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【学习笔记】SQL注入的“特殊战场”——不同场景与二阶注入

  • 2026-04-17 10:46:20
【学习笔记】SQL注入的“特殊战场”——不同场景与二阶注入

声明:文中涉及到的技术和工具,仅供学习使用,禁止从事任何非法活动,如因此造成的直接或间接损失,均由使用者自行承担责任。


一、开篇:当注入点不在“输入框”时

前六篇我们聚焦于URL参数、搜索框等“显性注入点”,但现实中,SQL注入可能藏在更隐蔽的地方:
Cookie里的sessionid;
HTTP Header中的User-Agent;
用XML/JSON格式传递的参数;
甚至“第一次注入,第二次触发”的二阶注入
PortSwigger原路径将这些称为“上下文相关的SQL注入”——注入点的位置和环境,直接决定了Payload的写法和绕过技巧。

二、特殊场景1:注入点在“非参数位置”

PortSwigger原路径重点讲解了4类非传统注入点,我们用“实战+绕过”拆解:

1. Cookie注入(最常见)

场景:某网站的Cookie中存储用户身份:Cookie: session=12345。应用逻辑:
SELECT * FROM users WHERE session_id = '12345';
注入方法:修改Cookie为' OR 1=1--,让SQL变成:
SELECT * FROM users WHERE session_id = '' OR 1=1--';
✅ 触发条件:应用直接从Cookie中取数据拼SQL,未过滤。

2. Header注入(User-Agent/Referer)

场景:应用记录用户访问日志,把User-Agent存入数据库:
INSERT INTO logs (ip, user_agent) VALUES ('1.2.3.4', 'Mozilla/5.0');
注入方法:修改User-Agent为' OR (SELECT 1)--,让SQL变成:
INSERT INTO logs (ip, user_agent) VALUES ('1.2.3.4''' OR (SELECT 1)--');
✅ 触发条件:应用未过滤Header中的特殊字符(如'、;)。

3. XML编码绕过(PortSwigger靶场实战)

场景:某网站的“订单提交”功能用XML传参:
<order>  <productId>1</productId>  <quantity>1</quantity></order>
应用逻辑:解析XML后拼接SQL:
SELECT * FROM orders WHERE product_id = '1' AND quantity = '1';
目标:绕过WAF过滤(WAF拦截'、OR等关键字)。
PortSwigger实验Payload(用XML实体编码):
<order>  <productId>1' &#x53;ELECT 1--</productId>  <quantity>1</quantity></order>
&#x53;是S的十六进制编码(WAF不认识,但XML解析后会还原成S);
最终SQL变成:
SELECT * FROM orders WHERE product_id = '1' SELECT 1--' AND quantity = '1';
✅ 成功绕过WAF,触发SQL注入!

三、特殊场景2:二阶注入(First insert, then execute)

PortSwigger原路径将二阶注入(Second-order SQLi)定义为:“第一次注入的数据被存储,第二次使用时才触发注入”。就像你把“炸弹”埋在数据库里,等有人“碰”它时才爆炸。
原理:两次查询的“时间差”
第一次请求:用户输入恶意数据(比如注册用户名' OR 1=1--),应用将其存入数据库(未执行);
第二次请求:应用从数据库取出该数据,拼接到SQL中执行——此时注入生效!

PortSwigger靶场实战:注册时的“隐藏炸弹”

场景:某网站的“用户注册”功能,注册时用username和password,登录时用username查询:
注册时,应用执行:INSERT INTO users (username, password) VALUES ('$username', '$password');
登录时,应用执行:SELECT * FROM users WHERE username = '$username' AND password = '$password';
目标:用二阶注入登录administrator账号(无需密码)。
步骤
注册用户名为' OR username='administrator'--,密码随便填(比如123);
应用将' OR username='administrator'--存入users表的username字段;
登录时,输入刚才的用户名和密码,应用执行:
SELECT * FROM users WHERE username = '' OR username='administrator'--' AND password = '123';

四、常见坑点与绕过技巧(PortSwigger原路径强调)

WAF过滤了',怎么办?
  • 检查数据存储时是否被转义(比如'被变成\')→ 用CHAR()函数(CHAR(39)');

  • 检查第二次查询是否真的用了该数据(比如登录时才查询,而不是注册后立即查询)。

二阶注入没反应?
  • 十六进制编码(MySQL):' OR 1=1--→ 0x27204f5220313d312d2d(需配合UNHEX());

  • 双写绕过' OR 'OR' 1=1--(WAF拦截OR,但双写后放行)。

五、防御:如何覆盖“特殊场景”?

PortSwigger原路径指出,特殊场景注入的根源是“所有用户输入(包括Cookie、Header、XML)都被当成SQL代码”,防御方法:
全输入点过滤:不仅过滤URL参数,还要过滤Cookie、Header、XML/JSON中的数据;
参数化查询(终极方案):不管是第一次插入还是第二次查询,都用?占位符(同第一篇);
二阶注入专项防御:存储数据时严格转义(比如mysqli_real_escape_string()),取出数据时再次验证。

六、互动与预告

小问题:你在测试中遇到过“Cookie注入”吗?是用Burp Suite的“Cookie Editor”修改的吗?欢迎评论区分享!
下期预告:我们将进入SQL注入的“终点”——防御篇,从代码层到架构层,彻底解决SQL注入问题。
(注:文中实验均基于PortSwigger Web Security Academy靶场,原文链接:https://portswigger.net/web-security/sql-injection)

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  1. CONNECT:[ UseTime:0.000584s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000762s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000394s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000322s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000523s ]
  6. SELECT * FROM `set` [ RunTime:0.000235s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000543s ]
  8. SELECT * FROM `article` WHERE `id` = 481476 LIMIT 1 [ RunTime:0.000468s ]
  9. UPDATE `article` SET `lasttime` = 1776412734 WHERE `id` = 481476 [ RunTime:0.006994s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000265s ]
  11. SELECT * FROM `article` WHERE `id` < 481476 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004106s ]
  12. SELECT * FROM `article` WHERE `id` > 481476 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000713s ]
  13. SELECT * FROM `article` WHERE `id` < 481476 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000771s ]
  14. SELECT * FROM `article` WHERE `id` < 481476 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001221s ]
  15. SELECT * FROM `article` WHERE `id` < 481476 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006052s ]
0.175901s