CVE-2024-7784: AXIS OS Secure Boot Bypass Vulnerability

CVE-2024-7784 Overview

A flaw was discovered in the Secure Boot protection mechanism in AXIS OS during internal Axis Security Development Model (ASDM) threat-modelling. This vulnerability enables sophisticated attackers with physical access to bypass device tampering protections, potentially compromising the integrity of Axis network devices. The Secure Boot bypass (CWE-121: Stack-based Buffer Overflow) allows unauthorized modification of device firmware or boot processes, undermining a critical hardware security boundary.

Critical Impact

Physical access attackers can bypass Secure Boot protections in AXIS OS, enabling device tampering and potentially loading unauthorized firmware without detection.

Affected Products

• AXIS OS (specific versions detailed in vendor advisory)
• Axis network cameras and devices running vulnerable AXIS OS versions
• Enterprise and industrial Axis surveillance infrastructure

Discovery Timeline

• 2024-09-10 - CVE-2024-7784 published to NVD
• 2024-11-08 - Last updated in NVD database

Technical Details for CVE-2024-7784

Vulnerability Analysis

This vulnerability affects the Secure Boot implementation in AXIS OS, a critical security mechanism designed to ensure only authorized and cryptographically verified firmware can execute on Axis devices. The underlying weakness is classified as CWE-121 (Stack-based Buffer Overflow), which can be leveraged to corrupt memory during the boot verification process.

The physical attack vector means an adversary requires hands-on access to the target device. Once access is obtained, the attacker can exploit the stack-based buffer overflow to manipulate the boot process, effectively disabling or bypassing the cryptographic verification that Secure Boot is designed to enforce. This enables the loading of tampered firmware or rootkits that persist across device reboots.

The impact is severe for device integrity and confidentiality—attackers can gain complete control over the device, extract sensitive configuration data, inject malicious code, or pivot to attack connected network infrastructure. However, the physical access requirement limits the attack surface to scenarios where adversaries can reach the hardware directly.

Root Cause

The root cause is a stack-based buffer overflow (CWE-121) in the AXIS OS boot process. Insufficient bounds checking during the Secure Boot verification allows specially crafted input to overflow stack buffers, corrupting return addresses or control structures. This memory corruption enables attackers to redirect execution flow and bypass the cryptographic verification steps that would normally prevent unauthorized code execution.

Attack Vector

The attack requires physical access to the Axis device. An attacker with such access can interact with the device's boot process—potentially through hardware debug interfaces, storage manipulation, or direct memory access—to trigger the buffer overflow. By carefully crafting the overflow payload, the attacker can hijack the boot sequence and load unauthorized firmware that would otherwise be rejected by Secure Boot verification.

The physical access requirement (AV:P in the CVSS vector) means this vulnerability cannot be exploited remotely. Typical attack scenarios include:

• Malicious insiders with access to surveillance infrastructure
• Supply chain attacks during device shipping or deployment
• Physical intrusion into facilities housing Axis devices
• Targeted attacks on high-value surveillance assets

Detection Methods for CVE-2024-7784

Indicators of Compromise

• Unexpected firmware versions or checksums that do not match official Axis releases
• Device boot logs showing anomalies or missing Secure Boot verification entries
• Physical signs of device tampering such as broken seals or unauthorized access to enclosures
• Unexplained device behavior, network traffic patterns, or configuration changes following physical access opportunities

Detection Strategies

• Implement firmware integrity monitoring to detect unauthorized modifications to AXIS OS
• Configure centralized logging for all Axis device boot events and security alerts
• Deploy physical intrusion detection systems around critical surveillance infrastructure
• Establish baseline firmware checksums and regularly verify device integrity through Axis management tools

Monitoring Recommendations

• Monitor for unauthorized physical access to areas containing Axis devices using access control logs and surveillance
• Track firmware update events across the Axis device fleet and investigate unexpected changes
• Implement network segmentation and monitor for anomalous traffic from Axis devices that could indicate compromise
• Review Axis device management console for configuration changes or unexpected administrative activity

How to Mitigate CVE-2024-7784

Immediate Actions Required

• Update all affected Axis devices to patched AXIS OS versions as specified in the Axis Security Advisory
• Conduct a physical security audit of all locations housing Axis network devices
• Verify firmware integrity on all Axis devices using official checksums from Axis Communications
• Restrict physical access to Axis devices to authorized personnel only

Patch Information

Axis Communications has released patched AXIS OS versions that address this Secure Boot bypass vulnerability. Organizations should consult the official Axis Security Advisory for CVE-2024-7784 to identify the specific patched versions applicable to their device models. Firmware updates should be applied through official Axis channels and management tools to ensure authenticity.

Workarounds

• Implement strict physical access controls including locked enclosures, tamper-evident seals, and security cameras monitoring device locations
• Deploy Axis devices in physically secured environments with limited personnel access
• Enable and monitor tamper detection features if available on specific device models
• Segment Axis devices on isolated network VLANs to limit lateral movement potential if a device is compromised

# Verify Axis device firmware integrity
# Download official firmware checksum from Axis support portal
# Compare against device-reported firmware version and checksum
# Schedule regular firmware verification audits