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Improper resource allocation - Memory leak

Description

The system may not be able to release inbound and outbound flow resources that have been opened, because they are not explicitly closed within the source code.

Impact

Exhaust server resources.

Recommendation

Outflows must be explicitly shut down immediately after use.

Threat

Anonymous attacker from the Internet.

Expected Remediation Time

⌚ 30 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: N
  • User interaction: N
  • Scope: U
  • Confidentiality: N
  • Integrity: N
  • Availability: L

Temporal

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

Result

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

Code Examples

Compliant code

The outflows of the application are explicitly shut down after use

def createConnection(host, port, limit):
serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = socket.gethostname()
serversocket.bind((host, port))
serversocket.listen(limit)

while True:
clientsocket,addr = serversocket.accept()
msg = 'Thank you for connecting'+ "
"
clientsocket.send(msg.encode('ascii'))
//Close resources after consuming them
clientsocket.close()
return

Non compliant code

The application includes a function that leaves an opened socket

def createConnection(host, port, limit):
serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = socket.gethostname()
serversocket.bind((host, port))
serversocket.listen(limit)

while True:
clientsocket,addr = serversocket.accept()
msg = 'Thank you for connecting'+ "
"
clientsocket.send(msg.encode('ascii'))
return

Requirements

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