Описание
Products.isurlinportal has possible open redirect when using more than 2 forward slashes
Impact
A url /login?came_from=////evil.example may redirect to an external website after login.
Standard Plone is not affected, but if you have customised the login, for example with add-ons, you might be affected. You can try the url to check if you are affected or not.
Patches
The problem has been patched in Products.isurlinportal.
- Plone 6.2: upgrade to
Products.isurlinportal4.0.0. - Plone 6.1: upgrade to
Products.isurlinportal3.1.0. - Plone 6.0: upgrade to
Products.isurlinportal2.1.0. - Older Plone versions don't have security support anymore.
Workarounds
There are no known workarounds.
Background
When you are anonymous and land on a page that requires a login, Plone sends you to the login form. After successful login, Plone redirects you back to the page you came from. Various other forms and pages have a similar system.
This could get abused by an attacker to trick Plone into redirecting to a different website. Plone checks the page that would be redirected to. It is only accepted if it is within the Plone site domain or part of a different trusted domain.
The main check for this is in the Products.isurlinportal package. A lot of potentially malicious urls are already safely rejected, but here a loop hole was found.
This was discovered during a penetration test by the CERT-EU Team.
Пакеты
Products.isurlinportal
= 4.0.0a1
4.0.0
Products.isurlinportal
>= 3.0.0, < 3.1.0
3.1.0
Products.isurlinportal
< 2.1.0
2.1.0
products-isurlinportal
< 2.1.0
2.1.0
products-isurlinportal
>= 3.0.0, < 3.1.0
3.1.0
Связанные уязвимости
Products.isurlinportal is a replacement for isURLInPortal method in Plone. Prior to versions 2.1.0, 3.1.0, and 4.0.0, a url /login?came_from=////evil.example may redirect to an external website after login. This issue has been patched in versions 2.1.0, 3.1.0, and 4.0.0.