CVE-2018-12423 : Security Advisory and Response
Learn about CVE-2018-12423, a vulnerability in Synapse versions before 0.31.2 allowing unauthorized room control. Find mitigation steps and long-term security practices.
Synapse versions before 0.31.2 allow unauthorized users to take control of rooms in the absence of an active m.room.power_levels event.
Understanding CVE-2018-12423
This CVE describes a vulnerability in Synapse versions prior to 0.31.2 that enables unauthorized users to hijack rooms without the necessary permissions.
What is CVE-2018-12423?
In Synapse versions before 0.31.2, unauthorised users can exploit a flaw that allows them to take control of rooms when there is no m.room.power_levels event enforced.
The Impact of CVE-2018-12423
This vulnerability can lead to unauthorized access and manipulation of rooms within the Synapse platform, potentially compromising the integrity and confidentiality of the communication within those rooms.
Technical Details of CVE-2018-12423
This section provides more in-depth technical insights into the CVE.
Vulnerability Description
Users who lack authorization can exploit the vulnerability to gain control of rooms in Synapse versions before 0.31.2, specifically when there is no active m.room.power_levels event present.
Affected Systems and Versions
- Vulnerable Systems: Synapse versions before 0.31.2
- Affected Versions: All versions preceding 0.31.2
Exploitation Mechanism
The vulnerability allows unauthorized users to manipulate rooms by bypassing the necessary permission levels, leading to potential room hijacking.
Mitigation and Prevention
Protecting systems from CVE-2018-12423 is crucial to maintaining security.
Immediate Steps to Take
- Upgrade Synapse to version 0.31.2 or newer to mitigate the vulnerability.
- Implement proper access controls and permissions within Synapse configurations.
Long-Term Security Practices
- Regularly update and patch Synapse to ensure the latest security fixes are in place.
- Conduct security audits to identify and address any potential vulnerabilities proactively.
Patching and Updates
- Stay informed about security updates and patches released by Synapse to address known vulnerabilities promptly.