ZNC up to 1.7.0 Line znc.conf input validation

Summaryinfo

A vulnerability classified as critical has been found in ZNC up to 1.7.0. This issue affects some unknown processing of the file znc.conf of the component Line Handler. This manipulation causes input validation. This vulnerability is tracked as CVE-2018-14055. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in ZNC up to 1.7.0 and classified as critical. Affected by this vulnerability is some unknown processing of the file znc.conf of the component Line Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

ZNC before 1.7.1-rc1 does not properly validate untrusted lines coming from the network, allowing a non-admin user to escalate his privilege and inject rogue values into znc.conf.

The bug was discovered 07/14/2018. The weakness was disclosed 07/15/2018 (Website). The advisory is shared at github.com. This vulnerability is known as CVE-2018-14055 since 07/14/2018. The exploitation appears to be easy. The attack can be launched remotely. Required for exploitation is a single authentication. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 111175 (Debian DSA-4252-1 : znc - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171413 (OpenSUSE Security Update for znc (openSUSE-SU-2018:2231-1)).

Upgrading to version 1.7.1-rc1 eliminates this vulnerability. A possible mitigation has been published 3 days after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (111175). The entry VDB-121478 is pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• ZNC

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7.0

License

• open-source

Website

• Product: https://github.com/znc/znc/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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