Lack of data validation - Path Traversal

Description

The software uses external input to construct a pathname that is intended to identify a file or directory but it does not properly neutralize or validate special elements within the pathname.

Impact

Make the software resolve the pathname to a location that is outside of the intended target, for instance: /etc/passwd.

Recommendation

• Prevent the attacker from constructing the pathname.
• Validate/Neutralize the input for special elements like: .., ~, /.

Threat

Authenticated attacker from the Internet.

Expected Remediation Time

⌚ minutes.

Score

Default score using CVSS 3.1. It may change depending on the context of the src.

Base

• Attack vector: N
• Attack complexity: L
• Privileges required: N
• User interaction: N
• Scope: U
• Confidentiality: L
• Integrity: N
• Availability: N

Temporal

• Exploit code madurity: P
• Remediation level: X
• Report confidence: X

Result

• Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:X/RC:X
• Score:
  • Base: 5.3
  • Temporal: 5.0
• Severity:
  • Base: Medium
  • Temporal: Medium

Requirements

• 173.Discard unsafe inputs
• 320.Avoid client-side control enforcement
• 342.Validate request parameters

Fixes

• Scala
• Elixir
• Go
• Python
• Ruby
• C-Sharp
• Java
• PHP
• TypeScript

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