Laravel 5.8 SQL 注入漏洞分析与防护指南<\/h1>

0x01 漏洞背景<\/h2>
Laravel框架是全球流行的PHP框架，2019年3月曝出一个与`ignore()<\/code>函数相关的SQL注入漏洞。该漏洞需要特定条件才能触发，主要影响使用Rule::unique()<\/code>验证规则并自定义ignore()<\/code>参数的应用。<\/p>`

0x02 漏洞环境搭建<\/h2>
测试环境要求<\/h3>

Laravel 5.8版本<\/li>
数据库表结构示例：<\/li>
<\/ul>
CREATE<\/span> TABLE<\/span> users (
<\/span><\/span>    id INT PRIMARY<\/span> KEY<\/span>,
<\/span><\/span>    username VARCHAR(255<\/span>) NOT<\/span> NULL<\/span>,
<\/span><\/span>    -- 其他字段...
<\/span><\/span><\/span><\/span>);
<\/span><\/span><\/code><\/pre>漏洞测试代码<\/h3>
$validator =<\/span> Validator<\/span>::<\/span>make<\/span>($request-><\/span>input<\/span>(), [
<\/span><\/span>    'username'<\/span> =><\/span> [
<\/span><\/span>        'required'<\/span>,
<\/span><\/span>        Rule<\/span>::<\/span>unique<\/span>("users"<\/span>)-><\/span>ignore<\/span>($request-><\/span>input<\/span>("id"<\/span>), $request-><\/span>input<\/span>("column"<\/span>))
<\/span><\/span>    ],
<\/span><\/span>]);
<\/span><\/span>dump<\/span>($validator-><\/span>fails<\/span>());
<\/span><\/span><\/code><\/pre>路由配置<\/h3>
Route<\/span>::<\/span>any<\/span>("index"<\/span>, "UserController@index"<\/span>);
<\/span><\/span><\/code><\/pre>0x03 漏洞原理分析<\/h2>
关键漏洞点<\/h3>


ignore()<\/code>函数处理机制<\/strong>：<\/p>

默认情况下，ignore()<\/code>只接受一个参数，表示要忽略的ID值，默认使用"id"作为列名<\/li>
当传入第二个参数时，可以自定义查询字段名<\/li>
<\/ul>
<\/li>

漏洞触发流程<\/strong>：<\/p>

攻击者可以控制ignore()<\/code>的第二个参数（列名）<\/li>
未经过滤的列名直接拼接到SQL查询中<\/li>
导致SQL注入漏洞<\/li>
<\/ul>
<\/li>
<\/ol>
代码执行流程<\/h3>

Rule::unique("users")->ignore($id, $column)<\/code>调用<\/li>
进入Illuminate\Validation\Rules\Unique<\/code>类的ignore()<\/code>方法<\/li>
最终调用toString()<\/code>方法生成SQL查询条件<\/li>
<\/ol>
修复前后对比<\/h3>
修复前代码<\/strong>：<\/p>
\/\/ 直接使用用户输入的列名
<\/span><\/span><\/span><\/span>$query-><\/span>where<\/span>($this-><\/span>ignoreColumn<\/span> ?:<\/span> 'id'<\/span>, '<>'<\/span>, $this-><\/span>ignore<\/span>);
<\/span><\/span><\/code><\/pre>修复后代码<\/strong>：<\/p>
\/\/ 对列名进行addslashes处理
<\/span><\/span><\/span><\/span>$query-><\/span>where<\/span>($this-><\/span>ignoreColumn<\/span> ?:<\/span> 'id'<\/span>, '<>'<\/span>, addslashes<\/span>($this-><\/span>ignore<\/span>));
<\/span><\/span><\/code><\/pre>0x04 漏洞复现与利用<\/h2>
正常请求示例<\/h3>
\/index?username=admin&id=2
<\/code><\/pre>
生成SQL：<\/p>
SELECT<\/span> COUNT<\/span>(*<\/span>) FROM<\/span> users WHERE<\/span> username =<\/span> 'admin'<\/span> AND<\/span> id <><\/span> '2'<\/span>
<\/span><\/span><\/code><\/pre>恶意利用请求<\/h3>
\/index?username=admin&id=1","liusha","&column=id
<\/code><\/pre>
导致生成的SQL：<\/p>
SELECT<\/span> COUNT<\/span>(*<\/span>) FROM<\/span> users WHERE<\/span> username =<\/span> 'admin'<\/span> AND<\/span> id <><\/span> '1","liusha","'<\/span>
<\/span><\/span><\/code><\/pre>这将引发数据库错误，因为"liusha"不是有效的列名。<\/p>
0x05 漏洞防护措施<\/h2>


