CVE-2021-32598 : Security Advisory and Response

This article provides insights into CVE-2021-32598, an improper neutralization of CRLF sequences vulnerability affecting Fortinet FortiManager and FortiAnalyzer.

Understanding CVE-2021-32598

CVE-2021-32598 is a security vulnerability in Fortinet FortiManager and FortiAnalyzer that allows attackers to perform HTTP request splitting attacks, potentially gaining control over response headers and body.

What is CVE-2021-32598?

CVE-2021-32598 involves improper neutralization of CRLF sequences in HTTP headers, leading to HTTP Response Splitting in Fortinet FortiManager and FortiAnalyzer GUI versions 7.0.0, 6.4.6 and below, 6.2.8 and below, 6.0.11 and below, and 5.6.11 and below. This flaw can be exploited by authenticated remote attackers.

The Impact of CVE-2021-32598

The impact of this vulnerability is rated as medium severity. Attackers could potentially execute unauthorized commands, compromising the integrity of affected systems. However, the exploit code maturity is unproven.

Technical Details of CVE-2021-32598

CVE-2021-32598 has a CVSS v3.1 base score of 4.3 (medium severity) with a low attack complexity and vector being network-based. The vulnerability does not require special user privileges for exploitation.

Vulnerability Description

The vulnerability in Fortinet FortiManager and FortiAnalyzer allows for HTTP request splitting, enabling attackers to manipulate response headers and body content.

Affected Systems and Versions

FortiManager versions 7.0.0, 6.4.6 and below, 6.2.8 and below, 6.0.11 and below, 5.6.11 and below; FortiAnalyzer versions 7.0.0, 6.4.6 and below, 6.2.8 and below, 6.0.11 and below, 5.6.11 and below are affected by this vulnerability.

Exploitation Mechanism

Authenticated remote attackers can exploit this vulnerability to perform HTTP request splitting attacks, potentially taking control of response headers and body.

Mitigation and Prevention

To mitigate the risk associated with CVE-2021-32598, immediate actions should be taken to secure affected Fortinet products.

Immediate Steps to Take

Fortinet users are advised to apply security patches released by the vendor promptly to address this vulnerability and prevent potential exploitation.

Long-Term Security Practices

Implementing strong network security measures, including access controls and monitoring, can help prevent unauthorized access and manipulation of HTTP responses.

Patching and Updates

Regularly check for and apply security updates provided by Fortinet to ensure the latest protections against vulnerabilities like CVE-2021-32598.