CVE-2017-3826 Explained : Impact and Mitigation

A vulnerability in the Stream Control Transmission Protocol (SCTP) decoder of the Cisco NetFlow Generation Appliance (NGA) software before version 1.1(1a) could allow an unauthorized remote attacker to trigger a denial of service (DoS) condition by sending malformed SCTP packets.

Understanding CVE-2017-3826

This CVE entry describes a vulnerability in the Cisco NetFlow Generation Appliance software that could lead to a DoS condition.

What is CVE-2017-3826?

The vulnerability in the SCTP decoder of Cisco NGA software versions prior to 1.1(1a) allows remote attackers to disrupt device operation, potentially causing it to hang or reload unexpectedly.

The Impact of CVE-2017-3826

Exploitation of this vulnerability could result in a DoS situation, rendering the affected device unresponsive or triggering a reload, requiring user intervention for recovery.

Technical Details of CVE-2017-3826

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The flaw arises from inadequate validation of SCTP packets on NGA data ports, enabling attackers to disrupt device operation.

Affected Systems and Versions

Cisco NetFlow Generation Appliance software versions prior to 1.1(1a)
Specifically affects NGA 3140, NGA 3240, and NGA 3340

Exploitation Mechanism

Attackers send malformed SCTP packets over a monitored network
Vulnerability not triggered by SCTP packets to NGA's IP address
Successful exploitation can lead to device unresponsiveness or reload

Mitigation and Prevention

Protecting systems from CVE-2017-3826 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-provided patches or updates to mitigate the vulnerability
Monitor network traffic for any signs of exploitation

Long-Term Security Practices

Implement network segmentation to limit the impact of potential attacks
Regularly update and patch software to address known vulnerabilities

Patching and Updates

Cisco has released patches to address this vulnerability
Regularly check for updates and apply them promptly to ensure system security