PHP extension--taint detect hidden vulnerabilities

Brief introduction

Taint can be used to detect hidden XSS code, SQL injection, Shell injection and other vulnerabilities, and these vulnerabilities to use static analysis tools to troubleshoot, such as the following example:

<?php   echo $_GET["name"];?>

For requests:

http://localhost/?name=222

Static analysis tools, often powerless, but taint can accurately burst out of this type of problem.

Warning: Main::test() [function.echo]: Attempt to echo a string that might be tainted in

Taint Installation

wget http://pecl.php.net/get/taint-1.2.2.tgztar zxvf taint-1.2.2.tgzcd taint-1.2.2/usr/local/php/bin/phpize./configure --with-php-config=/usr/local/php/bin/php-configmake && make install

Configure PHP.ini

[taint]extension=taint.sotaint.enable=1taint.error_level=E_WARNING

Run results

php -i | grep tainttainttaint support => enabledtaint.enable => On => Ontaint.error_level => 2 => 2

# # #附录

A. Validated string
All from G E T , G E T, _post, $_cookie variables, are considered to be tainted String

B. A list of functions/statements detected by taint, taint will give a warning when these functions use tainted string arguments:

1. 输出函数/语句系列    echo    print    printf    file_put_contents2. 文件系统函数    fopen    opendir    basename    dirname    file    pathinfo3. 数据库系列函数/方法    mysql_query    mysqli_query    sqlite_query    sqlite_single_query    oci_parse    Mysqli::query    SqliteDataBase::query    SqliteDataBase::SingleQuery    PDO::query    PDO::prepare4. 命令行系列    system    exec    proc_open    passthru    shell_exec5. 语法结构    eval    include(_once)    require(_once)

C. Functions that eliminate tainted information, and when these functions are called, the tainted string becomes a valid string:

escapeshellcmdhtmlspecialcharsescapeshellcmdaddcslashesaddslashesmysqli_escape_stringmysql_real_escape_stringmysql_escape_stringsqlite_escape_stringPDO::quoteMysqli::escape_stringMysql::real_escape_string

D. Functions/statements that hold tainted information in the call, when these functions/statements are called, the output is also tainted string if the input is tainted string:

=."{$var}.=strvalexplodeimplodesprintfvsprintftrimrtrimltrim

From for notes (Wiz)

PHP extension--taint detect hidden vulnerabilities