CVE-2020-21523 Code injection in n/a
Attackers can execute arbitrary code via Server-Side Template Injection in Halo CMS theme editor, requiring administrative access to edit template files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-21523?
CVE-2020-21523 is a critical code injection vulnerability in n/a, published on 30 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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: CWE-74
Which versions are affected by CVE-2020-21523?
It affects 1 product.
Products include Halo Halo.
How do I fix CVE-2020-21523?
No fix has been published for CVE-2020-21523 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2020-21523 being exploited?
There is no known exploitation of CVE-2020-21523 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-mx65-vqhq-g7wg.