CVE-2020-25767 : Vulnerability Insights and Analysis

An issue was discovered in HCC Embedded NicheStack IPv4 4.1. The dnc_copy_in routine for parsing DNS domain names does not check whether a domain name compression pointer is pointing within the bounds of the packet, leading to an Out-of-bounds Read and a Denial-of-Service.

Understanding CVE-2020-25767

This CVE involves a vulnerability in HCC Embedded NicheStack IPv4 4.1 that can be exploited for a Denial-of-Service attack.

What is CVE-2020-25767?

The vulnerability arises from the lack of boundary checking in the dnc_copy_in routine for parsing DNS domain names, allowing Out-of-bounds Reads and potential service denial.

The Impact of CVE-2020-25767

The vulnerability can be exploited to trigger a Denial-of-Service condition, potentially disrupting network services and availability.

Technical Details of CVE-2020-25767

This section provides more technical insights into the vulnerability.

Vulnerability Description

The issue stems from the lack of validation in the dnc_copy_in routine, enabling attackers to perform Out-of-bounds Reads.

Affected Systems and Versions

Affected System: HCC Embedded NicheStack IPv4 4.1
Affected Versions: Not specified

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious DNS packets with specially crafted compression pointers to trigger the Out-of-bounds Read.

Mitigation and Prevention

Protecting systems from CVE-2020-25767 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-supplied patches or updates promptly to mitigate the vulnerability.
Implement network-level protections to filter out potentially malicious DNS packets.

Long-Term Security Practices

Regularly update and patch software to address known vulnerabilities.
Conduct security assessments and audits to identify and remediate potential weaknesses.

Patching and Updates

Stay informed about security advisories related to HCC Embedded NicheStack IPv4 4.1.
Monitor for patches or updates released by the vendor to address this vulnerability.