CVE-2020-21524 XML external entity in n/a

Critical 9.1 Published 30 Sep 2020 Updated 4 Aug 2024

An attacker can exploit an XML External Entity vulnerability in Halo's blog import feature to read files and launch DDoS attacks.

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-2020-21524?

CVE-2020-21524 is a critical 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

There is a XML external entity (XXE) vulnerability in halo v1.1.3, The function of importing other blogs in the background(/api/admin/migrations/wordpress) needs to parse the xml file, but it is not used for security defense, This vulnerability can detect the intranet, read files, enable ddos attacks, etc. exp:https://github.com/halo-dev/halo/issues/423

Weakness: CWE-611

Which versions are affected by CVE-2020-21524?

It affects 1 product.

Products include Halo Halo.

How do I fix CVE-2020-21524?

No fix has been published for CVE-2020-21524 yet. Limit exposure of the affected software until one is available.

Is CVE-2020-21524 being exploited?

There is no known exploitation of CVE-2020-21524 in the wild and no public exploit code.

Sources

Also known as GHSA-mr5m-8j6x-5qpr.