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Merge pull request from GHSA-4h9c-v5vg-5m6m

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This commit is contained in:
Simon Wisselink
2022-01-10 10:48:27 +01:00
committed by GitHub
parent b674cba13d
commit 28519ca00f
4 changed files with 42 additions and 12 deletions
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3
CHANGELOG.md
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@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
## [Unreleased]
### Security
- Prevent evasion of the `static_classes` security policy. This addresses CVE-2021-21408
## [3.1.42] - 2022-01-10
### Security

3
lexer/smarty_internal_templateparser.y
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@@ -758,6 +758,9 @@ value(res) ::= doublequoted_with_quotes(s). {
value(res) ::= varindexed(vi) DOUBLECOLON static_class_access(r). {
if ($this->security && $this->security->static_classes !== array()) {
$this->compiler->trigger_template_error('dynamic static class not allowed by security setting');
}
$prefixVar = $this->compiler->getNewPrefixVariable();
if (vi['var'] === '\'smarty\'') {
$this->compiler->appendPrefixCode("<?php {$prefixVar} = ". $this->compiler->compileTag('private_special_variable',array(),vi['smarty_internal_index']).';?>');

4
libs/sysplugins/smarty_internal_templateparser.php
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@@ -2837,6 +2837,10 @@ class Smarty_Internal_Templateparser
// line 765 "../smarty/lexer/smarty_internal_templateparser.y"
public function yy_r95()
{
if ($this->security && $this->security->static_classes !== array()) {
$this->compiler->trigger_template_error('dynamic static class not allowed by security setting');
}
$prefixVar = $this->compiler->getNewPrefixVariable();
if ($this->yystack[ $this->yyidx + -2 ]->minor[ 'var' ] === '\'smarty\'') {
$this->compiler->appendPrefixCode("<?php {$prefixVar} = " .

24
tests/UnitTests/SecurityTests/SecurityTest.php
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@@ -302,8 +302,6 @@ class SecurityTest extends PHPUnit_Smarty
* test not trusted PHP function
* @expectedException SmartyException
* @expectedExceptionMessage access to static class 'mysecuritystaticclass' not allowed by security setting
* @runInSeparateProcess
* @preserveGlobalState disabled
*/
public function testNotTrustedStaticClass()
{
@@ -311,6 +309,28 @@ class SecurityTest extends PHPUnit_Smarty
$this->smarty->fetch('string:{mysecuritystaticclass::square(5)}');
}
/**
* test not trusted PHP function
* @expectedException SmartyException
* @expectedExceptionMessage dynamic static class not allowed by security setting
*/
public function testNotTrustedStaticClassEval()
{
$this->smarty->security_policy->static_classes = array('null');
$this->smarty->fetch('string:{$test = "mysecuritystaticclass"}{$test::square(5)}');
}
/**
* test not trusted PHP function
* @expectedException SmartyException
* @expectedExceptionMessage dynamic static class not allowed by security setting
*/
public function testNotTrustedStaticClassSmartyVar()
{
$this->smarty->security_policy->static_classes = array('null');
$this->smarty->fetch('string:{$smarty.template_object::square(5)}');
}
public function testChangedTrustedDirectory()
{
$this->smarty->security_policy->secure_dir = array(