Path Equivalence: 'filedir\' (Trailing Backslash)

Opis

The product accepts path input in the form of trailing backslash ('filedir\') without appropriate validation, which can lead to ambiguous path resolution and allow an attacker to traverse the file system to unintended locations or access arbitrary files.

Skutki

• Confidentiality, Integrity

  Read Files or Directories; Modify Files or Directories

Zapobieganie

• Implementation · Input Validation

  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.

Przykłady podatności

• CVE-2004-0847 web framework for .NET allows remote attackers to bypass authentication for .aspx files in restricted directories via a request containing a (1) "\" (backslash) or (2) "%5C" (encoded backslash)
• CVE-2004-0061 Bypass directory access restrictions using trailing dot in URL

Słabość nadrzędna

• CWE-41 Improper Resolution of Path Equivalence
• CWE-162 Improper Neutralization of Trailing Special Elements

Kiedy powstaje

• Implementation
• Porting

Dotyczy

Not Language-Specific, Windows, Not Technology-Specific