CVE-2023-42782 : Vulnerability Insights and Analysis

This article provides detailed information about CVE-2023-42782, including its description, impact, technical details, mitigation, and prevention methods.

Understanding CVE-2023-42782

CVE-2023-42782 is an insufficient verification of data authenticity vulnerability in FortiAnalyzer versions 7.4.0 and below 7.2.3, allowing a remote unauthenticated attacker to send messages to the syslog server of FortiAnalyzer.

What is CVE-2023-42782?

CVE-2023-42782 is classified as an improper access control vulnerability (CWE-345) affecting FortiAnalyzer, potentially exploited by unauthorized remote attackers.

The Impact of CVE-2023-42782

This vulnerability could be exploited by unauthorized remote attackers to send messages to the syslog server of FortiAnalyzer using an authorized device serial number, posing a risk to the integrity of the system.

Technical Details of CVE-2023-42782

The vulnerability has a CVSS base score of 5.0 (Medium severity) with attack complexity LOW and attack vector NETWORK. The integrity impact is LOW, and no user interaction or privileges are required for exploitation.

Vulnerability Description

The vulnerability in FortiAnalyzer versions 7.4.0 and below 7.2.3 allows remote unauthenticated attackers to send messages to the syslog server via an authorized device serial number.

Affected Systems and Versions

FortiAnalyzer version 7.4.0
FortiAnalyzer versions less than or equal to 7.2.3
FortiAnalyzer versions less than or equal to 7.0.9
FortiAnalyzer versions less than or equal to 6.4.13
FortiAnalyzer versions less than or equal to 6.2.12

Exploitation Mechanism

Remote unauthenticated attackers exploit the vulnerability by using the knowledge of an authorized device serial number to send messages to the syslog server of FortiAnalyzer.

Mitigation and Prevention

To mitigate the CVE-2023-42782 vulnerability in FortiAnalyzer, users are advised to take the following steps:

Immediate Steps to Take

Upgrade to FortiAnalyzer version 7.4.1 or above
Upgrade to FortiAnalyzer version 7.2.4 or above
Configure the "un-encrypted-logging" option to disable receiving syslog without encryption through UDP(514) or TCP(514).

Long-Term Security Practices

Implement strict access controls and regularly update the FortiAnalyzer software to the latest version to protect against potential security threats.

Patching and Updates

Stay informed about security updates and patches released by Fortinet to address security vulnerabilities such as CVE-2023-42782.