CVE-2019-25033 : Security Advisory and Response

Unbound versions prior to 1.9.5 have a disputed vulnerability related to an integer overflow in the regional allocator. The vendor contests the classification of this issue as a vulnerability due to the difficulty of exploitation.

Understanding CVE-2019-25033

What is CVE-2019-25033?

Unbound before version 1.9.5 is susceptible to an integer overflow in the regional allocator through the ALIGN_UP macro. The vendor disputes the vulnerability status, claiming that exploitation is not feasible.

The Impact of CVE-2019-25033

The impact of this vulnerability is disputed due to the vendor's assertion that exploitation is not practical, either remotely or locally.

Technical Details of CVE-2019-25033

Vulnerability Description

The vulnerability in Unbound versions prior to 1.9.5 arises from an integer overflow in the regional allocator, specifically related to the ALIGN_UP macro.

Affected Systems and Versions

Product: Unbound
Vendor: Unbound
Versions affected: All versions prior to 1.9.5

Exploitation Mechanism

The vulnerability allows for an integer overflow in the regional allocator via the ALIGN_UP macro.

Mitigation and Prevention

Immediate Steps to Take

Monitor vendor communications for updates on the disputed vulnerability.
Implement additional security measures to mitigate potential risks.

Long-Term Security Practices

Regularly update Unbound to the latest version to address any security concerns.

Patching and Updates

Stay informed about any changes in the vendor's stance on the vulnerability.