CVE Vulnerabilities


Incorrect Permission Assignment for Critical Resource

Published: Sep 25, 2017 | Modified: Oct 03, 2019
CVSS 3.x
CVSS 2.x
7.2 HIGH

The init script in the Gentoo app-admin/logstash-bin package before 5.5.3 and 5.6.x before 5.6.1 has chown -R calls for user-writable directory trees, which allows local users to gain privileges by leveraging access to a $LS_USER account for creation of a hard link.


The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.

Affected Software

Name Vendor Start Version End Version
Logstash Elasticsearch 5.0.0 (including) 5.0.0 (including)
Logstash Elasticsearch 5.0.1 (including) 5.0.1 (including)
Logstash Elasticsearch 5.0.2 (including) 5.0.2 (including)
Logstash Elasticsearch 5.1.1 (including) 5.1.1 (including)
Logstash Elasticsearch 5.1.2 (including) 5.1.2 (including)
Logstash Elasticsearch 5.2.0 (including) 5.2.0 (including)
Logstash Elasticsearch 5.2.1 (including) 5.2.1 (including)
Logstash Elasticsearch 5.3.0 (including) 5.3.0 (including)
Logstash Elasticsearch 5.3.1 (including) 5.3.1 (including)
Logstash Elasticsearch 5.3.2 (including) 5.3.2 (including)
Logstash Elasticsearch 5.4.1 (including) 5.4.1 (including)
Logstash Elasticsearch 5.4.2 (including) 5.4.2 (including)
Logstash Elasticsearch 5.4.3 (including) 5.4.3 (including)
Logstash Elasticsearch 5.5.0 (including) 5.5.0 (including)
Logstash Elasticsearch 5.5.1 (including) 5.5.1 (including)
Logstash Elasticsearch 5.5.2 (including) 5.5.2 (including)
Logstash Elasticsearch 5.6.0 (including) 5.6.0 (including)

Potential Mitigations

  • Run the code in a “jail” or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which files can be accessed in a particular directory or which commands can be executed by the software.
  • OS-level examples include the Unix chroot jail, AppArmor, and SELinux. In general, managed code may provide some protection. For example, in the Java SecurityManager allows the software to specify restrictions on file operations.
  • This may not be a feasible solution, and it only limits the impact to the operating system; the rest of the application may still be subject to compromise.
  • Be careful to avoid CWE-243 and other weaknesses related to jails.