CVE-2020-13671

CVE-2020-13671 is a high-severity (CVSS 8.8) vulnerability in Drupal Drupal core. CISA added it to the Known Exploited Vulnerabilities catalog on January 18, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by July 18, 2022. CISA does not currently list it as used in ransomware campaigns. Drupal has 5 vulnerabilities in the KEV catalog, 2 of them linked to ransomware.

Drupal core does not properly sanitize certain filenames on uploaded files, which can lead to files being interpreted as the incorrect extension and served as the wrong MIME type or executed as PHP for certain hosting configurations. This issue affects: Drupal Drupal Core 9.0 versions prior to 9.0.8, 8.9 versions prior to 8.9.9, 8.8 versions prior to 8.8.11, and 7 versions prior to 7.74.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5KSFM672XW3X6BR7TVKRD63SLZGKK437/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KWM4CTMEGAC4I2CHYNJVSROY4CVXVEUT/
• https://www.drupal.org/sa-core-2020-012
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5KSFM672XW3X6BR7TVKRD63SLZGKK437/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KWM4CTMEGAC4I2CHYNJVSROY4CVXVEUT/
• https://www.drupal.org/sa-core-2020-012
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-13671