Insecure generation of random numbers - Static IV
Description
The application uses static, hardcoded values for initialization vectors. By knowing initialization vectors an attacker could perform a reverse engineering attack to predict the random values that should remain as secrets.
Impact
Predict random values to craft new attack vectors.
Recommendation
Generate initialization vectors randomly using mechanisms with secure randomness and high entropy.
Threat
Authenticated attacker from the Internet with access to the source code.
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: L
- User interaction: N
- Scope: U
- Confidentiality: L
- Integrity: N
- Availability: N
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:L/I:N/A:N/E:P/RL:U/RC:C
- Score:
- Base: 3.1
- Temporal: 3.0
- Severity:
- Base: Low
- Temporal: Low
Code Examples
Compliant code
The application includes secure encryption algorithms
from Crypto import Random
from Crypto.Cipher import AES
from Crypto.Util.Padding import paddef encrypt(value, key):
value = value.encode('ascii')
iv = Random.new().read(AES.block_size)
cipher = AES.new(key, AES.MODE_CBC, iv)
ciphertext = cipher.encrypt(pad(bytes(value, encoding='utf8'), size))
return iv + ciphertext
Non compliant code
The application uses insecure encryption algorithms
from Crypto import Random
from Crypto.Cipher import AES
from Crypto.Util.Padding import paddef encrypt(value, key):
value = value.encode('ascii')
iv = "HardCodedValue"
cipher = AES.new(key, AES.MODE_CBC, iv)
ciphertext = cipher.encrypt(pad(bytes(value, encoding='utf8'), size))
return iv + ciphertext
Requirements
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