = agent.concatQuery("\'%s\'" % randQuery2)
randQueryUnescaped2 = unescaper.unescape(randQueryProcessed2) randQueryUnescaped2 = unescaper.unescape(randQueryProcessed2)