VDB-245687 · CVE-2023-38320 · EUVD-2023-42139

OpenNDS up to 10.1.1 HTTP GET show_preauthpage null pointer dereference

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.4	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in OpenNDS up to 10.1.1. This affects the function show_preauthpage of the component HTTP GET Handler. The manipulation leads to null pointer dereference. This vulnerability is uniquely identified as CVE-2023-38320. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in OpenNDS up to 10.1.1 and classified as problematic. This issue affects the function show_preauthpage of the component HTTP GET Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

An issue was discovered in OpenNDS Captive Portal before version 10.1.2. It has a show_preauthpage NULL pointer dereference that can be triggered with a crafted GET HTTP with a missing User-Agent header. Triggering this issue results in crashing OpenNDS (a Denial-of-Service condition).

The weakness was disclosed 11/17/2023. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2023-38320 since 07/14/2023. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 10.1.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-42139). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

OpenNDS

Version

Website

Product: https://github.com/openNDS/openNDS/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: OpenNDS 10.1.2

Timelineinfo

07/14/2023 🔍
11/17/2023 +126 days 🔍
11/17/2023 +0 days 🔍
01/19/2026 +794 days 🔍

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2023-38320 (🔍)
GCVE (CVE): GCVE-0-2023-38320
GCVE (VulDB): GCVE-100-245687
EUVD: 🔍

Entryinfo

Created: 11/17/2023 07:04
Updated: 01/19/2026 04:36
Changes: 11/17/2023 07:04 (40), 12/13/2023 00:47 (1), 12/13/2023 00:56 (11), 06/20/2024 22:11 (15), 01/19/2026 04:36 (2)
Complete: 🔍
Cache ID: 216::103