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fix: handle multi-byte UTF-8 chars in SQL special char detection #4458

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Merged
fzipi merged 1 commit into from
Feb 17, 2026
Merged

fix: handle multi-byte UTF-8 chars in SQL special char detection #4458

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15 changes: 15 additions & 0 deletions regex-assembly/942420.ra
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@@ -0,0 +1,15 @@
##! Please refer to the documentation at
##! https://coreruleset.org/docs/development/regex_assembly/.

##! Rule 942420: Restricted SQL Character Anomaly Detection (cookies)
##! Matches when 8 or more special characters appear.
##! See: https://github.com/coreruleset/coreruleset/issues/3325

##!> include sql-special-chars-anomaly

##!^ (
##!$ {8})

##!> assemble
##!=> sql-special-chars-anomaly
##!<
16 changes: 16 additions & 0 deletions regex-assembly/942421.ra
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@@ -0,0 +1,16 @@
##! Please refer to the documentation at
##! https://coreruleset.org/docs/development/regex_assembly/.

##! Rule 942421: Restricted SQL Character Anomaly Detection (cookies)
##! Stricter sibling of rule 942420 (PL4).
##! Matches when 3 or more special characters appear.
##! See: https://github.com/coreruleset/coreruleset/issues/3325

##!> include sql-special-chars-anomaly

##!^ (
##!$ {3})

##!> assemble
##!=> sql-special-chars-anomaly
##!<
15 changes: 15 additions & 0 deletions regex-assembly/942430.ra
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##! Please refer to the documentation at
##! https://coreruleset.org/docs/development/regex_assembly/.

##! Rule 942430: Restricted SQL Character Anomaly Detection (args)
##! Matches when 12 or more special characters appear.
##! See: https://github.com/coreruleset/coreruleset/issues/3325

##!> include sql-special-chars-anomaly

##!^ (
##!$ {12})

##!> assemble
##!=> sql-special-chars-anomaly
##!<
17 changes: 17 additions & 0 deletions regex-assembly/942431.ra
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##! Please refer to the documentation at
##! https://coreruleset.org/docs/development/regex_assembly/.

##! Rule 942431: Restricted SQL Character Anomaly Detection (args)
##! Stricter sibling of rule 942430 (PL3).
##! Matches when 6 or more special characters appear.
##! Also triggered by: SAP CRM Java vulnerability CVE-2018-2380
##! See: https://github.com/coreruleset/coreruleset/issues/3325

##!> include sql-special-chars-anomaly

##!^ (
##!$ {6})

##!> assemble
##!=> sql-special-chars-anomaly
##!<
17 changes: 17 additions & 0 deletions regex-assembly/942432.ra
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##! Please refer to the documentation at
##! https://coreruleset.org/docs/development/regex_assembly/.

##! Rule 942432: Restricted SQL Character Anomaly Detection (args)
##! Stricter sibling of rule 942430 (PL4).
##! Matches when 2 or more special characters appear.
##! Also triggered by: SAP CRM Java vulnerability CVE-2018-2380
##! See: https://github.com/coreruleset/coreruleset/issues/3325

##!> include sql-special-chars-anomaly

##!^ (
##!$ {2})

##!> assemble
##!=> sql-special-chars-anomaly
##!<
38 changes: 38 additions & 0 deletions regex-assembly/include/sql-special-chars-anomaly.ra
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##! Please refer to the documentation at
##! https://coreruleset.org/docs/development/regex_assembly/.

