CVE-2017-11156 Explained : Impact and Mitigation
Learn about CVE-2017-11156 affecting Synology Download Station versions 3.8.x before 3.8.5-3475 and 3.x before 3.5-2984. Find out how authenticated remote users can execute arbitrary code.
Synology Download Station 3.8.x before 3.8.5-3475 and 3.x before 3.5-2984 has a vulnerability due to weak permissions, allowing remote authenticated users to execute arbitrary code.
Understanding CVE-2017-11156
This CVE involves a security vulnerability in Synology Download Station that could be exploited by authenticated remote users.
What is CVE-2017-11156?
The vulnerability in Synology Download Station allows attackers to execute arbitrary code by leveraging weak permissions in a specific directory.
The Impact of CVE-2017-11156
The vulnerability enables authenticated remote users to upload and execute malicious executables, potentially leading to unauthorized access and control of the affected system.
Technical Details of CVE-2017-11156
This section provides more in-depth technical details of the CVE.
Vulnerability Description
Weak permissions (0777) in the directory ui/dlm/btsearch of Synology Download Station versions 3.8.x before 3.8.5-3475 and 3.x before 3.5-2984 allow for the execution of arbitrary code.
Affected Systems and Versions
- Product: Synology Download Station
- Vendor: Synology
- Vulnerable Versions: 3.8.x before 3.8.5-3475 and 3.x before 3.5-2984
Exploitation Mechanism
Attackers can exploit this vulnerability by uploading an executable through unspecified means, taking advantage of the weak permissions in the specified directory.
Mitigation and Prevention
Protecting systems from CVE-2017-11156 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update Synology Download Station to the latest patched version.
- Monitor and restrict file upload permissions within the application.
- Implement strong authentication mechanisms to prevent unauthorized access.
Long-Term Security Practices
- Regularly audit and review file permissions on the server.
- Conduct security training for users to recognize and report suspicious activities.
Patching and Updates
- Apply security patches provided by Synology promptly to address the vulnerability and enhance system security.