CVE Vulnerabilities

CVE-2020-21523

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Published: Sep 30, 2020 | Modified: Oct 09, 2020
CVSS 3.x
9.8
CRITICAL
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
10 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C
RedHat/V2
RedHat/V3
Ubuntu

A Server-Side Freemarker template injection vulnerability in halo CMS v1.1.3 In the Edit Theme File function. The ftl file can be edited. This is the Freemarker template file. This file can cause arbitrary code execution when it is rendered in the background. exp: <#assign test=freemarker.template.utility.Execute?new()> ${test(touch /tmp/freemarkerPwned)}

Weakness

The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

Affected Software

Name Vendor Start Version End Version
Halo Halo 1.1.3 (including) 1.1.3 (including)

Potential Mitigations

References