[Owasp-mumbai] What is Canonicalization ?
Dharmesh M Mehta
dharmeshmm at mastek.com
Thu Nov 3 05:28:00 EST 2005
Different forms of input that resolve to the same standard name (the
canonical name), is referred to as canonicalization.
Code is particularly susceptible to canonicalization issues if it makes
security decisions based on the name of a resource
that is passed to the program as input. Files, paths, and URLs are
resource types that are vulnerable to canonicalization
because in each case there are many different ways to represent the same
name. File names are also problematic.
Ideally, your code does not accept input file names. If it does, the
name should be converted to its canonical form prior
to making security decisions, such as whether access should be granted
or denied to the specified file.
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