Vulnerability identifier: #VU48685
Vulnerability risk: Medium
CVSSv3.1: 5 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-20
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Synapse
Server applications /
Conferencing, Collaboration and VoIP solutions
Vendor: Matrix.org
Description
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to the application erroneously permits non-standard NaN, Infinity, and -Infinity JSON values in fields of m.room.member events, allowing remote attackers to execute a denial of service attack against the federation and common Matrix clients. If such a malformed event is accepted into the room's state, the impact is long-lasting and is not fixed by an upgrade to a newer version, requiring the event to be manually redacted instead. Since events are replicated to servers of other room members, the impact is not constrained to the server of the event sender.
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-4mp3-385r-v63f
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.