This affects all versions of package Flask-Security. When using the get_post_logout_redirect and get_post_login_redirect functions, 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. 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. **Note:** Flask-Security is not maintained anymore.

The remote Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-6792-1 advisory.

    Naom Moshe discovered that Flask-Security incorrectly validated URLs. An attacker could use this issue to     redirect users to arbitrary URLs.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 06492bd5-085a-4cc0-9743-e30164bdcb1c advisory.

  - This affects all versions of package Flask-Security. When using the get_post_logout_redirect and     get_post_login_redirect functions, 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. 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. **Note:** Flask-Security is not maintained     anymore. (CVE-2021-23385)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Debian 10 host has a package installed that is affected by a vulnerability as referenced in the dla-3545 advisory.

  - This affects all versions of package Flask-Security. When using the get_post_logout_redirect and     get_post_login_redirect functions, 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. 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. **Note:** Flask-Security is not maintained     anymore. (CVE-2021-23385)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE- SU-2022:3834-1 advisory.

  - This affects all versions of package Flask-Security. When using the get_post_logout_redirect and     get_post_login_redirect functions, 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. 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. **Note:** Flask-Security is not maintained     anymore. (CVE-2021-23385)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2022:3867-1 advisory.

  - This affects all versions of package Flask-Security. When using the get_post_logout_redirect and     get_post_login_redirect functions, 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. 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. **Note:** Flask-Security is not maintained     anymore. (CVE-2021-23385)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
198047	Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS : Flask-Security vulnerability (USN-6792-1)	Nessus	Ubuntu Local Security Checks	medium
180378	FreeBSD : py-flask-security -- user redirect to arbitrary URL vulnerability (06492bd5-085a-4cc0-9743-e30164bdcb1c)	Nessus	FreeBSD Local Security Checks	medium
180221	Debian DLA-3545-1 : flask-security - LTS security update	Nessus	Debian Local Security Checks	medium
170210	openSUSE 15 Security Update : python-Flask-Security (SUSE-SU-2022:3834-1)	Nessus	SuSE Local Security Checks	medium
166950	SUSE SLED15 / SLES15 Security Update : python-Flask-Security-Too (SUSE-SU-2022:3867-1)	Nessus	SuSE Local Security Checks	medium

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CVE-2021-23385

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