CVE-2021-33181 Explained : Impact and Mitigation
Learn about CVE-2021-33181, an SSRF vulnerability in Synology Video Station allowing remote authenticated users to manipulate requests to internal resources. Find mitigation steps here.
A Server-Side Request Forgery (SSRF) vulnerability in the webapi component of Synology Video Station before version 2.4.10-1632 allows remote authenticated users to send arbitrary requests to intranet resources. This CVE was published on May 26, 2021, with a CVSS base score of 6.6.
Understanding CVE-2021-33181
This section will provide insight into the vulnerability, its impact, technical details, and mitigation steps.
What is CVE-2021-33181?
The CVE-2021-33181 involves an SSRF vulnerability in the webapi component of Synology Video Station, enabling authenticated remote users to send unauthorized requests to internal network resources.
The Impact of CVE-2021-33181
The vulnerability's low attack complexity and network access requirement make it feasible for intruders to exploit, posing a medium-severity risk. It can lead to unauthorized access to sensitive data or disruption of service.
Technical Details of CVE-2021-33181
This section delves deeper into the technical aspects of the vulnerability, affected systems, and exploitation mechanisms.
Vulnerability Description
The vulnerability allows authenticated remote users to trigger SSRF attacks, sending malicious requests to internal network resources via unspecified vectors.
Affected Systems and Versions
The affected product is Synology Video Station, specifically versions prior to 2.4.10-1632. Users with these versions are at risk of SSRF exploitation.
Exploitation Mechanism
By leveraging the SSRF vulnerability, attackers can manipulate the webapi component to direct arbitrary requests to intranet resources, bypassing security controls.
Mitigation and Prevention
This section outlines the immediate steps to take and long-term security practices to mitigate the risks associated with CVE-2021-33181.
Immediate Steps to Take
Users should update Synology Video Station to version 2.4.10-1632 or higher to patch the vulnerability. Additionally, restrict network access to the service to trusted entities only.
Long-Term Security Practices
Implementing strict access controls, regularly updating software, and monitoring network traffic can enhance overall security posture.
Patching and Updates
Regularly check for security advisories from Synology and apply patches promptly to protect against known vulnerabilities.