CVE-2022-43947 : Vulnerability Insights and Analysis

An improper restriction of excessive authentication attempts vulnerability in Fortinet FortiOS and FortiProxy allows attackers to perform brute-force attacks on user accounts via valid login sessions.

Understanding CVE-2022-43947

This CVE identifies an improper restriction of excessive authentication attempts vulnerability affecting Fortinet FortiOS and FortiProxy.

What is CVE-2022-43947?

CVE-2022-43947 is an improper restriction of excessive authentication attempts vulnerability in Fortinet FortiOS version 7.2.0 through 7.2.3 and before 7.0.10, as well as in FortiProxy version 7.2.0 through 7.2.1 and before 7.0.7. This vulnerability allows an attacker with a valid user account to conduct brute-force attacks on other user accounts by injecting valid login sessions.

The Impact of CVE-2022-43947

The vulnerability poses a medium-severity risk with a CVSS base score of 4.7. Attackers can exploit this flaw to perform brute-force attacks, potentially compromising the confidentiality and integrity of user accounts.

Technical Details of CVE-2022-43947

This section delves into the specifics of the vulnerability.

Vulnerability Description

The vulnerability arises from an improper restriction of excessive authentication attempts, enabling attackers to abuse valid user sessions for brute-force attacks on other accounts.

Affected Systems and Versions

Fortinet FortiOS versions 7.2.0 to 7.2.3 (pre-7.0.10) and FortiProxy versions 7.2.0 to 7.2.2 (pre-7.0.8) are affected by this vulnerability.

Exploitation Mechanism

Attackers with valid user accounts can inject authorized login sessions to perform brute-force attacks on other user accounts, exploiting the lack of proper access controls.

Mitigation and Prevention

Protecting systems from CVE-2022-43947 involves taking immediate steps and implementing long-term security practices.

Immediate Steps to Take

Users are advised to upgrade to secure versions to mitigate the vulnerability. For FortiProxy, upgrade to version 7.2.2 or higher, or version 7.0.8 or higher. For FortiOS, update to version 7.2.4, 7.0.11, or 6.4.13.

Long-Term Security Practices

To enhance security posture, organizations should enforce strong access controls, monitor login attempts, and conduct regular security audits.

Patching and Updates

Regularly applying security patches and updates from Fortinet is crucial to address known vulnerabilities.