Multiple vulnerabilities in ZNC

Published: 2018-07-30

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-14055 CVE-2018-14056
CWE-ID	CWE-20 CWE-22
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	ZNC Server applications / IDS/IPS systems, Firewalls and proxy servers
Vendor	ZNC

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper input validation

EUVDB-ID: #VU14122

Risk: Low

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-14055

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

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

External links

http://github.com/znc/znc/commit/d22fef8620cdd87490754f607e7153979731c69d
http://github.com/znc/znc/commit/a7bfbd93812950b7444841431e8e297e62cb524e

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Path traversal

EUVDB-ID: #VU14123