Atomicorp WAF Research Note: CVE-2022-24900

Piano LED Visualizer 1.3 - Local File Inclusion

Research Notes

This page documents research related to exploit techniques, attack behaviors, testing results, and WAF rule interactions associated with this vulnerability.

Research finding: this note documents observed WAF protections relevant to exploit techniques associated with this vulnerability.

These notes are not intended to represent the full set of vulnerabilities mitigated by Atomicorp products and should not be interpreted as a coverage matrix, certification list, or census of protected CVEs.

Atomicorp WAF protections are primarily designed around attack techniques and exploit behaviors rather than individual vulnerability identifiers. A published research note documents a positive research finding related to that CVE. If a CVE is absent from these notes, no conclusion should be drawn about protection status.

Vulnerability Description

Piano LED Visualizer is software that allows LED lights to light up as a person plays a piano connected to a computer. Version 1.3 and prior are vulnerable to a path traversal attack. The os.path.join call is unsafe for use with untrusted input. When the os.path.join call encounters an absolute path, it ignores all the parameters it has encountered till that point and starts working with the new absolute path. Since the “malicious” parameter represents an absolute path, the result of os.path.join ignores the static directory completely. Hence, untrusted input is passed via the os.path.join call to flask.send_file can lead to path traversal attacks. A patch with a fix is available on the master branch of the GitHub repository. This can also be fixed by preventing flow of untrusted data to the vulnerable send_file function. In case the application logic necessiates this behaviour, one can either use the flask.safe_join to join untrusted paths or replace flask.send_file calls with flask.send_from_directory calls.

Public Vulnerability References

• NVD
• CVE Record

CVE Details

• CVE: CVE-2022-24900
• Name: Piano LED Visualizer 1.3 - Local File Inclusion
• Severity: high
• CVSS: 8.6 (High)
• CVSS source: N/A
• Vendor: piano_led_visualizer_project
• Product: piano_led_visualizer
• Latest protected observation: 2026-07-03
• Rule IDs observed: 347009

Test or Research Source

• Source: http/cves/2022/CVE-2022-24900.yaml
• Tags: cve, cve2022, iot, lfi, oss, piano, piano_led_visualizer_project, vuln

Research Note Context

This research note documents exploit-technique analysis associated with this vulnerability and references Atomicorp WAF protections observed during engineering review, testing, or validation activities.

Atomicorp security controls are generally designed to identify and mitigate attack techniques and exploit behaviors rather than individual CVE identifiers. As a result, protections developed for one vulnerability may also apply to related attack variants and future vulnerabilities using similar techniques.

Learn More

Atomicorp develops commercially supported security technologies for web applications, servers, endpoints, workloads, and legacy enterprise platforms.

Organizations interested in protecting systems against exploit techniques associated with vulnerabilities such as this one can learn more about:

• Atomic ModSecurity Rules: commercially maintained WAF rules for ModSecurity deployments, including protections for web attacks, bots, scanners, malware, exploitation attempts, and emerging vulnerability classes.
• Atomic WAF: an enterprise web application firewall with Atomicorp rules, centralized management, reporting, authentication controls, and operational tooling.
• Atomic ModSecurity Integrator: a special licensing option for MSPs, MSSPs, OEMs, VARs, reverse proxy providers, and other integrators who want to incorporate Atomicorp ModSecurity rule technology into their own products or services.
• Atomic OSSEC: an enterprise OSSEC-based intrusion detection, compliance, and security monitoring platform.
• Atomic Protector: workload protection for Linux, web, cloud, data center, and hybrid environments.

For additional information, product evaluations, or technical discussions, visit https://www.atomicorp.com/ or https://modsecurity.io/ .