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authorAndrey Andreev <narf@devilix.net>2018-03-10 01:40:22 +0100
committerAndrey Andreev <narf@devilix.net>2018-03-10 01:40:22 +0100
commit3d204b63df199c7fb41d2602867ac3835776f40a (patch)
tree85019b6ebff50dec0a4353d1d1e75348196f5f2d /system/core/Security.php
parentdc1d71cea3ef0dc35fabdcebbaca6e333051aa40 (diff)
[ci skip] Fix #5420
Diffstat (limited to 'system/core/Security.php')
-rw-r--r--system/core/Security.php12
1 files changed, 10 insertions, 2 deletions
diff --git a/system/core/Security.php b/system/core/Security.php
index 6cdce5d98..89a94c3dd 100644
--- a/system/core/Security.php
+++ b/system/core/Security.php
@@ -542,6 +542,14 @@ class CI_Security {
$str
);
+ // Same thing, but for "tag functions" (e.g. eval`some code`)
+ // See https://github.com/bcit-ci/CodeIgniter/issues/5420
+ $str = preg_replace(
+ '#(alert|prompt|confirm|cmd|passthru|eval|exec|expression|system|fopen|fsockopen|file|file_get_contents|readfile|unlink)(\s*)`(.*?)`#si',
+ '\\1\\2&#96;\\3&#96;',
+ $str
+ );
+
// Final clean up
// This adds a bit of extra precaution in case
// something got through the above filters
@@ -927,7 +935,7 @@ class CI_Security {
return str_replace(
$match[1],
preg_replace(
- '#href=.*?(?:(?:alert|prompt|confirm)(?:\(|&\#40;)|javascript:|livescript:|mocha:|charset=|window\.|document\.|\.cookie|<script|<xss|d\s*a\s*t\s*a\s*:)#si',
+ '#href=.*?(?:(?:alert|prompt|confirm)(?:\(|&\#40;|`|&\#96;)|javascript:|livescript:|mocha:|charset=|window\.|document\.|\.cookie|<script|<xss|d\s*a\s*t\s*a\s*:)#si',
'',
$this->_filter_attributes($match[1])
),
@@ -955,7 +963,7 @@ class CI_Security {
return str_replace(
$match[1],
preg_replace(
- '#src=.*?(?:(?:alert|prompt|confirm|eval)(?:\(|&\#40;)|javascript:|livescript:|mocha:|charset=|window\.|document\.|\.cookie|<script|<xss|base64\s*,)#si',
+ '#src=.*?(?:(?:alert|prompt|confirm|eval)(?:\(|&\#40;|`|&\#96;)|javascript:|livescript:|mocha:|charset=|window\.|document\.|\.cookie|<script|<xss|base64\s*,)#si',
'',
$this->_filter_attributes($match[1])
),