官方修复方案<\/strong>：<\/p>

升级到Laravel 5.8.7或更高版本<\/li>
官方通过addslashes()<\/code>对输入进行过滤<\/li>
<\/ul>
<\/li>

开发建议<\/strong>：<\/p>

避免直接使用用户输入作为数据库列名<\/li>
对ignore()<\/code>的第二个参数进行白名单验证<\/li>
使用预定义的常量或枚举值代替动态列名<\/li>
<\/ul>
<\/li>

替代方案<\/strong>：<\/p>
<\/li>
<\/ol>
\/\/ 安全用法 - 固定列名
<\/span><\/span><\/span><\/span>Rule<\/span>::<\/span>unique<\/span>("users"<\/span>)-><\/span>ignore<\/span>($request-><\/span>input<\/span>("id"<\/span>))
<\/span><\/span>
<\/span><\/span>\/\/ 安全用法 - 使用白名单验证列名
<\/span><\/span><\/span><\/span>$allowedColumns =<\/span> ['id'<\/span>, 'username'<\/span>, 'email'<\/span>];
<\/span><\/span>if<\/span> (in_array<\/span>($request-><\/span>input<\/span>('column'<\/span>), $allowedColumns)) {
<\/span><\/span>    Rule<\/span>::<\/span>unique<\/span>("users"<\/span>)-><\/span>ignore<\/span>($request-><\/span>input<\/span>("id"<\/span>), $request-><\/span>input<\/span>("column"<\/span>))
<\/span><\/span>}
<\/span><\/span><\/code><\/pre>0x06 漏洞影响评估<\/h2>


影响范围<\/strong>：<\/p>

仅影响使用Rule::unique()<\/code>并自定义ignore()<\/code>列名的应用<\/li>
实际开发中这种用法较为少见<\/li>
<\/ul>
<\/li>

利用难度<\/strong>：<\/p>

需要知道或猜测表结构<\/li>
需要应用使用特定的验证规则写法<\/li>
<\/ul>
<\/li>

风险等级<\/strong>：<\/p>

中低风险，受限于特定使用场景<\/li>
但一旦满足条件，可导致完整的SQL注入<\/li>
<\/ul>
<\/li>
<\/ol>
0x07 总结<\/h2>
Laravel 5.8的这个SQL注入漏洞展示了框架验证机制中的一个边缘案例安全问题。虽然该漏洞需要特定条件才能触发，但它强调了几个重要的安全原则：<\/p>

永远不要信任用户输入，即使是看似无害的"列名"参数<\/li>
框架提供的便利方法可能隐藏着安全风险<\/li>
安全审计应特别关注数据从用户输入到SQL查询的完整路径<\/li>
<\/ol>
开发人员应定期更新框架版本，并审查自定义验证规则的安全性，特别是涉及数据库操作的部分。<\/p>

Laravel 5.8 SQL 注入漏洞分析与防护指南<\/h1>

0x01 漏洞背景<\/h2> Laravel框架是全球流行的PHP框架，2019年3月曝出一个与ignore()<\/code>函数相关的SQL注入漏洞。该漏洞需要特定条件才能触发，主要影响使用Rule::unique()<\/code>验证规则并自定义ignore()<\/code>参数的应用。<\/p>

0x03 漏洞原理分析<\/h2>

0x04 漏洞复现与利用<\/h2>

0x01 漏洞背景<\/h2>
Laravel框架是全球流行的PHP框架，2019年3月曝出一个与`ignore()<\/code>函数相关的SQL注入漏洞。该漏洞需要特定条件才能触发，主要影响使用Rule::unique()<\/code>验证规则并自定义ignore()<\/code>参数的应用。<\/p>`