##! Shared definitions for the SQL special character anomaly detection rules
##! (942420, 942421, 942430, 942431, 942432).
##!
##! These rules detect SQL injection attempts by counting special characters.
##!
##! UTF-8 multi-byte characters (U+00B4, U+2018, U+2019) are specified as
##! alternations outside character classes to prevent byte-by-byte matching
##! which causes false positives with non-Latin scripts.
##! See: https://github.com/coreruleset/coreruleset/issues/3325

##! ASCII special characters commonly used in SQL injection.
##!> define ascii-special [~!@#\$%\^&\*\(\)\-\+=\{\}\[\]\|:;\"'`<>]

##! Negated ASCII class (multi-byte bytes pass through as non-special)
##!> define non-special [^~!@#\$%\^&\*\(\)\-\+=\{\}\[\]\|:;\"'`<>]
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##! Special character alternation: ASCII class plus UTF-8 quote-like chars
##! U+00B4 ACUTE ACCENT -> \xC2\xB4
##! U+2018 LEFT SINGLE QUOTATION -> \xE2\x80\x98
##! U+2019 RIGHT SINGLE QUOTATION -> \xE2\x80\x99
##!> assemble
{{ascii-special}}
\xC2\xB4
\xE2\x80\x98
\xE2\x80\x99
##!=< sql-special-chars
##!<

##! Full anomaly unit: one special char followed by any non-special chars
##!> assemble
##!=> sql-special-chars
##!=>
{{non-special}}*?
##!=< sql-special-chars-anomaly
##!<
35 changes: 30 additions & 5 deletions rules/REQUEST-942-APPLICATION-ATTACK-SQLI.conf
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Expand Up @@ -1296,7 +1296,12 @@ SecRule REQUEST_COOKIES|REQUEST_COOKIES_NAMES|REQUEST_HEADERS|ARGS_NAMES|ARGS|XM
# SecRuleUpdateTargetById 942430 "!ARGS:foo"
#

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SecRule ARGS_NAMES|ARGS|XML:/* "@rx ((?:[~!@#\$%\^&\*\(\)\-\+=\{\}\[\]\|:;\"'´’‘`<>][^~!@#\$%\^&\*\(\)\-\+=\{\}\[\]\|:;\"'´’‘`<>]*?){12})" \
# Regular expression generated from regex-assembly/942430.ra.
# To update the regular expression run the following shell script
# (consult https://coreruleset.org/docs/development/regex_assembly/ for details):
# crs-toolchain regex update 942430
#
SecRule ARGS_NAMES|ARGS|XML:/* "@rx ((?:(?:[!-\+\-:->@\[\]\^`\{-~]|\x{c2}\x{b4}|\x{e2}\x80[\x98\x99])[^!-\+\-:->@\[\]\^`\{-~]*?){12})" \
"id:942430,\
phase:2,\
block,\
Expand Down Expand Up @@ -1725,7 +1730,12 @@ SecRule REQUEST_COOKIES|REQUEST_COOKIES_NAMES|ARGS_NAMES|ARGS|XML:/* "@rx [\"'`]
# SecRuleUpdateTargetById 942420 "!REQUEST_COOKIES:foo_id"
#

SecRule REQUEST_COOKIES|REQUEST_COOKIES_NAMES "@rx ((?:[~!@#\$%\^&\*\(\)\-\+=\{\}\[\]\|:;\"'´’‘`<>][^~!@#\$%\^&\*\(\)\-\+=\{\}\[\]\|:;\"'´’‘`<>]*?){8})" \
# Regular expression generated from regex-assembly/942420.ra.
# To update the regular expression run the following shell script
# (consult https://coreruleset.org/docs/development/regex_assembly/ for details):
# crs-toolchain regex update 942420
#
SecRule REQUEST_COOKIES|REQUEST_COOKIES_NAMES "@rx ((?:(?:[!-\+\-:->@\[\]\^`\{-~]|\x{c2}\x{b4}|\x{e2}\x80[\x98\x99])[^!-\+\-:->@\[\]\^`\{-~]*?){8})" \
"id:942420,\
phase:1,\
block,\
Expand Down Expand Up @@ -1754,7 +1764,12 @@ SecRule REQUEST_COOKIES|REQUEST_COOKIES_NAMES "@rx ((?:[~!@#\$%\^&\*\(\)\-\+=\{\
# [ SAP CRM Java vulnerability CVE-2018-2380 - Exploit tested: https://www.exploit-db.com/exploits/44292 ]
#

