Insecure service configuration - DNS
Description
The DNS server has recursive DNS functionality, which can allow an attacker to perform an amplification attack through it and cause another server to crash.
Impact
Perform amplification attacks to cause DDos.
Recommendation
Disable recursive DNS functionality on the server.
Threat
Anonymous attacker from internal network.
Expected Remediation Time
⌚ 30 minutes.
Score
Default score using CVSS 3.1. It may change depending on the context of the src.
Base
- Attack vector: A
- Attack complexity: H
- Privileges required: N
- User interaction: N
- Scope: U
- Confidentiality: N
- Integrity: N
- Availability: L
Temporal
- Exploit code madurity: X
- Remediation level: X
- Report confidence: X
Result
- Vector string: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:X
- Score:
- Base: 3.1
- Temporal: 3.1
- Severity:
- Base: Low
- Temporal: Low
Score 4.0
Default score using CVSS 4.0 . It may change depending on the context of the src.
Base 4.0
- Attack vector: A
- Attack complexity: H
- Attack Requirements: N
- Privileges required: N
- User interaction: N
- Confidentiality (VC): N
- Integrity (VI): N
- Availability (VA): L
- Confidentiality (SC): N
- Integrity (SI): N
- Availability (SA): N
Threat 4.0
- Exploit madurity: X
Result 4.0
- Vector string: CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X
- Score:
- CVSS-BT: 2.3
- Severity:
- CVSS-BT: Low
Compliant code
The DNS server has no recursion services allowed
vars:
app_fqdn: myapp
timezone: "tz2"
dns_servers: ["myserver"]
dns_recursion_settings: "none"
Non compliant code
The DNS servers allow recursive settings
vars:
app_fqdn: myapp
timezone: "tz2"
dns_servers: ["myserver"]
dns_recursion_settings: "Any"
Requirements
Fixes
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