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-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 091093637..b19a6fb02 100644
--- a/system/core/Security.php
+++ b/system/core/Security.php
@@ -545,6 +545,14 @@ 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`\\3`',
+ $str
+ );
+
// Final clean up
// This adds a bit of extra precaution in case
// something got through the above filters
@@ -907,7 +915,7 @@ 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])
),
@@ -935,7 +943,7 @@ 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])
),