SecRule ARGS_NAMES|!ARGS_NAMES:/^[\w]+\[[\w\-]+\]\[[\w\-]*?\]$/|!ARGS_NAMES:/^[\w]+\[[\w\-]+\]\[[\w\-]+\]\[[\w\-]*?\]$/|ARGS|XML:/* "@rx ((?:[~!@#\$%\^&\*\(\)\-\+=\{\}\[\]\|:;\"'´’‘`<>][^~!@#\$%\^&\*\(\)\-\+=\{\}\[\]\|:;\"'´’‘`<>]*?){6})" \
# Regular expression generated from regex-assembly/942431.ra.
# To update the regular expression run the following shell script
# (consult https://coreruleset.org/docs/development/regex_assembly/ for details):
# crs-toolchain regex update 942431
#
SecRule ARGS_NAMES|!ARGS_NAMES:/^[\w]+\[[\w\-]+\]\[[\w\-]*?\]$/|!ARGS_NAMES:/^[\w]+\[[\w\-]+\]\[[\w\-]+\]\[[\w\-]*?\]$/|ARGS|XML:/* "@rx ((?:(?:[!-\+\-:->@\[\]\^`\{-~]|\x{c2}\x{b4}|\x{e2}\x80[\x98\x99])[^!-\+\-:->@\[\]\^`\{-~]*?){6})" \
"id:942431,\
phase:2,\
block,\
Expand Down Expand Up @@ -1907,7 +1922,12 @@ SecRule TX:DETECTION_PARANOIA_LEVEL "@lt 4" "id:942018,phase:2,pass,nolog,tag:'O
# This is a stricter sibling of rule 942420.
#

SecRule REQUEST_COOKIES|REQUEST_COOKIES_NAMES "@rx ((?:[~!@#\$%\^&\*\(\)\-\+=\{\}\[\]\|:;\"'´’‘`<>][^~!@#\$%\^&\*\(\)\-\+=\{\}\[\]\|:;\"'´’‘`<>]*?){3})" \
# Regular expression generated from regex-assembly/942421.ra.
# To update the regular expression run the following shell script
# (consult https://coreruleset.org/docs/development/regex_assembly/ for details):
# crs-toolchain regex update 942421
#
SecRule REQUEST_COOKIES|REQUEST_COOKIES_NAMES "@rx ((?:(?:[!-\+\-:->@\[\]\^`\{-~]|\x{c2}\x{b4}|\x{e2}\x80[\x98\x99])[^!-\+\-:->@\[\]\^`\{-~]*?){3})" \
"id:942421,\
phase:1,\
block,\
Expand Down Expand Up @@ -1936,7 +1956,12 @@ SecRule REQUEST_COOKIES|REQUEST_COOKIES_NAMES "@rx ((?:[~!@#\$%\^&\*\(\)\-\+=\{\
# [ SAP CRM Java vulnerability CVE-2018-2380 - Exploit tested: https://www.exploit-db.com/exploits/44292 ]
#

SecRule ARGS_NAMES|ARGS|XML:/* "@rx ((?:[~!@#\$%\^&\*\(\)\-\+=\{\}\[\]\|:;\"'´’‘`<>][^~!@#\$%\^&\*\(\)\-\+=\{\}\[\]\|:;\"'´’‘`<>]*?){2})" \
# Regular expression generated from regex-assembly/942432.ra.
# To update the regular expression run the following shell script
# (consult https://coreruleset.org/docs/development/regex_assembly/ for details):
# crs-toolchain regex update 942432
#
SecRule ARGS_NAMES|ARGS|XML:/* "@rx ((?:(?:[!-\+\-:->@\[\]\^`\{-~]|\x{c2}\x{b4}|\x{e2}\x80[\x98\x99])[^!-\+\-:->@\[\]\^`\{-~]*?){2})" \
"id:942432,\
phase:2,\
block,\
Expand Down
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