A vulnerability was found in Synology DNS Server up to 2.2.1 and classified as critical. Affected by this issue is an unknown part of the component SYNO.DNSServer.Zone.MasterZoneConf. The manipulation of the argument domain_name with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is integrity, and availability. CVE summarizes:

Directory traversal vulnerability in the SYNO.DNSServer.Zone.MasterZoneConf in Synology DNS Server before 2.2.1-3042 allows remote authenticated attackers to write arbitrary files via the domain_name parameter.

The bug was discovered 08/23/2017. The weakness was published 08/24/2017 (Website). The advisory is available at synology.com. This vulnerability is handled as CVE-2017-12074 since 07/31/2017. The attack may be launched remotely. A simple authentication is necessary for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 2.2.1-3042 eliminates this vulnerability.

Productinfo

Vendor

• Synology

Name

• DNS Server

Version

• 2.2.0
• 2.2.1

License

• commercial

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

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