External risk intelligence

Realtek SDK Vulnerability Allows Unauthorized Command Execution.

CVE advisoryKnown Exploit

CVE-2021-35394

A vulnerability in Realtek's Jungle SDK allows remote attackers to inject commands and compromise systems. This impacts organizations using devices with the affected SDK, risking unauthorized access and data manipulation. Mitigation requires identifying vulnerable assets and applying vendor updates.

5Halo Surface Signal

OS Command Injection

Realtek Rtl819x Jungle Software Development Kit

2.0 to 3.4.14b

External exposure likelihood

Halo Surface Signal score for CVE-2021-35394

The Realtek Jungle SDK is embedded in numerous internet-facing networking devices, such as routers and gateways. The affected component, a diagnostic service (UDPServer), is frequently exposed on these devices by design to facilitate remote network management, making the vulnerable surface public-facing in standard deployments.

Horizon Alert

Summary of the vulnerability and why it matters

The Realtek Jungle SDK includes a diagnostic tool, MP Daemon, which is vulnerable to memory corruption and arbitrary command injection. This flaw can be exploited by remote, unauthenticated attackers. The impact could affect organizational systems and data integrity due to the potential for unauthorized command execution.

  • Vulnerable diagnostic tool
  • Memory corruption and command injection
  • Compromise of systems and data

Attack Path

How an attacker could exploit the issue

An attacker can exploit a vulnerability in Realtek's Jungle SDK to gain unauthorized access and control over affected devices. This vulnerability exists within a diagnostic tool, "MP Daemon," which is often exposed externally and can be triggered by unauthenticated remote attackers. Successful exploitation allows attackers to inject arbitrary commands, leading to significant impact on the device and its data.

  • External network exposure.
  • Unauthenticated attacker access.
  • Triggering arbitrary command injection.

Live Threat

Current exploitation, exposure, and threat context

The Realtek Jungle SDK includes a diagnostic tool that is vulnerable to memory corruption and command injection. These vulnerabilities can be exploited by attackers remotely and without authentication. Exploitation could lead to unauthorized command execution and significant compromise of affected systems, posing a considerable risk to business operations and data.

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

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in Realtek's Jungle SDK allows unauthenticated attackers to execute arbitrary commands remotely. The affected diagnostic tool, 'MP Daemon,' can be exploited over the network, posing a significant risk to systems using this SDK. Organizations should prioritize actions to identify and mitigate this exposure.

  • Find affected Realtek SDK assets.
  • Isolate or reduce exposure of MP Daemon.
  • Apply vendor fixes and validate.
  • Monitor for related activity.

Frequently asked questions

What is the Realtek Jungle SDK and what is it used for?

The Realtek Jungle SDK is a software development kit used for creating products. A component within it, the 'MP Daemon' diagnostic tool, is affected by vulnerabilities. This tool is typically compiled as 'UDPServer'.

What kind of weakness does CVE-2021-35394 describe?

CVE-2021-35394 describes an arbitrary command injection vulnerability, categorized as CWE-78. This allows an attacker to execute unauthorized commands on a system.

What conditions are needed for an attacker to exploit this vulnerability?

An attacker needs network access to exploit this vulnerability. The vulnerability is triggered by remote, unauthenticated attackers, meaning no prior access or credentials are required.

Who needs to care about this Realtek SDK vulnerability?

Organizations should care if they use Realtek's Jungle SDK in devices that are internet-facing. The affected diagnostic tool is often exposed externally by design, creating a potential attack surface.

What is the first step for managing this risk?

The first step is to identify any assets within your organization that are running the affected Realtek SDK. After identification, you should consider isolating or reducing the exposure of the 'MP Daemon' component.

References