Multiple vulnerabilities in Matrix Synapse

Published: 2021-09-01

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-39164 CVE-2021-39163
CWE-ID	CWE-200
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Synapse Server applications / Conferencing, Collaboration and VoIP solutions
Vendor	Matrix.org

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Information disclosure

EUVDB-ID: #VU56225

Risk: Low

CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-39164

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application. A remote authenticated attacker can gain unauthorized access to sensitive information on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Synapse: 0.0.0 - 2.20.15.1104

External links

http://github.com/matrix-org/synapse/security/advisories/GHSA-3x4c-pq33-4w3q
http://github.com/matrix-org/synapse/releases/tag/v1.41.1
http://github.com/matrix-org/synapse/commit/cb35df940a

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Information disclosure

EUVDB-ID: #VU56226