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refactor: create 941190 .ra file #4499

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Merged
fzipi merged 2 commits into from
Mar 2, 2026
Merged

refactor: create 941190 .ra file #4499

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e9a62b9
refactor: create 941190 `.ra` file
fzipi Mar 1, 2026
570a8ed
Merge branch 'main' into regex-assembly/941190
fzipi Mar 2, 2026
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65 changes: 65 additions & 0 deletions regex-assembly/941190.ra
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Original file line number Diff line number Diff line change
@@ -0,0 +1,65 @@
##! Please refer to the documentation at
##! https://coreruleset.org/docs/development/regex_assembly/.

##! IE XSS Filters - detects XSS within <style> tags.
##! Matches a style tag followed by either:
##! - a CSS at-rule (@i or @\)
##! - a colon/equals (or HTML entity equivalent) followed by
##! a paren/backslash (or HTML entity equivalent)

##!+ i

##! HTML entity codes for colon (:) and equals (=)
##! 58 = ':' decimal, 3A = ':' hex, 61 = '=' decimal, 3D = '=' hex
##!> assemble
58
3A
61
3D
##!=< colon-equals-entity-codes
##!<

##! HTML entity codes for open paren and backslash
##! 40 = '(' decimal, 28 = '(' hex, 92 = '\' decimal, 5C = '\' hex
##!> assemble
40
28
92
5C
##!=< paren-backslash-entity-codes
##!<

##! colon or equals, literal or as HTML entity
##!> assemble
[:=]
##!> assemble
&#x?0*
##!=> colon-equals-entity-codes
;?
##!<
##!=< colon-or-equals
##!<

##! open paren or backslash, literal or as HTML entity
##!> assemble
[(\x5c]
##!> assemble
&#x?0*
##!=> paren-backslash-entity-codes
;?
##!<
##!=< paren-or-backslash
##!<

##! CSS at-rule pattern: @i or @\
##!> assemble
<style.*?>.*?@[i\x5c]
##!<

##! assignment pattern: colon/equals ... paren/backslash
##!> assemble
<style.*?>.*?
##!=> colon-or-equals
.*?
##!=> paren-or-backslash
##!<
7 changes: 6 additions & 1 deletion rules/REQUEST-941-APPLICATION-ATTACK-XSS.conf
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Expand Up @@ -322,7 +322,12 @@ SecRule REQUEST_COOKIES|REQUEST_COOKIES_NAMES|ARGS_NAMES|ARGS|REQUEST_FILENAME|X
# Ref: http://blogs.technet.com/srd/archive/2008/08/18/ie-8-xss-filter-architecture-implementation.aspx
# Ref: http://xss.cx/examples/ie/internet-exploror-ie9-xss-filter-rules-example-regexp-mshtmldll.txt
#
SecRule REQUEST_COOKIES|REQUEST_COOKIES_NAMES|ARGS_NAMES|ARGS|REQUEST_FILENAME|XML:/* "@rx (?i:<style.*?>.*?(?:@[i\x5c]|(?:[:=]|&#x?0*(?:58|3A|61|3D);?).*?(?:[(\x5c]|&#x?0*(?:40|28|92|5C);?)))" \
# Regular expression generated from regex-assembly/941190.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 941190
#
SecRule REQUEST_COOKIES|REQUEST_COOKIES_NAMES|ARGS_NAMES|ARGS|REQUEST_FILENAME|XML:/* "@rx (?i)<style.*?>.*?(?:@[\x5ci]|(?:[:=]|&#x?0*(?:58|3[AD]|61);?).*?(?:[\(\x5c]|&#x?0*(?:40|28|92|5C);?))" \
"id:941190,\
phase:2,\
block,\
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