#VU14122 Improper input validation in ZNC - CVE-2018-14055

Vulnerability identifier: #VU14122

Vulnerability risk: Low

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-14055

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 gain elevated privileges on the target system.

The vulnerability exists due to improper validation of untrusted lines coming from the network. A remote unauthenticated attacker can supply specially crafted input to inject rogue values into znc.conf and gain elevated privileges.

Mitigation
Update to version 1.7.1.

Vulnerable software versions

ZNC: 1.0 - 1.7.0

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External links
https://github.com/znc/znc/commit/d22fef8620cdd87490754f607e7153979731c69d
https://github.com/znc/znc/commit/a7bfbd93812950b7444841431e8e297e62cb524e

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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.