Tag Archives: CVE-2000-0293

CWE

CWE-48 – Path Equivalence: ‘file name’ (Internal Whitespace)

Read Time:35 Second

Description

A software system that accepts path input in the form of internal space (‘file(SPACE)name’) 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

CWE-41

 

Consequences

Confidentiality, Integrity: Read Files or Directories, Modify Files or Directories

 

Potential Mitigations

CVE References

  • CVE-2000-0293
    • Filenames with spaces allow arbitrary file deletion when the product does not properly quote them; some overlap with path traversal.
  • CVE-2001-1567
    • “+” characters in query string converted to spaces before sensitive file/extension (internal space), leading to bypass of access restrictions to the file.
CWE

CWE-142 – Improper Neutralization of Value Delimiters

Read Time:1 Minute, 24 Second

Description

The software receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as value delimiters when they are sent to a downstream component.

As data is parsed, an injected/absent/malformed delimiter may cause the process to take unexpected actions.

Modes of Introduction:

– Implementation

 

 

Related Weaknesses

CWE-140

 

Consequences

Integrity: Unexpected State

 

Potential Mitigations

Phase:

Description: 

Developers should anticipate that value delimiters will be injected/removed/manipulated in the input vectors of their software system. Use an appropriate combination of denylists and allowlists to ensure only valid, expected and appropriate input is processed by the system.

Phase: Implementation

Description: 

Phase: Implementation

Description: 

While it is risky to use dynamically-generated query strings, code, or commands that mix control and data together, sometimes it may be unavoidable. Properly quote arguments and escape any special characters within those arguments. The most conservative approach is to escape or filter all characters that do not pass an extremely strict allowlist (such as everything that is not alphanumeric or white space). If some special characters are still needed, such as white space, wrap each argument in quotes after the escaping/filtering step. Be careful of argument injection (CWE-88).

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-2000-0293
    • Multiple internal space, insufficient quoting – program does not use proper delimiter between values.