CWE-76
Improper Neutralization of Equivalent Special Elements
AI Translation Available
The product correctly neutralizes certain special elements, but it improperly neutralizes equivalent special elements.
Status
draft
Abstraction
base
Likelihood
high
Affected Platforms
Extended Description
AI Translation
The product may have a fixed list of special characters it believes is complete. However, there may be alternate encodings, or representations that also have the same meaning. For example, the product may filter out a leading slash (/) to prevent absolute path names, but does not account for a tilde (~) followed by a user name, which on some *nix systems could be expanded to an absolute pathname. Alternately, the product might filter a dangerous '-e' command-line switch when calling an external program, but it might not account for '--exec' or other switches that have the same semantics.
Technical Details
AI Translation
Common Consequences
other
Impacts
other
Potential Mitigations
Phases:
requirements
implementation
Descriptions:
•
Programming languages and supporting technologies might be chosen which are not subject to these issues.
•
Utilize an appropriate mix of allowlist and denylist parsing to filter equivalent special element syntax from all input.