External risk intelligence

D-Link DSL-2750B Command Injection Vulnerability

CVE advisoryKnown Exploit

CVE-2016-20017

D-Link DSL-2750B devices are affected by a command injection vulnerability that allows remote, unauthenticated attackers to execute arbitrary commands. This poses a business risk by enabling unauthorized access to and control over affected devices.

5Halo Surface Signal

Command Injection

Dlink Dsl 2750b Firmware

before 1.05

External exposure likelihood

Halo Surface Signal score for CVE-2016-20017

The affected product is an internet-facing consumer networking device (router/modem). The vulnerability exists in the web-based management interface, which is designed to be accessible over the network and is frequently exposed to the public internet in common residential and small office deployments.

Horizon Alert

Summary of the vulnerability and why it matters

D-Link DSL-2750B devices are susceptible to a command injection flaw. This weakness permits unauthorized remote execution of commands. The potential impact includes compromise of device integrity and unauthorized access to data.

  • D-Link DSL-2750B devices
  • Remote command injection flaw
  • Data access and device compromise

Attack Path

How an attacker could exploit the issue

This vulnerability allows for unauthenticated command injection through a web interface on D-Link DSL-2750B devices. An attacker can exploit this by sending specially crafted commands through the `login.cgi` interface. This can lead to unauthorized control and modification of the affected devices. The vulnerability has been exploited in the wild.

  • Unauthenticated access to `login.cgi`
  • Attacker injects commands
  • Attacker gains control

Live Threat

Current exploitation, exposure, and threat context

This vulnerability presents a significant risk due to the ease with which it can be exploited. Attackers can remotely inject commands into D-Link DSL-2750B devices without needing any authentication. This could lead to unauthorized access, data theft, or disruption of services. The extensive use of these devices, particularly in environments where they might be exposed to the internet, amplifies the potential impact.

  • Low skill attacker can exploit.
  • No access or conditions needed.
  • High business risk and urgency.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability could allow unauthorized command execution on affected D-Link devices. Organizations utilizing these devices face potential unauthorized access and modification of system configurations. The issue is associated with the device's web-based management interface.

  • Identify all D-Link DSL-2750B devices.
  • Isolate or disable affected devices.
  • Apply vendor firmware updates and verify.

Frequently asked questions

What is the D-Link DSL-2750B?

The D-Link DSL-2750B is a device that combines modem and router functionalities, commonly used in homes and small offices to provide internet connectivity. It allows users to connect to their internet service provider and share that connection across multiple devices.

What is the weakness in CVE-2016-20017?

CVE-2016-20017 is a command injection vulnerability (CWE-77). This means an attacker can trick the device into executing arbitrary commands by sending specially crafted input through the `login.cgi` interface without needing to log in.

How can an attacker exploit this vulnerability?

An attacker can exploit this by sending unauthenticated requests to the `login.cgi` page on the affected device. These requests would contain malicious commands disguised as normal input, leading the device to execute them.

Who should be concerned about this CVE-2016-20017 threat?

Anyone using D-Link DSL-2750B devices, especially those that are internet-facing, should be concerned. Because these devices are often directly accessible from the internet, they can be targeted by attackers seeking to gain unauthorized control.

What is the first step to respond to this threat?

The initial step is to identify all D-Link DSL-2750B devices within your network. After identification, check for and apply any available firmware updates from D-Link to versions later than 1.05.

References