CVE-2017-15105 : What You Need to Know

An issue was discovered in the validation of wildcard-synthesized NSEC records in unbound prior to version 1.6.8. If a wildcard NSEC record is not properly validated, it could be exploited to demonstrate the non-existence (NXDOMAIN response) of a valid wildcard record or deceive unbound into accepting a NODATA proof.

Understanding CVE-2017-15105

This CVE relates to a vulnerability in the unbound software.

What is CVE-2017-15105?

CVE-2017-15105 is a vulnerability in unbound versions before 1.6.8 that allows for the improper validation of wildcard-synthesized NSEC records.

The Impact of CVE-2017-15105

The vulnerability could be exploited to show the non-existence of a valid wildcard record or trick unbound into accepting a NODATA proof.

Technical Details of CVE-2017-15105

This section provides more technical insights into the CVE.

Vulnerability Description

A flaw in unbound before version 1.6.8 allows improperly validated wildcard NSEC records, leading to potential security risks.

Affected Systems and Versions

Product: unbound
Vendor: NLnet Labs
Versions affected: before 1.6.8

Exploitation Mechanism

The vulnerability could be exploited to demonstrate the non-existence of valid wildcard records or deceive unbound into accepting a NODATA proof.

Mitigation and Prevention

Protecting systems from CVE-2017-15105 is crucial.

Immediate Steps to Take

Update unbound to version 1.6.8 or later to mitigate the vulnerability.
Monitor vendor advisories for patches and updates.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Conduct security assessments and audits to identify vulnerabilities.

Patching and Updates

Apply patches and updates provided by NLnet Labs to address the vulnerability.