Description
A software system that accepts path input in the form of single dot directory exploit (‘/./’) without appropriate validation can lead to ambiguous path resolution and allow an attacker to traverse the file system to unintended locations or access arbitrary files.
Modes of Introduction:
– Implementation
Related Weaknesses
Consequences
Confidentiality, Integrity: Read Files or Directories, Modify Files or Directories
Potential Mitigations
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-2000-0004
- Server allows remote attackers to read source code for executable files by inserting a . (dot) into the URL.
- CVE-2002-0304
- Server allows remote attackers to read password-protected files via a /./ in the HTTP request.
- BID:6042
- Input Validation error
- CVE-1999-1083
- Possibly (could be a cleansing error)
- CVE-2004-0815
- “/./////etc” cleansed to “.///etc” then “/etc”
- CVE-2002-0112
- Server allows remote attackers to view password protected files via /./ in the URL.