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[email protected]CVE-2021-23401

HistoryJul 05, 2021 - 11:15 a.m.

CVE-2021-23401

2021-07-0511:15:07

CWE-601

[email protected]

web.nvd.nist.gov

cve-2021-23401

flask-user

url validation

redirection

bypass

security vulnerability

nvd

5.8 Medium

CVSS2

Attack Vector

NETWORK

Attack 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

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

0.001 Low

EPSS

Percentile

44.0%

JSON

This affects all versions of package Flask-User. When using the make_safe_url function, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as /////evil.com/path or \\evil.com/path. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using 'autocorrect_location_header=False.

Affected configurations

NVD

Node

flask-user_projectflask-user

CPENameOperatorVersion
flask-user_project:flask-userflask-user project flask-usereq*

CPE	Name	Operator	Version
flask-user_project:flask-user	flask-user project flask-user	eq	*

CNA Affected

[
  {
    "product": "Flask-User",
    "vendor": "n/a",
    "versions": [
      {
        "lessThan": "unspecified",
        "status": "affected",
        "version": "0",
        "versionType": "custom"
      }
    ]
  }
]