CVE-2017-16933 : Security Advisory and Response
Learn about CVE-2017-16933 affecting Icinga versions 2.x up to 2.8.1. Discover how local users can exploit a vulnerability to elevate privileges within Icinga software. Find mitigation steps and best practices for enhanced security.
CVE-2017-16933 was published on November 24, 2017, and affects Icinga versions 2.x up to 2.8.1. The vulnerability allows local users to elevate their privileges by exploiting a specific file within the Icinga software.
Understanding CVE-2017-16933
This CVE entry highlights a security issue within Icinga that could potentially lead to privilege escalation for local users.
What is CVE-2017-16933?
The file "etc/initsystem/prepare-dirs" in Icinga versions 2.x up to 2.8.1 contains a vulnerability that enables local users to elevate their privileges by utilizing the $ICINGA2_USER account's access to create a symbolic link.
The Impact of CVE-2017-16933
The vulnerability in Icinga versions 2.x up to 2.8.1 allows local users to exploit a chown command in a user-writable directory, leading to privilege escalation.
Technical Details of CVE-2017-16933
This section provides more in-depth technical details about the vulnerability.
Vulnerability Description
The vulnerability lies in the chown call for a filename in a user-writable directory within Icinga 2.x through 2.8.1, enabling local users to gain privileges by leveraging access to the $ICINGA2_USER account for creating a link.
Affected Systems and Versions
- Product: Icinga
- Vendor: N/A
- Versions affected: 2.x up to 2.8.1
Exploitation Mechanism
Local users can exploit the vulnerability by manipulating the chown command in the specified file to create a symbolic link, thereby elevating their privileges.
Mitigation and Prevention
To address CVE-2017-16933 and enhance security, follow these mitigation steps:
Immediate Steps to Take
- Apply the latest patches and updates from Icinga.
- Restrict access to sensitive directories to authorized users only.
Long-Term Security Practices
- Regularly monitor and audit user permissions and activities.
- Educate users on best security practices to prevent privilege escalation.
Patching and Updates
- Stay informed about security advisories from Icinga and promptly apply patches to mitigate vulnerabilities.