CVE-2017-6774 : Exploit Details and Defense Strategies

A security flaw in Cisco ASR 5000 Series Aggregated Services Routers running StarOS allows attackers to remotely alter critical system files through FTP.

Understanding CVE-2017-6774

This CVE involves a vulnerability in Cisco ASR 5000 Series Aggregated Services Routers powered by the Cisco StarOS operating system.

What is CVE-2017-6774?

The flaw enables authenticated attackers to overwrite or modify crucial system files remotely by exploiting sensitive system files within specific FTP subdirectories.

The Impact of CVE-2017-6774

Attackers can gain the ability to modify configuration files on compromised systems.
The issue is assigned Cisco Bug IDs: CSCvd47739.

Technical Details of CVE-2017-6774

This section provides detailed technical information about the vulnerability.

Vulnerability Description

Vulnerability Type: File Modification
Attack Vector: Remote
Access Complexity: Low
Authentication: Required

Affected Systems and Versions

Product: StarOS for ASR 5000 Series Aggregated Services Routers
Vendor: Cisco Systems, Inc.
Affected Version: 21.0.v0.65839

Exploitation Mechanism

Attackers exploit the vulnerability by overwriting sensitive configuration files through FTP.

Mitigation and Prevention

Protect your systems from CVE-2017-6774 with these steps:

Immediate Steps to Take

Apply vendor-supplied patches promptly.
Monitor network traffic for any suspicious activity.
Restrict FTP access to essential users only.

Long-Term Security Practices

Regularly update and patch all software and firmware.
Implement network segmentation to limit the impact of potential breaches.
Conduct regular security audits and assessments.

Patching and Updates

Stay informed about security advisories from Cisco Systems, Inc.
Apply recommended patches and updates to mitigate the vulnerability.