Authentication bypass in Synapse

Published: 2019-11-29 | Updated: 2019-11-29
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID N/A
CWE ID CWE-287
Exploitation vector Network
Public exploit N/A
Vulnerable software Synapse Subscribe
Vendor Matrix.org

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Improper Authentication

Severity: Medium

CVSSv3: 4.2 [CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: N/A

CWE-ID: CWE-287 - Improper Authentication

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Synapse: 1.5.0, 1.5.0rc1, 1.5.0rc2, 1.5.1, 1.6.0

CPE External links

https://github.com/matrix-org/synapse/releases/tag/v1.6.1

Q & A

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.