Common Weakness Enumeration

Incomplete filtering of this nature may be applied to:

The table(s) below shows the weaknesses and high level categories that are related to this weakness. These relationships are defined as ChildOf, ParentOf, MemberOf and give insight to similar items that may exist at higher and lower levels of abstraction. In addition, relationships such as PeerOf and CanAlsoBe are defined to show similar weaknesses that the user may want to explore.

Relevant to the view "Research Concepts" (CWE-1000)

Nature	Type	ID	Name
ChildOf	Variant - a weakness that is described at a very low level of detail, typically limited to a specific language or technology. More specific than a Base weakness.	792	Incomplete Filtering of One or More Instances of Special Elements

Relevant to the view "Architectural Concepts" (CWE-1008)

Nature	Type	ID	Name
MemberOf	Category - a CWE entry that contains a set of other entries that share a common characteristic.	1019	Validate Inputs

Relevant to the view "Development Concepts" (CWE-699)

Nature	Type	ID	Name
ChildOf	Variant - a weakness that is described at a very low level of detail, typically limited to a specific language or technology. More specific than a Base weakness.	792	Incomplete Filtering of One or More Instances of Special Elements

Example 1

The following code takes untrusted input and uses a regular expression to filter "../" from the input. It then appends this result to the /home/user/ directory and attempts to read the file in the final resulting path.

Since the regular expression does not have the /g global match modifier, it only removes the first instance of "../" it comes across. So an input value such as:

will have the first "../" stripped, resulting in:

This value is then concatenated with the /home/user/ directory:

which causes the /etc/passwd file to be retrieved once the operating system has resolved the ../ sequences in the pathname. This leads to relative path traversal (CWE-23).