SB2021010711 - Multiple vulnerabilities in Plone

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) XML External Entity injection (CVE-ID: CVE-2020-28734)

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient validation of user-supplied XML input. A remote authenticated attacker can pass a specially crafted XML code to the affected application and view contents of arbitrary files on the system or initiate requests to external systems.

Successful exploitation of the vulnerability may allow an attacker to view contents of arbitrary file on the server or perform network scanning of internal and external infrastructure.

2) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2020-28735)

The disclosed vulnerability allows a remote attacker to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input in the tracebacks feature. A remote authenticated attacker can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.

3) XML External Entity injection (CVE-ID: CVE-2020-28736)

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient validation of user-supplied XML input. A remote authenticated attacker can pass a specially crafted XML code to the affected application and view contents of arbitrary files on the system or initiate requests to external systems.

Successful exploitation of the vulnerability may allow an attacker to view contents of arbitrary file on the server or perform network scanning of internal and external infrastructure.

Remediation

Install update from vendor's website.

References

• https://dist.plone.org/release/5.2.3/RELEASE-NOTES.txt
• https://github.com/plone/Products.CMFPlone/issues/3209
• https://www.misakikata.com/codes/plone/python-en.html