ZNC up to 1.7.0 Web Skin Name path traversal

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5.8$0-$5k0.00

A vulnerability was found in ZNC up to 1.7.0 and classified as critical. Affected by this issue is an unknown function of the component Web Skin Name Handler. The manipulation with the input value ../ leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, and integrity. CVE summarizes:

ZNC before 1.7.1-rc1 is prone to a path traversal flaw via ../ in a web skin name to access files outside of the intended skins directories.

The bug was discovered 07/14/2018. The weakness was presented 07/15/2018 (Website). The advisory is available at github.com. This vulnerability is handled as CVE-2018-14056 since 07/14/2018. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

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 176435 (Debian Security Update for znc (DSA 4252-1)).

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). See VDB-121477 for similar entry.

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Path traversal
CWE: CWE-22
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 111175
Nessus Name: Debian DSA-4252-1 : znc - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
Exposure Time: 🔍

Upgrade: ZNC 1.7.1-rc1
Patch: github.com

Timelineinfo

07/14/2018 🔍
07/14/2018 +0 days 🔍
07/14/2018 +0 days 🔍
07/15/2018 +1 days 🔍
07/15/2018 +0 days 🔍
07/18/2018 +3 days 🔍
07/20/2018 +2 days 🔍
04/09/2023 +1724 days 🔍

Sourcesinfo

Advisory: a4a5aeeb17d32937d8c7d743dae9a4cc755ce773
Status: Not defined

CVE: CVE-2018-14056 (🔍)
OVAL: 🔍
See also: 🔍

Entryinfo

Created: 07/15/2018 04:34 PM
Updated: 04/09/2023 09:33 AM
Changes: 07/15/2018 04:34 PM (73), 03/05/2020 09:33 AM (2), 04/09/2023 09:33 AM (5)
Complete: 🔍
Cache ID: 18:9E5:40

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