一 代码执行函数
PHP中可以执行代码的函数。如eval()、assert()、``、system()、exec()、shell_exec()、passthru()、 escapeshellcmd()、pcntl_exec() 等
demo code 1.1:
二 文件包含代码注射
文件包含函数在特定条件下的代码注射,如include()、include_once()、 require()、require_once()。
当allow_url_include=On ,PHP Version>=5.2.0 时,导致代码注射。
demo code 2.1:
访问http://127.0.0.1/include.php?a=data:text/plain,%3C?php%20phpinfo%28%29;?%3E 即
执行phpinfo()。
三 正则匹配代码注射
众所周知的preg_replace()函数导致的代码注射。当pattern中存在/e模式修饰符,即允许执行代码。这里我们分三种情况讨论下
3.1 preg_replace() pattern 参数注射
pattern即第一个参数的代码注射。
当magic_quotes_gpc=Off时,导致代码执行。
demo code 3.1:
访问http://127.0.0.1/preg_replace1.php?reg=%3C\/php%3E/e 即
执行phpinfo()。
3.2 preg_replace() replacement参数注射
replacement即第二个参数的代码注射,导致代码执行。
demo code 3.2:
当我们提交 http://127.0.0.1/preg_replace2.php?h=phpinfo() 即
执行phpinfo()。
3.3 preg_replace()第三个参数注射
我们通过构造subject参数执行代码。提交:http://127.0.0.1/preg_replace3.php?h=
phpinfo()
或者 http://127.0.0.1/preg_replace3.php?h=
${phpinfo%28%29}
导致代码执行
demo code 3.3:
四 动态代码执行
4.1 动态变量代码执行
demo code 4.1:
我们提交 http://127.0.0.1/dyn_func.php?dyn_func=system&argument=ipconfig 执行ipconfig命令
4.2 动态函数代码执行
demo code 4.2:
我们提交 http://127.0.0.1/create_function.php?foobar=system%28dir%29 执行dir命令
五 其他
5.1 ob_start()函数的代码执行
demo code 5.1:
5.2 array_map()函数的代码执行
demo code 5.2:
我们提交 http://127.0.0.1/array_map.php?callback=phpinfo 即执行phpinfo()。
5.3 unserialize()与eval()
unserialize()是PHP中使用率非常高的函数。不正当使用unserialize()容易导致安全隐患。
我们提交 http://127.0.0.1/unserialize.php?saved_code=O:7:%22Example%22:1:{s:3:%22var%22;s:10:%22phpinfo%28%29;%22;} 即执行phpinfo()。
5.4 容易导致安全问题的函数
同类型函数还有很多
array_map()
usort(), uasort(), uksort()
array_filter()
array_reduce()
array_diff_uassoc(), array_diff_ukey()
array_udiff(), array_udiff_assoc(), array_udiff_uassoc()
array_intersect_assoc(), array_intersect_uassoc()
array_uintersect(), array_uintersect_assoc(), array_uintersect_uassoc()
array_walk(), array_walk_recursive()
xml_set_character_data_handler()
xml_set_default_handler()
xml_set_element_handler()
xml_set_end_namespace_decl_handler()
xml_set_external_entity_ref_handler()
xml_set_notation_decl_handler()
xml_set_processing_instruction_handler()
xml_set_start_namespace_decl_handler()
xml_set_unparsed_entity_decl_handler()
stream_filter_register()
set_error_handler()
register_shutdown_function()
register_tick_function()

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