Vulnerability identifier: #VU29532

Vulnerability risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-13775

CWE-ID: CWE-476

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 user to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error. A remote authenticated user can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Successful exploitation of the vulnerability requires that the echo-message is not enabled and there is no network.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ZNC: 1.8.0

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External links
http://github.com/znc/znc/commit/2390ad111bde16a78c98ac44572090b33c3bd2d8
http://github.com/znc/znc/commit/d229761821da38d984a9e4098ad96842490dc001
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DNVBE4T2DRJRQHFRMHYBTN4OSOL6DBHR/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HS3DWGXLVRROQQA57UIPMDM6XMVEMBRA/

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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.