1689
MemberOf Relationships
This MemberOf relationships table shows additional CWE Catgeories and Views that reference this
weakness as a member. This information is often useful in understanding where a weakness fits
within the context of external information sources.
Nature Type ID Name Page
MemberOf 1407 Comprehensive Categorization: Improper Neutralization 1400 2532
CWE-797: Only Filtering Special Elements at an Absolute Position
Weakness ID : 797
Structure : Simple
Abstraction : Variant
Description
The product receives data from an upstream component, but only accounts for special elements at
an absolute position (e.g. "byte number 10"), thereby missing remaining special elements that may
exist before sending it to a downstream component.
Relationships
The table(s) below shows the weaknesses and high level categories that are related to this
weakness. These relationships are defined as ChildOf, ParentOf, MemberOr 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 may want to be explored.
Relevant to the view "Research Concepts" (CWE-1000)
Nature Type ID Name Page
ChildOf 795 Only Filtering Special Elements at a Specified Location 1685
Relevant to the view "Architectural Concepts" (CWE-1008)
Nature Type ID Name Page
MemberOf 1019 Validate Inputs 2433
Common Consequences
Scope Impact Likelihood
Integrity Unexpected State
Demonstrative Examples
Example 1:
The following code takes untrusted input and uses a substring function to filter a 3-character "../"
element located at the 0-index position of the input string. It then appends this result to the /home/
user/ directory and attempts to read the file in the final resulting path.
Example Language: Perl (Bad)
my $Username = GetUntrustedInput();
if (substr($Username, 0, 3) eq '../') {
$Username = substr($Username, 3);
}
my $filename = "/home/user/" . $Username;
ReadAndSendFile($filename);
Since the if function is only looking for a substring of "../" between the 0 and 2 position, it only
removes that specific "../" element. So an input value such as:
CWE Version 4.14
CWE-798: Use of Hard-coded Credentials
CWE-798: Use of Hard-coded Credentials