Tag Archives: CVE-2002-1987

CWE

CWE-30 – Path Traversal: ‘dir..filename’

Read Time:43 Second

Description

The software uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize ‘dir..filename’ (leading backslash dot 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

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-2002-1987
    • Protection mechanism checks for “/..” but doesn’t account for Windows-specific “..” allowing read of arbitrary files.
CWE

CWE-29 – Path Traversal: ‘..filename’

Read Time:50 Second

Description

The software uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize ‘..filename’ (leading backslash dot 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

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-2002-1987
    • Protection mechanism checks for “/..” but doesn’t account for Windows-specific “..” allowing read of arbitrary files.
  • CVE-2005-2142
    • Directory traversal vulnerability in FTP server allows remote authenticated attackers to list arbitrary directories via a “..” sequence in an LS command.