External risk intelligence

Fortinet FortiOS File Read and Write Vulnerability.

CVE advisoryKnown Exploit

CVE-2022-41328

A vulnerability in Fortinet FortiOS permits a privileged attacker to read and write system files. This could affect organizational data confidentiality and integrity. The realistic business risk involves unauthorized file access or modification via crafted commands.

1Halo Surface Signal

Path Traversal

Fortinet Fortios

6.0.0 to 6.0.166.2.0 to before 6.2.146.4.0 to before 6.4.127.0.0 to before 7.0.107.2.0 to before 7.2.4

External exposure likelihood

Halo Surface Signal score for CVE-2022-41328

The vulnerability requires a privileged attacker to execute specific CLI commands on the underlying system. Command-line interface access is typically restricted to authorized administrators and is not exposed to the public internet in standard deployment patterns.

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability in Fortinet FortiOS allows a privileged attacker to read and write files on the underlying system. This occurs due to an improper limitation of a pathname to a restricted directory. The potential impact includes unauthorized modification or access to sensitive system files, posing a risk to organizational data integrity and security.

Vulnerable Fortinet FortiOS systems.
Path traversal flaw.
Unauthorized file access/modification.

Attack Path

How an attacker could exploit the issue

This vulnerability allows a privileged attacker to read and write files on the underlying Linux system. The attack requires the attacker to have existing access to the system's command-line interface. By using specially crafted commands, the attacker can exploit a path traversal weakness to manipulate files outside of their intended directories. This could lead to unauthorized data modification or exposure.

Requires privileged CLI access.
Attacker uses crafted CLI commands.
Results in unauthorized file read/write.

Live Threat

Current exploitation, exposure, and threat context

A vulnerability exists in Fortinet FortiOS that could allow a privileged attacker to read and write files on the system. This could impact the confidentiality and integrity of data and underlying system operations. Organizations should assess their exposure and consider remediation based on the potential impact.

Likely attacker skill level: Privileged access required.
Required access or conditions: Local privileged access to the system.
Business risk or urgency: Potential data compromise and system impact.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability allows a privileged attacker to read and write files on the underlying Linux system through crafted commands. This could impact system integrity and data confidentiality for affected organizations.

Identify affected systems.
Isolate or restrict access.
Apply vendor fix and verify.
Monitor for related activity.

Frequently asked questions

What is Fortinet FortiOS?

FortiOS is the operating system for Fortinet's FortiGate network security platform, acting as the core of the Fortinet Security Fabric. It integrates various security and networking functions, such as firewalls, VPNs, and intrusion prevention, to provide a unified security posture across different environments like on-premises, cloud, and hybrid networks [6, 7, 9, 10, 11].

What is the weakness in CVE-2022-41328 called?

The weakness in CVE-2022-41328 is classified as a path traversal vulnerability, also known as an improper limitation of a pathname to a restricted directory (CWE-22). This type of vulnerability allows attackers to access files and directories outside of their intended location by manipulating pathnames, potentially leading to unauthorized file reads or writes [1, 2, 3, 13].

What must an attacker do to exploit CVE-2022-41328?

To exploit this vulnerability, an attacker must first gain privileged access to the Fortinet FortiOS command-line interface (CLI). Once authenticated, they can then send crafted CLI commands that include path traversal sequences to read or write files on the underlying Linux system [1, 12, 15].

Is this vulnerability a risk to internal systems only?

Yes, this vulnerability is considered an internal risk because it requires an attacker to have privileged access to the system's command-line interface. This type of access is typically restricted to authorized administrators and is not directly exposed to the public internet [1, 15].

What is the first step to address CVE-2022-41328?

The immediate first step for organizations running affected versions of Fortinet FortiOS is to update the system to a patched version. Recommended upgrade paths include FortiOS 7.2.4 or later, 7.0.10 or later, or 6.4.12 or later, depending on the current version in use [1, 12, 13].

References

Written by Nicholas Merritt

External-surface CVE analysis and Halo Surface Signal prioritization for Halo Threat Intelligence.