CVE-2019-6340 Critical flaw in Drupal allows Remote Code Execution
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2019-6340 | Deserialization RCE in Drupal 8 Core Web Services (CVE-2019-6340) Several field types in Drupal 8.5.x and 8.6.x fail to properly sanitize data arriving from non-form sources (CWE-502, deserialization of untrusted data), which can lead to arbitrary PHP code execution on the server. The flaw is triggered remotely when a site has the Drupal 8 RESTful Web Services (rest) core module enabled and accepts PATCH or POST requests, or when other web services modules are enabled, such as JSON:API on Drupal 8 or the Services and RESTful Web Services contributed modules on Drupal 7. A successful attack yields unauthenticated remote code execution with high impact on confidentiality, integrity, and availability, typically running as the web server user. Only Drupal sites meeting the web-services conditions are affected: Drupal 8 sites running versions before 8.5.11 or 8.6.10, and Drupal 7 sites using the Services or RESTful Web Services contributed modules. The flaw has public proof-of-concept exploits on Exploit-DB, was reported as under active exploitation shortly after disclosure, and is listed in CISA's Known Exploited Vulnerabilities catalog (added 2022-03-25). Do: Upgrade Drupal 8 core to 8.5.11 or later, or 8.6.10 or later, per vendor instructions. If patching is not immediately possible, disable the RESTful Web Services and JSON:API modules or restrict untrusted PATCH/POST requests to their endpoints; Drupal 7 sites using Services or RESTful Web Services should apply the contributed module updates from this advisory. Review web server and module logs for suspicious POST/PATCH requests to REST or JSON:API routes as evidence of compromise. | 8.1 | 92% | KEV PoC ×2 |
| largeroughly 10,000–100,000 sites plausibly exposed (a subset of the hundreds of thousands of Drupal 8 deployments, limited to those with REST/JSON:API web services… |
Full article316 words · extracted from securityaffairs.com · click to collapse
Pierluigi Paganini
February 21, 2019
Security expert found a “highly critical” vulnerability (CVE-2019-6340) in the popular Drupal CMS that could be exploited for remote code execution.
Drupal released security updates that addresses a “highly critical” vulnerability in the popular Drupal CMS, tracked as CVE-2019-6340, that could be exploited for remote code execution.
The CVE-2019-6340 flaw is caused by the lack of proper data sanitization in some field types, an attacker could exploit the flaw to execute arbitrary PHP code.
“Some field types do not properly sanitize data from non-form sources. This can lead to arbitrary PHP code execution in some cases.” reads the security advisory published by Drupal.
The flaw was discovered by Samuel Mortenson of the Drupal Security Team.
In order to exploit the CVE-2019-6340 flaw, it is necessary that the core RESTful Web Services module is enabled and allows PATCH or POST requests. It is also possible to trigger the vulnerability if another web services module is enabled, such as JSON:API in Drupal 8 or RESTful Web Services or Services in Drupal 7.
Drupal released Drupal 8.6.10 and 8.5.11 to address the vulnerability. Drupal 7 does not need to be updated, but experts pointed out that there are some updates for Drupal 7 contributed modules that should be installed.
“To immediately mitigate the vulnerability, you can disable all web services modules, or configure your web server(s) to not allow PUT/PATCH/POST requests to web services resources,” continues the advisory.
“Note that web services resources may be available on multiple paths depending on the configuration of your server(s). For Drupal 7, resources are for example typically available via paths (clean URLs) and via arguments to the ‘q’ query argument. For Drupal 8, paths may still function when prefixed with index.php/.”
Drupal users must install the updates as soon as possible.
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(SecurityAffairs – Drupal, RCE)
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Text extracted automatically; images, tables and formatting may be missing. Original: https://securityaffairs.com/81461/hacking/drupal-cve-2019-6340-rce.html