b2evolution CMS <6.11.6 - Open Redirect

mediumseverity

6.1CVSS score

13.8%likelihood of exploitation, next 30 days

97%of all CVEs are less likely

Readycheck to confirm it

b2evolution CMS before 6.11.6 contains an open redirect vulnerability via the redirect_to parameter in email_passthrough.php. An attacker can redirect a user to a malicious site and possibly obtain sensitive information, modify data, and/or execute unauthorized operations.

Impact

This vulnerability can be exploited by attackers to trick users into visiting malicious websites, potentially leading to phishing attacks, malware infections, or unauthorized access to sensitive information.

Fix

Upgrade b2evolution CMS to version 6.11.6 or later to mitigate the open redirect vulnerability (CVE-2020-22840).

How to confirm it

Send: GET {{BaseURL}}/email_passthrough.php?email_ID=1&type=link&email_key=5QImTaEHxmAzNYyYvENAtYHsFu7fyotR&redirect_to=http%3A%2F%2Finteract.sh
Positive when: matches in header /(?m)^(?:Location\s*?:\s*?)(?:https?://|//)?(?:[a-zA-Z0-9\-_]*\.)?interact\.sh(?…/

Run it with nuclei: nuclei -id CVE-2020-22840 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2020-22840

info:
  name: b2evolution CMS <6.11.6 - Open Redirect
  author: geeknik
  severity: medium
  description: b2evolution CMS before 6.11.6 contains an open redirect vulnerability via the redirect_to parameter in email_passthrough.php. An attacker can redirect a user to a malicious site and possibly obtain sensitive information, modify data, and/or execute unauthorized operations.
  impact: |
    This vulnerability can be exploited by attackers to trick users into visiting malicious websites, potentially leading to phishing attacks, malware infections, or unauthorized access to sensitive information.
  remediation: |
    Upgrade b2evolution CMS to version 6.11.6 or later to mitigate the open redirect vulnerability (CVE-2020-22840).
  reference:
    - https://github.com/b2evolution/b2evolution/issues/102
    - http://packetstormsecurity.com/files/161362/b2evolution-CMS-6.11.6-Open-Redirection.html
    - https://www.exploit-db.com/exploits/49554
    - https://nvd.nist.gov/vuln/detail/CVE-2020-22840
    - 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-2020-22840
    cwe-id: CWE-601
    epss-score: 0.13817
    epss-percentile: 0.96548
    cpe: cpe:2.3:a:b2evolution:b2evolution:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: b2evolution
    product: b2evolution
  tags: cve,cve2020,packetstorm,edb,redirect,b2evolution,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/email_passthrough.php?email_ID=1&type=link&email_key=5QImTaEHxmAzNYyYvENAtYHsFu7fyotR&redirect_to=http%3A%2F%2Finteract.sh"

    matchers:
      - type: regex
        part: header
        regex:
          - '(?m)^(?:Location\s*?:\s*?)(?:https?://|//)?(?:[a-zA-Z0-9\-_]*\.)?interact\.sh(?:\s*?)$'

References

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