Python Flask-Security - Open Redirect

2022-01-1807:21:00

ProjectDiscovery

github.com

6.1 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

6.4 Medium

AI Score

Confidence

High

5.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:P/I:P/A:N

0.001 Low

EPSS

Percentile

44.5%

JSON

Python Flask-Security contains an open redirect vulnerability. Existing code validates that the URL specified in the next parameter is either relative or has the same network location as the requesting URL. Certain browsers accept and fill in the blanks of possibly incomplete or malformed URLs. An attacker can redirect a user to a malicious site and possibly obtain sensitive information, modify data, and/or execute unauthorized operations.

id: CVE-2021-32618

info:
  name: Python Flask-Security - Open Redirect
  author: 0x_Akoko
  severity: medium
  description: Python Flask-Security contains an open redirect vulnerability. Existing code validates that the URL specified in the next parameter is either relative or has the same network location as the requesting URL. Certain browsers accept and fill in the blanks of possibly incomplete or malformed URLs. An attacker can redirect a user to a malicious site and possibly obtain sensitive information, modify data, and/or execute unauthorized operations.
  impact: |
    An attacker can craft a malicious URL that redirects users to a malicious website, leading to potential phishing attacks or the exploitation of other vulnerabilities.
  remediation: |
    Upgrade to the latest version of Python Flask-Security library to fix the open redirect vulnerability.
  reference:
    - https://github.com/Flask-Middleware/flask-security/security/advisories/GHSA-6qmf-fj6m-686c
    - https://github.com/Flask-Middleware/flask-security/issues/486
    - https://nvd.nist.gov/vuln/detail/CVE-2021-32618
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/ARPSyndicate/kenzer-templates
  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-2021-32618
    cwe-id: CWE-601
    epss-score: 0.00113
    epss-percentile: 0.43765
    cpe: cpe:2.3:a:flask-security_project:flask-security:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: flask-security_project
    product: flask-security
  tags: cve2021,cve,redirect,flask,flask-security_project

http:
  - method: GET
    path:
      - '{{BaseURL}}/login?next=\\\interact.sh'

    matchers:
      - type: regex
        part: header
        regex:
          - '(?m)^(?:Location\s*?:\s*?)(?:https?:\/\/|\/\/|\/\\\\|\/\\)(?:[a-zA-Z0-9\-_\.@]*)interact\.sh\/?(\/|[^.].*)?$' # https://regex101.com/r/L403F0/1
# digest: 490a0046304402207acbef18aa0010bc58e52948c92c8959a2c354c33dc25185577d33bc3177847c0220208482a310a7fd0552de2030e8147b5a244bfed28dbb16a153d017b3f06bb690:922c64590222798bb761d5b6d8e72950