CVE-2017-12074 : Exploit Details and Defense Strategies

The Synology DNS Server before version 2.2.1-3042 is affected by a directory traversal vulnerability that allows remote authenticated attackers to write arbitrary files. This CVE was published on August 23, 2017, by Synology.

Understanding CVE-2017-12074

What is CVE-2017-12074?

CVE-2017-12074 is a directory traversal vulnerability in the SYNO.DNSServer.Zone.MasterZoneConf in Synology DNS Server before version 2.2.1-3042. It enables remote authenticated attackers to write arbitrary files by exploiting the domain_name parameter.

The Impact of CVE-2017-12074

This vulnerability poses a security risk as attackers can manipulate the domain_name parameter to write unauthorized files on the system, potentially leading to further exploitation or data compromise.

Technical Details of CVE-2017-12074

Vulnerability Description

The vulnerability in Synology DNS Server before version 2.2.1-3042 allows remote authenticated attackers to perform directory traversal and write arbitrary files via the domain_name parameter.

Affected Systems and Versions

Affected Product: Synology DNS Server
Vendor: Synology
Vulnerable Versions: Before 2.2.1-3042

Exploitation Mechanism

Attackers can exploit the directory traversal vulnerability by manipulating the domain_name parameter, enabling them to write unauthorized files on the system.

Mitigation and Prevention

Immediate Steps to Take

Update Synology DNS Server to version 2.2.1-3042 or later to mitigate the vulnerability.
Monitor system logs for any suspicious activities related to file manipulation.

Long-Term Security Practices

Implement strong authentication mechanisms to prevent unauthorized access to the server.
Regularly audit and review file read/write permissions to restrict access.

Patching and Updates

Stay informed about security updates and patches released by Synology for the DNS Server.
Apply patches promptly to ensure the system is protected against known vulnerabilities.