CWE

CWE-33 – Path Traversal: ‘….’ (Multiple Dot)

Read Time:55 Second

Description

The software uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize ‘….’ (multiple dot) sequences that can resolve to a location that is outside of that directory.

Modes of Introduction:

– Implementation

 

 

Related Weaknesses

CWE-23

 

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-1999-1082
    • read files via “……” in web server (doubled triple dot?)
  • CVE-2004-2121
    • read files via “……” in web server (doubled triple dot?)
  • CVE-2001-0491
    • multiple attacks using “..”, “…”, and “….” in different commands