Lack of data validation - Token

Description

The generated JWT access token does not validate if the signature is valid so the token can be modified and requests are accepted; even removing the signature from the token works.

Impact

• Generate tokens by bypassing existing mechanisms.
• Modify tokens allowing requests to be sent outside the application cycle.

Recommendation

Generate a token with random components without sensitive information and always validate that the integrity of the token is maintained (signature verification, signature).

Threat

Unauthorized attacker with access to a token.

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: H
• Privileges required: N
• User interaction: N
• Scope: U
• Confidentiality: N
• Integrity: L
• Availability: N

Temporal

• Exploit code madurity: U
• Remediation level: U
• Report confidence: C

Result

• Vector string: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:U/RC:C
• Score:
  • Base: 3.7
  • Temporal: 3.4
• Severity:
  • Base: Low
  • Temporal: Low

Requirements

• 173.Discard unsafe inputs
• 320.Avoid client-side control enforcement
• 357.Use stateless session tokens

Fixes

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

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