Security restrictions bypass in Matrix Synapse



Published: 2018-08-07
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2018-12291
CWE-ID CWE-264
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 one low risk vulnerability.

1) Security restrictions bypass

EUVDB-ID: #VU14207

Risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-12291

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The vulnerability exists in the on_get_missing_events function in handlers/federation.py due to event visibility rules were not applied correctly. A remote unauthenticated attacker can bypass security restrictions and conduct further attacks.

Mitigation

Update to version 0.31.1.

Vulnerable software versions

Synapse: 0.11.1 - 0.31.0

CPE2.3 External links

http://github.com/matrix-org/synapse/pull/3371


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.



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