Description
A software system that accepts input in the form of a slash absolute path (‘/absolute/pathname/here’) without appropriate validation can allow an attacker to traverse the file system to unintended locations or access arbitrary files.
Modes of Introduction:
– Implementation
Related Weaknesses
CWE-36
CWE-160
Consequences
Confidentiality, Integrity: Read Files or Directories, Modify Files or Directories
Potential Mitigations
Phase: Implementation
Effectiveness: High
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-2002-1345
- Multiple FTP clients write arbitrary files via absolute paths in server responses
- CVE-2000-0614
- Arbitrary files may be overwritten via compressed attachments that specify absolute path names for the decompressed output.
