Zero-Day Advisory

Fortinet Discovers Plone Personal Homepage Cross-Site Scripting Vulnerability

Summary

Fortinet's FortiGuard Labs has discovered a Cross-Site Scripting vulnerability in Plone.

Plone is among the top 2% of all open source projects worldwide. It has more than 103,000 commits by nearly 900 code contributors. Plone is supported by more than 350 solution providers in more than 100 countries. The project has been actively developed since 2001, is available in more than 40 languages, and has the best security track record of any major CMS.

A Cross-Site Scripting vulnerability has been discovered in Plone. The vulnerability is caused by an error because the home_page property of a member of the Plone site isn't correctly sanitized. Malicious Javascript code can be provided in it. When a victim clicks the home page link on the author page, the malicious Javascript code can be executed.

Solutions

FortiGuard Labs released the following FortiGate IPS signature which covers this specific vulnerability:

Plone.Personal.Homepage.XSS
Released Jan 20, 2017

FortiWeb can protect this specific vulnerability since the signature package 10.077.

Users should apply the solution provided by Plone.

Additional Information

Fortinet reported the vulnerability to Plone on Jan. 20, 2017.

Plone confirmed the vulnerability on Jan. 20, 2017.

Plone released patch for the vulnerability on Nov. 28, 2017.

References

• https://plone.org/security/hotfix/20171128https://plone.org/security/hotfix/20171128/xss-using-the-home_page-member-property
• CVE-2017-1000482

Acknowledgement

This vulnerability was discovered by Zhouyuan Yang of Fortinet's FortiGuard Labs.

IPS Subscription

Fortinet customers who subscribe to Fortinet's intrusion prevention (IPS) service should be protected against this vulnerability with the appropriate configuration parameters in place. Fortinet's IPS service is one component of FortiGuard Subscription Services, which also offer comprehensive solutions such as antivirus, Web content filtering and antispam capabilities. These services enable protection against threats on both application and network layers. FortiGuard Services are continuously updated by FortiGuard Labs, which enables Fortinet to deliver a combination of multi-layered security intelligence and true zero-day protection from new and emerging threats. These updates are delivered to all FortiGate, FortiMail and FortiClient products. Fortinet strictly follows responsible disclosure guidelines to ensure optimum protection during a threat's lifecycle.