Insecure encryption algorithm - Perfect Forward Secrecy
Description
The application uses cipher algorithms that expose all messages made during the communication if the current private key is compromised.
Impact
Obtain sensitive information that is being transmitted or has been stored.
Recommendation
Enable Perfect-Forward-Secrecy in the server side, by allowing Ciphersuites that contain DHE and ECDHE on its names.
Threat
Unauthorized attacker from adjacent network that has compromised a private key.
Expected Remediation Time
⌚ 15 minutes.
Score
Default score using CVSS 3.1. It may change depending on the context of the vulnerability.
Base
- Attack vector: A
- Attack complexity: H
- Privileges required: N
- User interaction: R
- Scope: U
- Confidentiality: L
- Integrity: N
- Availability: N
Temporal
- Exploit code madurity: P
- Remediation level: O
- Report confidence: X
Result
- Vector string: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:X
- Score:
- Base: 2.6
- Temporal: 2.4
- Severity:
- Base: Low
- Temporal: Low
Code Examples
Compliant code
The application only includes secure encryption algorithms
http {
server {
index index.html;
listen localhost:4446 ssl;
location / {
root server_root;
}
server_name localhost;
ssl_prefer_server_ciphers off;
ssl_ciphers "EECDH+AESGCM:EDH+AESGCM";
ssl_certificate ert.crt;
ssl_certificate_key cert.key;
ssl_protocols SSLv3 TLSv1 TLSv1.2;
}
}
Non compliant code
Some insecure encryption algorithms are included in the server configuration
http {
server {
index index.html;
listen localhost:4446 ssl;
location / {
root server_root;
}
server_name localhost;
ssl_prefer_server_ciphers off;
ssl_ciphers "ADH-AES128-SHA:ADH-AES256-SHA:ADH-CAMELLIA128-SHA:ADH-CAMELLIA256-SHA:ADH-DES-CBC3-SHA:ADH-RC4-MD5:ADH-SEED-SHA:AES128-SHA:AES256-SHA:CAMELLIA128-SHA:ADH-SEED-SHA:AES128-SHA";
ssl_certificate ert.crt;
ssl_certificate_key cert.key;
ssl_protocols SSLv3 TLSv1 TLSv1.1;
}
}
Requirements
- 148. Set minimum size of asymmetric encryption
- 149. Set minimum size of symmetric encryption
- 150. Set minimum size for hash functions
- 181. Transmit data using secure protocols
- 336. Disable insecure TLS versions
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