Open redirect in Plone - CVE-2020-7936

Detailed vulnerability description

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

The vulnerability exists due to improper sanitization of user-supplied data in the "isURLInPortal" check on the login form. 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.

How to mitigate CVE-2020-7936

Sources

• http://www.openwall.com/lists/oss-security/2020/01/24/1
• https://plone.org/security/hotfix/20200121
• https://plone.org/security/hotfix/20200121/an-open-redirection-on-the-login-form-and-possibly-other-places
• https://www.openwall.com/lists/oss-security/2020/01/22/1