CVE-2019-11766 Explained : Impact and Mitigation

A buffer over-read vulnerability was discovered in the D6_OPTION_PD_EXCLUDE feature of the dhcp6.c file in dhcpcd versions prior to 6.11.7 and 7.x versions prior to 7.2.2.

Understanding CVE-2019-11766

This CVE involves a buffer over-read vulnerability in dhcpcd versions before 6.11.7 and 7.x before 7.2.2.

What is CVE-2019-11766?

dhcp6.c in dhcpcd before 6.11.7 and 7.x before 7.2.2 has a buffer over-read in the D6_OPTION_PD_EXCLUDE feature.

The Impact of CVE-2019-11766

The vulnerability could allow an attacker to exploit the buffer over-read issue, potentially leading to information disclosure or denial of service.

Technical Details of CVE-2019-11766

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability exists in the D6_OPTION_PD_EXCLUDE feature of the dhcp6.c file in dhcpcd versions prior to 6.11.7 and 7.x versions prior to 7.2.2, allowing for a buffer over-read.

Affected Systems and Versions

Affected versions: dhcpcd versions before 6.11.7 and 7.x versions before 7.2.2

Exploitation Mechanism

The vulnerability can be exploited by crafting malicious DHCPv6 packets to trigger the buffer over-read in the D6_OPTION_PD_EXCLUDE feature.

Mitigation and Prevention

Protecting systems from CVE-2019-11766 is crucial to maintaining security.

Immediate Steps to Take

Update dhcpcd to version 6.11.7 or 7.2.2, which contain fixes for the buffer over-read vulnerability.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

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

Patching and Updates

Apply patches and updates provided by the dhcpcd project to address the buffer over-read vulnerability.