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Insecure service configuration - Antivirus

Description​

It is possible to evade antivirus signatures to upload and use hacking tools that are commonly detected by any antivirus by recompiling the binaries and source code of the tools and using obfuscation. This would allow an attacker to get information in memory, perform attacks on the Kerberos service or the organizations network, among others.

Impact​

  • Evade the organizations security controls to install malicious software.
  • Exfiltrate data.
  • Compromise data integrity.
  • Affect server availability.

Recommendation​

  • Use on-disk monitoring systems to detect the use of malicious tools.
  • Update detection and intelligence tools periodically.

Threat​

Internal attacker in the 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: L
  • User interaction: N
  • Scope: U
  • Confidentiality: L
  • Integrity: H
  • Availability: L

Temporal​

  • Exploit code madurity: F
  • Remediation level: X
  • Report confidence: X

Result​

  • Vector string: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L/E:F/RL:X/RC:X
  • Score:
    • Base: 6.8
    • Temporal: 6.6
  • Severity:
    • Base: Medium
    • Temporal: Medium

Code Examples​

Compliant code​

Every resource in the network has monitoring systems and antivirus correctly setup.

hosts: localhost
  vars:
  host: "192.168.122.40"
  username: "admin"
  password: ""
  vdom: "root"
  tasks:
  - name: Configure AntiVirus profiles.
    app_antivirus_profile:
      host:  "{{ host }}"
      username: "{{ username }}"
      password: "{{ password }}"
      vdom:  "{{ vdom }}"
      antivirus_profile:
        state: "present"
        analytics-bl-filetype: "3 (source dlp.filepattern.id)"
        analytics-db: "disable"
        analytics-max-upload: "5"
        analytics-wl-filetype: "6 (source dlp.filepattern.id)"
        av-block-log: "enable"
        av-virus-log: "enable"
        content-disarm:...
        extended-log: "enable"
        ftgd-analytics: "disable"
        ftp:...
        http:
            archive-block: "encrypted"
            archive-log: "encrypted"
            emulator: "enable"
            options: "scan"
            outbreak-prevention: "enabled"
        inspection-mode: "proxy"
        smb:...
        smtp:...

Non compliant code​

Some anti virus tools in the network are not up to date or poorly configured

hosts: localhost
  vars:
  host: "192.168.122.40"
  username: "admin"
  password: "mypassword"
  vdom: "root"
  tasks:
  - name: Configure AntiVirus profiles.
    app_antivirus_profile:
      host:  "{{ host }}"
      username: "{{ username }}"
      password: "{{ password }}"
      vdom:  "{{ vdom }}"
      antivirus_profile:
        state: "present"
        analytics-max-upload: "5"
        av-virus-log: "disable"
        extended-log: "enable"
        ftgd-analytics: "disable"
        http:
            emulator: "enable"
            options: "scan"
            outbreak-prevention: "disabled"
        inspection-mode: "proxy"

Requirements​

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