#VU33178 Input validation error in mumble - CVE-2018-20743

Vulnerability identifier: #VU33178

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-20743

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
mumble
Other software / Other software solutions

Vendor: wiki.mumble.info

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

murmur in Mumble through 1.2.19 before 2018-08-31 mishandles multiple concurrent requests that are persisted in the database, which allows remote attackers to cause a denial of service (daemon hang or crash) via a message flood.

Mitigation
Install update from vendor's website.

Vulnerable software versions

mumble: 1.2.10 - 1.2.17

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External links
https://lists.opensuse.org/opensuse-security-announce/2019-07/msg00045.html
https://lists.opensuse.org/opensuse-security-announce/2019-08/msg00023.html
https://lists.opensuse.org/opensuse-security-announce/2020-01/msg00058.html
https://bugs.debian.org/919249
https://github.com/mumble-voip/mumble/issues/3505
https://github.com/mumble-voip/mumble/pull/3510
https://github.com/mumble-voip/mumble/pull/3512
https://lists.debian.org/debian-lts-announce/2019/02/msg00006.html
https://www.debian.org/security/2019/dsa-4402

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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.