CVE-2017-1000481 Information

Description

When you visit a page where you need to login Plone 2.5-5.1rc1 sends you to the login form with a ‘came_from’ parameter set to the previous url. After you login you get redirected to the page you tried to view before. An attacker might try to abuse this by letting you click on a specially crafted link. You would login and get redirected to the site of the attacker letting you think that you are still on the original Plone site. Or some javascript of the attacker could be executed. Most of these types of attacks are already blocked by Plone using the isURLInPortal check to make sure we only redirect to a page on the same Plone site. But a few more ways of tricking Plone into accepting a malicious link were discovered and fixed with this hotfix.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Reference

https://plone.org/security/hotfix/20171128/open-redirection-on-login-form When you visit a page where you need to login Plone 2.5-5.1rc1 sends you to the login form with a ‘came_from’ parameter set to the previous url. After you login you get redirected to the page you tried to view before. An attacker might try to abuse this by letting you click on a specially crafted link. You would login and get redirected to the site of the attacker letting you think that you are still on the original Plone site. Or some javascript of the attacker could be executed. Most of these types of attacks are already blocked by Plone using the isURLInPortal check to make sure we only redirect to a page on the same Plone site. But a few more ways of tricking Plone into accepting a malicious link were discovered and fixed with this hotfix.

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

6.1