Path Traversal: 'dir\..\..\filename'

The software uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize 'dir\..\..\filename' (multiple internal backslash dot dot) sequences that can resolve to a location that is outside of that directory.


Description

This allows attackers to traverse the file system to access files or directories that are outside of the restricted directory.

The 'dir\..\..\filename' manipulation is useful for bypassing some path traversal protection schemes. Sometimes a program only removes one "..\" sequence, so multiple "..\" can bypass that check. Alternately, this manipulation could be used to bypass a check for "..\" at the beginning of the pathname, moving up more than one directory level.

See Also

SFP Secondary Cluster: Path Traversal

This category identifies Software Fault Patterns (SFPs) within the Path Traversal cluster (SFP16).

Comprehensive CWE Dictionary

This view (slice) covers all the elements in CWE.

Weaknesses Introduced During Implementation

This view (slice) lists weaknesses that can be introduced during implementation.


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