CVE-2019-10203 : Security Advisory and Response

PowerDNS Authoritative daemon (pdns) versions 4.0.x before 4.0.9 and 4.1.x before 4.1.11 are vulnerable to a DoS attack due to a specific serial value issue.

Understanding CVE-2019-10203

This CVE involves a vulnerability in PowerDNS Authoritative daemon (pdns) versions 4.0.x and 4.1.x that can lead to a Denial of Service (DoS) condition.

What is CVE-2019-10203?

The vulnerability in pdns versions 4.0.x before 4.0.9 and 4.1.x before 4.1.11 causes the daemon to crash when encountering a serial value between 2^31 and 2^32-1 while sending a notification to a slave.

The Impact of CVE-2019-10203

The vulnerability can be exploited to trigger a DoS condition, potentially disrupting the availability of the PowerDNS Authoritative daemon.

Technical Details of CVE-2019-10203

Vulnerability Description

The issue in pdns versions 4.0.x and 4.1.x results in a crash of the daemon when specific serial values are encountered during notification to a slave.

Affected Systems and Versions

Product: pdns
Vendor: Red Hat
Affected Versions: pdns versions 4.0.x before 4.0.9, 4.1.x before 4.1.11

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Scope: Unchanged
CVSS Score: 4.3 (Medium)

Mitigation and Prevention

Immediate Steps to Take

Apply the vendor-provided patches for pdns versions 4.0.x and 4.1.x.
Monitor for any unusual crashes or DoS symptoms on the PowerDNS Authoritative daemon.

Long-Term Security Practices

Regularly update and patch all software components to prevent known vulnerabilities.
Implement network security measures to detect and mitigate potential DoS attacks.

Patching and Updates

Red Hat has released patches to address this vulnerability in pdns versions 4.0.x and 4.1.x.