CWE-34: Path Traversal: '....//'
VariantIncomplete
The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize '....//' (doubled dot dot slash) sequences that can resolve to a location that is outside of that directory.
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Extended Description
This allows attackers to traverse the file system to access files or directories that are outside of the restricted directory. The '....//' manipulation is useful for bypassing some path traversal protection schemes. If "../" is filtered in a sequential fashion, as done by some regular expression engines, then "....//" can collapse into the "../" unsafe value (CWE-182). It could also be useful when ".." is removed, if the operating system treats "//" and "/" as equivalent.
Technical Details
- Structure
- Simple
Applicable To
Not Language-Specific