This security advisory describes one medium risk vulnerability.
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to the application does not remove local threepids upon user deactivation and allows access for deactivated accounts.The problem resides within the "/synapse/storage/data_stores/main/registration.py" and "/synapse/handlers/deactivate_account.py" scripts.
A remote attacker can bypass authentication and gain unauthorized access to the application.
Install updates from vendor's website.Vulnerable software versions
Synapse: 1.5.0, 1.5.0rc1, 1.5.0rc2, 1.5.1, 1.6.0CPE
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.