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Home Malware

Cisco Legacy Smart Install (Exploit Kit)

February 11, 2025
Reading Time: 3 mins read
in Malware
Cisco Legacy Smart Install (Exploit Kit)

Cisco Legacy Smart Install

Type of Attack

Exploit Kit

Date of initial activity

2024

Motivation

Espionage

Attack Vectors

Credential-based Attacks

Targeted Systems

Linux

Overview

The Cisco Legacy Smart Install exploit represents a significant vulnerability within network infrastructures, particularly affecting Cisco devices. Smart Install, originally designed as an automation feature to streamline the deployment and configuration of Cisco switches, has unfortunately become a target for malicious actors seeking to exploit its inherent weaknesses. This feature allows for remote configuration and installation of devices, making it a useful tool in enterprise environments. However, if left unsecured, it can be leveraged by attackers to gain unauthorized access to critical network systems, posing a serious security risk. Cybersecurity experts have raised concerns over the exploitation of the Legacy Smart Install feature, particularly as it has been found to facilitate network compromise. In recent years, threat actors have been observed abusing this vulnerability to remotely connect to Cisco devices and retrieve sensitive system configuration files. These files often contain valuable information, including credentials, which can be used to escalate privileges and move laterally within the network. By taking advantage of weak security measures or outdated configurations, attackers can compromise entire network infrastructures, exposing organizations to a range of cyber threats, including data breaches, denial-of-service attacks, and ransomware infections.

Targets

Information

How they operate

At a technical level, the exploit begins with the attacker sending a specially crafted packet to a Cisco device that still has the Smart Install feature enabled. When this packet is received, the device’s configuration system trusts the request without proper authentication, as the protocol was designed to be flexible and easy to use in managed network environments. The Smart Install protocol listens for such requests, and once it receives one, it allows remote configuration changes, including uploading of configuration files or even the installation of malicious firmware. Once an attacker successfully connects to a device via the Smart Install exploit, they can gain access to valuable network configuration information. This can include administrative credentials or detailed network settings that provide an attacker with a map of the network’s structure. Using this information, cybercriminals can escalate their access to other devices in the network, either by gaining further administrative rights or by exploiting additional vulnerabilities in the system. In some cases, they can even upload malicious code or install backdoors that persist in the network for future access. The impact of the Cisco Legacy Smart Install exploit is significant because it allows attackers to bypass traditional network security mechanisms, leveraging misconfigured or outdated devices that are still running the Smart Install feature. This opens the door for a variety of malicious activities, including data exfiltration, network disruptions, and system-wide compromises. In addition, once the exploit is successfully executed, it can be challenging for network administrators to detect, as the feature is intended to automate configurations and may not trigger obvious alarms when it is used as designed. To mitigate the risk posed by this exploit, organizations are advised to disable the Smart Install feature on their Cisco devices if it is not needed for their operations. Cisco has provided specific guidance on how to disable Smart Install in its configuration settings, and CISA (Cybersecurity and Infrastructure Security Agency) continues to issue advisories on best practices for securing network devices. Ensuring that the devices are using the latest security patches and configurations will help reduce the likelihood of successful exploitation. Additionally, replacing weak or outdated passwords and enabling stronger authentication methods can further safeguard network devices from such vulnerabilities.  
Reference: 
  • Best Practices for Cisco Device Configuration
Tags: CiscoCisco Legacy Smart InstallCybercriminalsExploit KitLegacy SmartMalware
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