SNITCHPUCK.ORG
AN INDEPENDENT RESEARCH BRIEFPRIVACY / HARDWARE / ACCOUNTABILITY

THE SNITCH
IN THE
CEILING.

A school bathroom sensor. Two curious researchers. A privacy promise put to the test.

An illustrated ceiling sensor surrounded by a red signal ring and technical annotations.
FIG. 01 / SENSOR ILLUSTRATION · NOT A HARDWARE DIAGRAM
CASE FILE 001 / HALO SMART SENSORLOOK A LITTLE CLOSER

THE CENTRAL FINDING

A device sold for private spaces could become a listening device when its software was compromised. [2]

01 / THE STORY

It started with
a student’s curiosity.

Rey found an unfamiliar device on his high school’s network. Getting a secondhand unit to examine turned a question about a ceiling sensor into a public security investigation.

In his BSidesPDX retrospective, Rey describes moving from web security into hardware research and the Portland community that helped him along the way. [5]

FROM NETWORK DISCOVERY TO DEF CON

Reynaldo and nyx took the device apart, extracted its firmware, and examined the software behind its reassuring exterior. Their work became Unmasking the Snitch Puck, presented at DEF CON 33 in August 2025. [1] [8]

WIRED reported that attackers on the device’s network could guess weak administrator passwords and install custom firmware. Researchers demonstrated live listening through a secondhand HALO 3C’s microphones. [2]

Read the finding carefully. A demonstrated capability is not proof that deployed devices were secretly recording people. The vendor’s advisory said it knew of no exploitation in customer environments. [3]

02 / INSIDE THE PROMISE

No camera.
Still a privacy question.

HALO is marketed for vape detection, air quality, and safety alerts in places where cameras would be intrusive.

Its advertised audio analytics include selected spoken keywords, critical noises, and gunshot detection. [4] Motorola’s 2024 solution brief describes HALO as not using visual or audio recording. [9] These are vendor claims, not an independent test of detection accuracy.

OUR TAKEAWAY

A promise about what a sensor normally does depends on who can change what it does. Security is part of the privacy promise.

03 / WHAT FAILED

Two weaknesses.
One broken boundary.

01

The login barrier

The vendor acknowledged that brute-force attacks could bypass protections on the device’s web portal.

Vendor advisory
02

The update barrier

The same advisory acknowledged the ability to install unauthorized or malicious firmware.

Vendor advisory
→

The privacy barrier

Controlling the software let the researchers repurpose a sensor as an audio bug.

WIRED reporting

This is a summary of the published research. It does not assess the configuration or firmware of any particular installation today.

04 / THE PUBLIC RECORD

What happened.
What changed.

Follow the product’s expansion, the disclosure, and the response.

2023 → 2025
  1. Beyond school bathrooms

    A vendor case study describes 12 HALO devices installed in Saratoga Springs public-housing apartments earlier that year to enforce a nonsmoking policy. [6]

  2. Motorola acquires IPVideo

    Motorola Solutions announces its acquisition of the company behind HALO. [7]

  3. A critical security advisory

    The vendor publishes affected firmware versions and identifies version 2.17.0.2 as addressing the vulnerabilities. [3]

  4. The findings go public

    Reynaldo and nyx present at DEF CON 33. WIRED publishes its report on the audio-bug demonstration. [8] [2]

  5. The talk reaches a wider audience

    DEF CON publishes the conference recording on its YouTube channel. [1]

05 / THE VENDOR RESPONSE

A fix was issued.
Deployment still matters.

The August 2025 advisory identifies a firmware remedy. It does not establish the update status of every device.

Cloud-connected units were to update automatically, except where customers opted out. Standalone units require manual installation. [3]

AFFECTED VERSIONS IN THE AUG 04, 2025 ADVISORY
DeviceAffected firmware
HALO 3C2.15.0.13 and earlier
HALO 2 / 2C2.14.3.0 and earlier

Named fix: 2.17.0.2. For a current installation, check the vendor’s latest firmware and verify that it is installed. [3]

Read the archived advisory

06 / THE BIGGER QUESTION

Who gets to decide
what a private space senses?

The patch addresses reported vulnerabilities. The research also invites a conversation about consent, oversight, and the limits of safety technology.

ASK ABOUT PURPOSE

What problem is this sensor meant to solve, and what evidence shows it helps?

ASK ABOUT ACCESS

Who can access the device, change its firmware, or see the information it produces?

ASK ABOUT ACCOUNTABILITY

Who checks updates, reviews mistakes, and hears concerns from the people being monitored?

These are editorial questions for a school board, housing authority, or administrator, rather than findings about any specific deployment.

START WITH THE PRIMARY SOURCE

Hear it from
the researchers.

Unmasking the Snitch Puck: IoT surveillance tech in the school bathroom
Reynaldo & nyx · DEF CON 33

Watch the full talk

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