Unrestricted access between network segments - StrictHostKeyChecking
Description
The JSch StrictHostKeyChecking configuration is set to no, this indicates that connections may be made to unknown servers or servers that have changed their keys, generating new ones and adding them by default to the known server files.
Impact
- Start connections to untrusted servers.
- Increase the possibility of attacks such as MitM and spoofing.
- Receive or send malicious data or files.
- Leak sensitive information such as users and passwords.
Recommendation
- Limit access to administrative services such as SSH.
- Implement safe values for StricktHostKeyChecking configuration.
Threat
Anonymous attacker from the Internet.
Expected Remediation Time
⌚ 15 minutes.
Score
Default score using CVSS 3.1. It may change depending on the context of the src.
Base
- Attack vector: N
- Attack complexity: H
- Privileges required: N
- User interaction: N
- Scope: U
- Confidentiality: L
- Integrity: L
- Availability: N
Temporal
- Exploit code maturity: P
- Remediation level: O
- Report confidence: X
Result
- Vector string: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:P/RL:O/RC:X
- Score:
- Base: 4.8
- Temporal: 4.3
- Severity:
- Base: Medium
- Temporal: Medium
Score 4.0
Default score using CVSS 4.0. It may change depending on the context of the src.
Base 4.0
- Attack vector: N
- Attack complexity: H
- Attack Requirements: N
- Privileges required: N
- User interaction: N
- Confidentiality (VC): L
- Integrity (VI): L
- Availability (VA): N
- Confidentiality (SC): N
- Integrity (SI): N
- Availability (SA): N
Threat 4.0
- Exploit maturity: P
Result 4.0
- Vector string: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
- Score:
- CVSS-BT: 2.9
- Severity:
- CVSS-BT: Low
Compliant code
The application enables Strict Host Key Checking
java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "yes");
session.setConfig(config);
Non compliant code
The application does not enable Strict Host Key Checking
java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);
Requirements
Fixes
