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BusyBox Vulnerability Allows Remote Code Execution or Denial-of-Service

A vulnerability in BusyBox allows a remote attacker on an adjacent network to execute arbitrary code or cause a denial-of-service condition.

A vulnerability in BusyBox allows an attacker from an adjacent network to execute arbitrary code or cause a denial-of-service (DoS) condition. BusyBox is a software suite that provides several reduced versions of common Unix utilities into a single small executable. It is designed for embedded operating systems, making it a common component in network devices, IoT devices, and other resource-constrained systems. This vulnerability, if successfully exploited, could allow attackers to gain unauthorized access to devices, disrupt services, and potentially pivot to other systems within the network. Defenders need to identify and patch vulnerable BusyBox installations to prevent exploitation.

Attack Chain

  1. The attacker gains access to an adjacent network, either physically or through compromised systems.
  2. The attacker scans the network to identify devices running vulnerable versions of BusyBox.
  3. The attacker sends crafted network packets to the target device exploiting the identified vulnerability.
  4. The vulnerable BusyBox component parses the malicious input without proper sanitization.
  5. The attacker executes arbitrary code on the device, potentially gaining a shell.
  6. Alternatively, the crafted packets cause a denial-of-service condition, crashing the BusyBox process or the entire device.
  7. If code execution is achieved, the attacker may install malware, exfiltrate data, or use the compromised device as a pivot point for further attacks.

Impact

Successful exploitation of this vulnerability can lead to complete system compromise, allowing attackers to execute arbitrary code and potentially gain full control over affected devices. A denial-of-service attack can disrupt critical services provided by the devices, impacting network availability and business operations. The wide deployment of BusyBox in embedded systems means a successful attack could have a significant impact, potentially affecting thousands of devices across various industries.

Recommendation

  • Identify all systems running BusyBox within your network.
  • Apply available patches or updates provided by BusyBox to mitigate the vulnerability.
  • Monitor network traffic for suspicious activity indicative of exploitation attempts.
  • Implement network segmentation to limit the impact of a successful attack from an adjacent network.

Detection coverage 2

Detect Suspicious Network Activity to BusyBox

medium

Detects network connections to BusyBox processes that may indicate exploitation attempts.

sigma tactics: initial_access sources: network_connection, linux

Detect Abnormal Process Execution by BusyBox

high

Detects unusual process execution originating from BusyBox, which may indicate code execution vulnerability exploitation.

sigma tactics: execution techniques: T1059.004 sources: process_creation, linux

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