Use of an insecure channel - Telnet
Description
Customer information is transmitted over a channel that does not use encryption, so credentials and confidential information can be captured in plain text.
Impact
Obtain Telnet credentials after a MitM attack.
Recommendation
Deploy the application over an encrypted communication channel.
Threat
Anonymous attacker from adjacent network.
Expected Remediation Time
⌚ 60 minutes.
Score
Default score using CVSS 3.1. It may change depending on the context of the vulnerability.
Base
- Attack vector: A
- Attack complexity: L
- Privileges required: N
- User interaction: R
- Scope: U
- Confidentiality: L
- Integrity: L
- Availability: N
Temporal
- Exploit code madurity: P
- Remediation level: O
- Report confidence: X
Result
- Vector string: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:X
- Score:
- Base: 4.6
- Temporal: 4.2
- Severity:
- Base: Medium
- Temporal: Medium
Code Examples
Compliant code
The application uses an secure channel to transmit data
public static void CreateTestMessage(string server){
SmtpClient client = new SmtpClient(server);
client.UseDefaultCredentials = true;
client.EnableSsl = true;
client.Send(exampleMessage);
}
Non compliant code
The application uses an insecure channel to transmit data
public static void CreateTestMessage(string server){
TcpClient telnet = new TcpClient("10.5.6.59", 23);
NetworkStream telnetStream = telnet.GetStream();
StreamWriter output = new StreamWriter(telnetStream);
StreamReader input = new StreamReader(telnetStream);
client.Send(ExampleMessage);
}
Requirements
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