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Description
The software does not properly handle when all or part of an input has been URL encoded.
Modes of Introduction:
– Implementation
Related Weaknesses
CWE-172
Consequences
Integrity: Unexpected State
Potential Mitigations
Phase: Architecture and Design
Description:
Avoid making decisions based on names of resources (e.g. files) if those resources can have alternate names.
Phase: Implementation
Description:
Phase: Implementation
Description:
Inputs should be decoded and canonicalized to the application’s current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.
CVE References
- CVE-2000-0900
- Hex-encoded path traversal variants – “%2e%2e”, “%2e%2e%2f”, “%5c%2e%2e”
- CVE-2005-2256
- Hex-encoded path traversal variants – “%2e%2e”, “%2e%2e%2f”, “%5c%2e%2e”
- CVE-2004-2121
- Hex-encoded path traversal variants – “%2e%2e”, “%2e%2e%2f”, “%5c%2e%2e”
- CVE-2004-0072
- “%5c” (encoded backslash) and “%2e” (encoded dot) sequences
