阿里云提示 Didcuz memcache+ssrf GETSHELL漏洞修复方法

最新推荐文章于 2024-10-24 12:18:57 发布

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最新推荐文章于 2024-10-24 12:18:57 发布

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分类专栏： Discuz! 网站运营 php 安全 Discuz!技术专栏文章标签： discuz php 安全漏洞修复

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本文介绍了一种修复Discuz中Memcache SSRF GETSHELL漏洞的方法，通过在function_core.php文件中添加一行代码来增强安全性，并提供了具体步骤。

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近期很多使用阿里云的站长收到了阿里云给出的漏洞消息，漏洞名称如下：
Discuz memcache+ssrf GETSHELL漏洞
这里给大家提供一个简单的修复方案！
首先找到这个文件
source/function/function_core.php
搜索代码：

function output_replace($content) {
	global $_G;
	if(defined('IN_MODCP') || defined('IN_ADMINCP')) return $content;
	if(!empty($_G['setting']['output']['str']['search'])) {
		if(empty($_G['setting']['domain']['app']['default'])) {
			$_G['setting']['output']['str']['replace'] = str_replace('{CURHOST}', $_G['siteurl'], $_G['setting']['output']['str']['replace']);
		}
		$content = str_replace($_G['setting']['output']['str']['search'], $_G['setting']['output']['str']['replace'], $content);
	}
	if(!empty($_G['setting']['output']['preg']['search']) && (empty($_G['setting']['rewriteguest']) || empty($_G['uid']))) {
		if(empty($_G['setting']['domain']['app']['default'])) {
			$_G['setting']['output']['preg']['search'] = str_replace('\{CURHOST\}', preg_quote($_G['siteurl'], '/'), $_G['setting']['output']['preg']['search']);
			$_G['setting']['output']['preg']['replace'] = str_replace('{CURHOST}', $_G['siteurl'], $_G['setting']['output']['preg']['replace']);
		}


		foreach($_G['setting']['output']['preg']['search'] as $key => $value) {
			$content = preg_replace_callback($value, create_function('$matches', 'return '.$_G['setting']['output']['preg']['replace'][$key].';'), $content);
		}
	}


	return $content;
}

添加一行代码，如下

function output_replace($content) {
	global $_G;
	if(defined('IN_MODCP') || defined('IN_ADMINCP')) return $content;
	if(!empty($_G['setting']['output']['str']['search'])) {
		if(empty($_G['setting']['domain']['app']['default'])) {
			$_G['setting']['output']['str']['replace'] = str_replace('{CURHOST}', $_G['siteurl'], $_G['setting']['output']['str']['replace']);
		}
		$content = str_replace($_G['setting']['output']['str']['search'], $_G['setting']['output']['str']['replace'], $content);
	}
	if(!empty($_G['setting']['output']['preg']['search']) && (empty($_G['setting']['rewriteguest']) || empty($_G['uid']))) {
		if(empty($_G['setting']['domain']['app']['default'])) {
			$_G['setting']['output']['preg']['search'] = str_replace('\{CURHOST\}', preg_quote($_G['siteurl'], '/'), $_G['setting']['output']['preg']['search']);
			$_G['setting']['output']['preg']['replace'] = str_replace('{CURHOST}', $_G['siteurl'], $_G['setting']['output']['preg']['replace']);
		}
		
		if (preg_match("(/|#|\+|%).*(/|#|\+|%)e", $_G['setting']['output']['preg']['search']) !== FALSE) { die("request error"); }//本行代码为新增代码
		
		foreach($_G['setting']['output']['preg']['search'] as $key => $value) {
			$content = preg_replace_callback($value, create_function('$matches', 'return '.$_G['setting']['output']['preg']['replace'][$key].';'), $content);
		}
	}


	return $content;
}

然后将修改好的文件保存，上传到服务器目录覆盖一下，然后去阿里云对应漏洞提示后面点击“验证一下”，验证时候漏洞提示就会消失！
问题解决！