CVE-2017-3824 : Exploit Details and Defense Strategies

An exploit has been discovered in the handling of list headers in Cisco cBR Series Converged Broadband Routers, potentially allowing unauthorized remote access to cause the device to reload, resulting in a denial of service (DoS) situation.

Understanding CVE-2017-3824

This CVE involves a vulnerability in Cisco cBR Series Converged Broadband Routers that could lead to a DoS condition.

What is CVE-2017-3824?

The vulnerability allows an unauthenticated remote attacker to trigger a device reload, causing a DoS situation.
Cisco cBR-8 Converged Broadband Routers running susceptible versions of Cisco IOS XE are affected.

The Impact of CVE-2017-3824

Unauthorized remote access could lead to a device reload, resulting in a DoS scenario.
The vulnerability affects Cisco cBR-8 Converged Broadband Routers using specific versions of Cisco IOS XE.

Technical Details of CVE-2017-3824

This section provides more technical insights into the vulnerability.

Vulnerability Description

Exploit in list headers handling in Cisco cBR Series Converged Broadband Routers.
Allows unauthorized remote access to cause device reload, leading to a DoS.

Affected Systems and Versions

Product: Cisco IOS XE 15.x
Affected Versions: 15.5(3)S, 15.6(1)S

Exploitation Mechanism

Attackers exploit list headers handling to trigger device reload remotely.

Mitigation and Prevention

Steps to address and prevent the CVE-2017-3824 vulnerability.

Immediate Steps to Take

Apply the fixed releases: 15.5(3)S2, 15.6(1)S1, 15.6(2)S, 15.6(2)SP, 16.4(1).
Monitor network for any unusual activity.

Long-Term Security Practices

Regularly update and patch systems to prevent vulnerabilities.
Implement network segmentation and access controls.

Patching and Updates

Ensure all Cisco cBR-8 Converged Broadband Routers are updated with the fixed releases.