CVE-2020-13671 Drupal Drupal core: dangerous file upload
In plain words: The program accepts files it should refuse, such as programs disguised as ordinary uploads. The attacker can place and run their own tools on the server.
Confirmed exploited by CISA on · US federal patch deadline Jul 18, 2022
What to do
- Install Drupal's security update for Drupal core. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Drupal core Un-restricted Upload of File
- Product
- Drupal Drupal core
- CISA description
- Improper sanitization in the extension file names is present in Drupal core.
- Type of flaw
- Dangerous file upload (CWE-434)
- Confirmed exploited
- Jan 18, 2022
- US federal patch deadline
- Jul 18, 2022
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Answering about CVE-2020-13671 ·
Questions about CVE-2020-13671
Is CVE-2020-13671 being exploited?
Yes. CISA added CVE-2020-13671 to its Known Exploited Vulnerabilities catalog on Jan 18, 2022, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2020-13671?
Install Drupal's security update for Drupal core. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2020-13671?
Only if you use Drupal Drupal core. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.