Asymmetric denial of service - ReDoS

Description

Within the source code there is evidence of the use of dangerous regular expressions, because they make use of complex operations to find matches, which can lead to an attacker sending a specific string of data that could cause the server to crash when evaluating the string with the dangerous regular expression.

Impact

Generate server crash.

Recommendation

Use optimized regular expressions to perform functions without much computational overhead.

Threat

Anonymous 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: N
• Integrity: N
• Availability: L

Temporal

• Exploit code madurity: U
• Remediation level: X
• Report confidence: R

Result

• Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:X/RC:R
• Score:
  • Base: 5.3
  • Temporal: 4.7
• Severity:
  • Base: Medium
  • Temporal: Medium

Requirements

• 072.Set maximum response time
• 327.Set a rate limit

Fixes

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

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