#VU18315 Input validation error in ZNC - CVE-2019-9917

Vulnerability identifier: #VU18315

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-9917

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ZNC
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: ZNC

Description

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

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can send a specially crafted message in incorrect encoding and cause the application to crash.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ZNC: 1.7.0 - 1.7.3

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External links
https://github.com/znc/znc/commit/64613bc8b6b4adf1e32231f9844d99cd512b8973
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7WTRBTPL7WWKQ7DZ2ALDTCGYUWSE6SL3/

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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.