External risk intelligence

Linear eMerge Devices: Command Injection Risk

CVE advisoryKnown Exploit

CVE-2019-7256

Linear eMerge E3-Series devices are susceptible to command injection, allowing unauthorized command execution. This presents a business risk of attackers gaining control over affected systems, potentially compromising data or disrupting operations. Organizations should identify exposed devices and apply vendor fixes.

4Halo Surface Signal

OS Command Injection

Nortekcontrol Linear Emerge Essential Firmware

1.00-06 and earlier

External exposure likelihood

Halo Surface Signal score for CVE-2019-7256

This CVE affects the Linear eMerge E3-Series, which are physical access control and security management appliances. These devices are frequently deployed as network-connected gateways or management portals intended to provide administrative access, often resulting in them being reachable via the public internet.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Horizon Alert

Summary of the vulnerability and why it matters

Linear eMerge E3-Series devices are susceptible to command injection vulnerabilities. This flaw allows attackers to execute arbitrary commands on the affected systems. The potential impact could involve unauthorized access and control over critical business operations managed by these devices.

  • Vulnerable: Linear eMerge E3-Series devices
  • Flaw: Command injection capability
  • Impact: Unauthorized access and control

Attack Path

How an attacker could exploit the issue

The Linear eMerge E3-Series devices are vulnerable to command injection, allowing attackers to execute arbitrary commands. This could lead to unauthorized access and control over the affected systems. Organizations with these devices may face risks related to data integrity and system availability.

  • External network access required
  • Attacker sends malicious commands
  • System control is compromised

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in Linear eMerge E3-Series devices could allow for unauthorized command execution. Attackers could potentially leverage this to gain control over affected systems, leading to data compromise or disruption of access control functions. Given the nature of the vulnerability, organizations should consider this a significant risk.

  • Attacker skill level: Low.
  • Required access or conditions: Network access.
  • Business risk or urgency: High.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in Linear eMerge E3-Series devices allows for command injection, potentially enabling unauthorized code execution. Organizations utilizing these devices face a significant business risk due to the potential for data compromise and system control by attackers. Addressing this issue requires a structured approach to mitigate the impact on organizational assets and operations.

  • Identify all exposed Linear eMerge devices.
  • Reduce exposure by isolating affected systems.
  • Apply vendor fixes, validate, and monitor.

Frequently asked questions

What are Linear eMerge E3-Series devices and what is their function in security systems?

Linear eMerge E3-Series devices are physical access control and security management appliances. They often serve as network-connected gateways or management portals, granting administrative access to security systems.

What type of vulnerability does CVE-2019-7256 represent and what is its weakness classification?

CVE-2019-7256 is a command injection weakness, classified as CWE-78. This vulnerability allows an attacker to trick the device into executing unintended commands, potentially leading to unauthorized system control.

How can an attacker exploit CVE-2019-7256 and what is the scope of its impact?

An attacker can exploit CVE-2019-7256 by sending crafted commands over the network. This vulnerability allows for arbitrary command execution, potentially granting the attacker control over the affected device and the systems it manages.

What is the relevance of CVE-2019-7256 to Halo Surface Signal's threat assessment?

Halo Surface Signal assesses CVE-2019-7256 as 'Likely' due to its impact on Linear eMerge E3-Series devices. These devices are often network-accessible gateways for security management, making them a potential target for exploitation.

What steps should be taken to address the command injection vulnerability in Linear eMerge E3-Series devices?

To address this vulnerability, organizations should first identify all exposed Linear eMerge devices. Then, reduce their exposure by isolating affected systems. Finally, apply any available vendor fixes, validate the implementation, and establish ongoing monitoring.

References

Sources and related resources

Primary sources: NVD, CVE.org, CISA KEV.

NVDPublished Modified