CVE-2017-15094 : Exploit Details and Defense Strategies

PowerDNS Recursor version 4.0.0 to 4.0.6 is affected by a memory leak vulnerability in the DNSSEC parsing code when processing specific DNSSEC ECDSA keys.

Understanding CVE-2017-15094

This CVE involves a memory leak issue in PowerDNS Recursor versions 4.0.0 to 4.0.6 when handling certain DNSSEC ECDSA keys during validation.

What is CVE-2017-15094?

The vulnerability in PowerDNS Recursor versions 4.0.0 to 4.0.6 leads to a memory leak when parsing specially crafted DNSSEC ECDSA keys, triggered during validation.

The Impact of CVE-2017-15094

The memory leak issue can potentially be exploited by attackers to cause denial of service (DoS) by consuming excessive system resources.

Technical Details of CVE-2017-15094

PowerDNS Recursor version 4.0.0 to 4.0.6 is susceptible to a memory leak vulnerability in the DNSSEC parsing code.

Vulnerability Description

The problem arises when processing specific DNSSEC ECDSA keys during validation, resulting in a memory leak.

Affected Systems and Versions

Product: PowerDNS Recursor
Vendor: PowerDNS
Versions Affected: 4.0.0 up to and including 4.0.6

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specially crafted DNSSEC ECDSA keys during the validation process.

Mitigation and Prevention

To address CVE-2017-15094, follow these steps:

Immediate Steps to Take

Update PowerDNS Recursor to a non-vulnerable version.
Disable DNSSEC validation if not required.

Long-Term Security Practices

Regularly monitor security advisories from PowerDNS.
Implement network segmentation to contain potential attacks.

Patching and Updates

Apply patches provided by PowerDNS to fix the memory leak vulnerability.