ZNC up to 1.7.2 Encoding input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in ZNC up to 1.7.2. This vulnerability affects unknown code of the component Encoding Handler. Such manipulation leads to input validation. This vulnerability is documented as CVE-2019-9917. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in ZNC up to 1.7.2 and classified as problematic. Affected by this issue is an unknown functionality of the component Encoding Handler. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to 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. Impacted is availability. CVE summarizes:

ZNC before 1.7.3-rc1 allows an existing remote user to cause a Denial of Service (crash) via invalid encoding.

The bug was discovered 03/15/2019. The weakness was released 03/27/2019 (Website). The advisory is shared for download at seclists.org. This vulnerability is handled as CVE-2019-9917 since 03/21/2019. The exploitation is known to be easy. The attack may be launched remotely. The successful exploitation needs a simple authentication. There are neither technical details nor an exploit publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 12 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 257935 (Linux Distros Unpatched Vulnerability : CVE-2019-9917), which helps to determine the existence of the flaw in a target environment. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176981 (Debian Security Update for znc (DSA 4463-1)).

Upgrading to version 1.7.3-rc1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (257935). Entry connected to this vulnerability is available at VDB-136524. Once again VulDB remains the best source for vulnerability data.

Productinfo

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 257935
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2019-9917

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: ZNC 1.7.3-rc1
Patch: github.com

Timelineinfo

03/15/2019 🔍
03/21/2019 +6 days 🔍
03/27/2019 +6 days 🔍
03/27/2019 +0 days 🔍
08/30/2025 +2348 days 🔍

Sourcesinfo

Product: github.com

Advisory: 64613bc8b6b4adf1e32231f9844d99cd512b8973
Status: Confirmed

CVE: CVE-2019-9917 (🔍)
GCVE (CVE): GCVE-0-2019-9917
GCVE (VulDB): GCVE-100-132476
See also: 🔍

Entryinfo

Created: 03/27/2019 13:54
Updated: 08/30/2025 09:57
Changes: 03/27/2019 13:54 (58), 05/21/2020 20:45 (2), 08/08/2023 16:52 (5), 08/08/2023 16:59 (1), 08/30/2025 09:57 (17)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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