CVE-2017-3792 : Vulnerability Insights and Analysis

A security flaw has been discovered in the kernel of Cisco TelePresence Multipoint Control Unit (MCU) Software, allowing remote unauthenticated attackers to execute arbitrary code or create a denial of service (DoS) situation.

Understanding CVE-2017-3792

What is CVE-2017-3792?

The vulnerability exists in a proprietary device driver in the Cisco TelePresence MCU Software, affecting systems running version 4.3(1.68) or later configured for Passthrough content mode.

The Impact of CVE-2017-3792

The vulnerability could be exploited by sending malicious IPv4 or IPv6 fragments to a specific port, potentially leading to arbitrary code execution or a DoS condition on the targeted system.

Technical Details of CVE-2017-3792

Vulnerability Description

Inadequate validation of packet sizes in reassembling fragmented IPv4 or IPv6 packets
Attackers can overflow a buffer by sending crafted fragments

Affected Systems and Versions

Cisco TelePresence MCU platforms like TelePresence MCU 5300 Series, MSE 8510, and 4500
Systems running software version 4.3(1.68) or later in Passthrough content mode

Exploitation Mechanism

Attackers send malicious IPv4 or IPv6 fragments to a specific port
Exploiting the vulnerability allows for buffer overflow and potential code execution or DoS

Mitigation and Prevention

Immediate Steps to Take

Apply Cisco's released software updates to address the vulnerability

Long-Term Security Practices

Regularly update and patch systems to prevent vulnerabilities
Implement network segmentation and access controls
Monitor network traffic for suspicious activities
Conduct security assessments and audits

Patching and Updates

Cisco has released software updates to fix the vulnerability