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Insecure exceptions - Empty or no catch

Description​

The application does not perform proper exception handling. Empty catch statements are found, or try statements without their respective catch. This behavior can make the application temporarily or permanently unavailable by presenting errors that are not being handled.

Impact​

  • Generate the crash of the application due to errors that are not being taken into account.
  • Lose the traceability of the errors presented.

Recommendation​

For every try sentence define its respective catch handling the exception accordingly.

Threat​

Authenticated attacker from the Internet.

Expected Remediation Time​

⌚ 40 minutes.

Score​

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

Base​

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

Temporal​

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

Result​

  • Vector string: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:U/RC:C
  • Score:
    • Base: 3.1
    • Temporal: 3.0
  • Severity:
    • Base: Low
    • Temporal: Low

Code Examples​

Compliant code​

All try sentences are accompanied by a catch sentence that correctly handles any exception

def handleUserInput(userReq):
  try:
    getFile(userReq)
  Except:
    raise Exception("Error")
  //Next portion of the code

Non compliant code​

There are some try sentences without their respective catch to handle exceptions

def handleUserInput(userReq):
  try:
    getFile(userReq)
  //Next portion of the code without a catch sentence

Requirements​

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