Open Redirect in Werkzeug library

1) Open redirect

EUVDB-ID: #VU48651

Risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-28724

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Exploit availability: No

Description

The vulnerability allows a remote attacker to redirect victims to arbitrary URL.

The vulnerability exists due to improper sanitization of user-supplied data within the double slash in the URL. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Werkzeug: 0.11 - 0.11.5

CPE2.3

• cpe:2.3:a:palletsprojects:werkzeug:0.11:*:*:*:*:*:*:*
• cpe:2.3:a:palletsprojects:werkzeug:0.11.1:*:*:*:*:*:*:*
• cpe:2.3:a:palletsprojects:werkzeug:0.11.2:*:*:*:*:*:*:*

External links

http://github.com/pallets/flask/issues/1639
http://github.com/pallets/werkzeug/issues/822
http://github.com/pallets/werkzeug/pull/890/files

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.