Description
Drupal Core is prone to a directory traversal vulnerability because it fails to sufficiently verify user-supplied input. Exploiting this issue can allow an attacker to obtain sensitive information that could aid in further attacks. Drupal Core versions 8.9.x ranging from 8.9.0 and up to and including 8.9.16 are vulnerable.
Remediation
Update to Drupal Core version 8.9.17 or latest
References
https://www.drupal.org/sa-core-2021-004
https://github.com/pear/Archive_Tar/commit/b5832439b1f37331fb4f87e67fe4f
Related Vulnerabilities
WordPress Server-Side Request Forgery (SSRF) Vulnerability (CVE-2017-9066)
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NextScripts:Social Networks Auto-Poster Cross-Site Scripting (4.3.20)
Oracle Database Server CVE-2019-2516 Vulnerability (CVE-2019-2516)
WebLogic Deserialization of Untrusted Data Vulnerability (CVE-2018-3245)