CVE-2023-42458: Zope vulnerable to Stored Cross Site Scripting with SVG images

Vulnerability summary

CVE-2023-42458 is a medium (CVSS 5.4) vulnerability in zope. EPSS estimates a 0.71% chance of exploitation in the next 30 days, higher than 53.7% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 21-09-2023
   PublishedVulnerability first disclosed.
2. 13-02-2025
   Last modifiedVulnerability information updated.

Description

Zope is an open-source web application server. Prior to versions 4.8.10 and 5.8.5, there is a stored cross site scripting vulnerability for SVG images. Note that an image tag with an SVG image as source is never vulnerable, even when the SVG image contains malicious code. To exploit the vulnerability, an attacker would first need to upload an image, and then trick a user into following a specially crafted link. Patches are available in Zope 4.8.10 and 5.8.5. As a workaround, make sure the "Add Documents, Images, and Files" permission is only assigned to trusted roles. By default, only the Manager has this permission.

• CWE-79Improper Neutralization of Input During Web Page GenerationThe product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
• CWE-80Improper Neutralization of Script-Related HTML Tags in a Web PageThe product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages.