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CVE-2021-1256 Explained : Impact and Mitigation

Discover the details of CVE-2021-1256 affecting Cisco Firepower Threat Defense Software. Learn about the impact, technical details, affected systems, and mitigation steps.

A vulnerability in the CLI of Cisco Firepower Threat Defense (FTD) Software allows an authenticated attacker to overwrite files on the affected device's file system. This could lead to system instability if critical files are modified.

Understanding CVE-2021-1256

This CVE refers to a specific vulnerability in Cisco Firepower Threat Defense Software that enables attackers to manipulate files through the CLI interface.

What is CVE-2021-1256?

The vulnerability in Cisco Firepower Threat Defense (FTD) Software permits a local attacker to overwrite files on the device's file system via directory traversal techniques by exploiting insufficient user input validation.

The Impact of CVE-2021-1256

Successful exploitation of this vulnerability could result in system instability and the overwrite of critical system files if misused. An attacker with valid credentials can execute arbitrary file overwriting using a specific CLI command.

Technical Details of CVE-2021-1256

This section provides more insights into the vulnerability affecting Cisco Firepower Threat Defense Software.

Vulnerability Description

The weakness stems from the lack of proper input validation for file paths in a specific CLI command, allowing a local attacker to overwrite files on the affected device's file system.

Affected Systems and Versions

The vulnerability impacts Cisco Firepower Threat Defense (FTD) Software. The affected version details are not applicable (n/a).

Exploitation Mechanism

An authenticated and local attacker can exploit this vulnerability by crafting specific user input in a CLI command after logging into the target device. This manipulation enables the attacker to modify files on the device's file system.

Mitigation and Prevention

Protecting systems from CVE-2021-1256 involves immediate actions and long-term security practices.

Immediate Steps to Take

Users are advised to review and apply the security patches and updates provided by Cisco to mitigate the risk posed by this vulnerability.

Long-Term Security Practices

Implementing network segmentation, least privilege access controls, and regular security training for users can help enhance overall cybersecurity posture.

Patching and Updates

Regularly monitor Cisco's security advisories and apply relevant patches and updates to ensure systems are protected from known vulnerabilities.

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