CVE-2019-11579 : Exploit Details and Defense Strategies

A buffer overflow vulnerability in the DHCP client implementation of dhcpcd version 7.2.1 and below can lead to a one-byte read overflow related to the DHO_OPTSOVERLOADED option.

Understanding CVE-2019-11579

This CVE involves a specific vulnerability in the dhcpcd software.

What is CVE-2019-11579?

The vulnerability in the dhcp.c file of dhcpcd version 7.2.1 and earlier allows for a buffer overflow during a one-byte read operation associated with the DHO_OPTSOVERLOADED option.

The Impact of CVE-2019-11579

The buffer overflow vulnerability can potentially be exploited by attackers to execute arbitrary code or cause a denial of service (DoS) condition on affected systems.

Technical Details of CVE-2019-11579

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability in dhcp.c of dhcpcd before version 7.2.1 results in a 1-byte read overflow with the DHO_OPTSOVERLOADED option.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: dhcpcd version 7.2.1 and below

Exploitation Mechanism

The vulnerability can be exploited through crafted DHCP packets that trigger the buffer overflow, potentially leading to unauthorized code execution or service disruption.

Mitigation and Prevention

Protecting systems from CVE-2019-11579 requires immediate actions and long-term security measures.

Immediate Steps to Take

Update dhcpcd to version 7.2.1 or later to mitigate the vulnerability.
Monitor network traffic for any signs of malicious DHCP packets.

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

Ensure timely installation of security patches and updates for dhcpcd to prevent exploitation of this vulnerability.