Input validation error in Eclipse Mosquitto

1) Input validation error

EUVDB-ID: #VU33762

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-7652

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote authenticated user to execute arbitrary code.

In Eclipse Mosquitto 1.4.14, if a Mosquitto instance is set running with a configuration file, then sending a HUP signal to server triggers the configuration to be reloaded from disk. If there are lots of clients connected so that there are no more file descriptors/sockets available (default limit typically 1024 file descriptors on Linux), then opening the configuration file will fail.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Eclipse Mosquitto: 1.4.14

External links

http://bugs.eclipse.org/bugs/show_bug.cgi?id=530102
http://lists.debian.org/debian-lts-announce/2018/03/msg00037.html
http://lists.debian.org/debian-lts-announce/2018/06/msg00016.html
http://mosquitto.org/blog/2018/02/security-advisory-cve-2017-7651-cve-2017-7652/
http://www.debian.org/security/2018/dsa-4325

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.