CVE-2023-28450 is a significant vulnerability in Dnsmasq, a widely used DNS forwarder and DHCP server. The vulnerability arises from a misconfiguration where the default maximum EDNS.0 UDP packet size is set to 4096, rather than the recommended 1232 bytes as dictated by DNS Flag Day 2020. This misconfiguration can lead to potential disruptions in DNS service availability.
With a CVSS score of 7.5, this vulnerability is classified as high severity. The implications of this flaw are critical, as it can affect the availability of DNS services, potentially leading to service outages or denial of service conditions for affected systems.
Currently, there are no known exploits associated with CVE-2023-28450, but its high severity rating necessitates immediate attention. Organizations using affected versions of Dnsmasq should prioritize patching to mitigate this risk and maintain service integrity.
Urgency for defenders is high due to the potential impact on network services. Organizations should assess their environments for usage of Dnsmasq and apply the necessary patches without delay.
Vulnerability Details
The vulnerability allows for potential disruption due to the incorrect default maximum EDNS.0 UDP packet size setting. The affected version is any release of Dnsmasq prior to 2.90. This issue was first published on March 15, 2023.
The CVSS 3.1 vector string for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, indicating it is exploitable over the network with low complexity and does not require user interaction. The impact on availability is high, which aligns with the severity classification.
Technical Analysis
The root cause of CVE-2023-28450 stems from a configuration oversight within Dnsmasq. The attack vector is network-based, allowing remote attackers to exploit the vulnerability without any privileges or user interaction necessary. The low attack complexity means that potential attackers could easily exploit this flaw if found in a vulnerable environment.
This vulnerability primarily affects availability, as it can lead to service disruptions. Organizations relying on Dnsmasq for DNS forwarding or DHCP services must consider this risk in their operational assessments.
Risk & Impact Analysis
Risk to organizations includes potential service outages caused by the misconfiguration of Dnsmasq, which could affect any services relying on DNS resolutions. The blast radius for this vulnerability could be significant, depending on the deployment of Dnsmasq across networks.
Organizations must assess their urgency to patch based on the availability impact and should not underestimate the risk posed by this vulnerability. With a CVSS score of 7.5, this vulnerability should be addressed as part of a high-priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of Dnsmasq prior to 2.90 are affected by this vulnerability. Organizations should ensure they upgrade to the latest version to mitigate the risks associated with this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching by updating to Dnsmasq version 2.90 or later to resolve this vulnerability. If immediate patching is not feasible, consider implementing network controls to mitigate the potential impact until a patch can be applied.
For ongoing risk management, organizations may also benefit from conducting a thorough penetration testing program to assess other potential vulnerabilities.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for abnormal DNS behavior, including unexpected traffic patterns and response times. Any anomalies in DNS service availability should be investigated promptly.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-28450 lies in its representation of configuration-related vulnerabilities that can lead to severe service disruptions. As organizations increasingly rely on automated configurations, ensuring compliance with standards like DNS Flag Day should be a priority.
Security teams should learn to conduct regular reviews of system configurations to prevent vulnerabilities of this nature. Developing a culture of security awareness can help mitigate potential risks.
For detailed guidance on securing configurations and preventing similar vulnerabilities, organizations can refer to our security checklist for web developers. Additionally, implementing a proactive penetration testing methodology can help identify and remediate vulnerabilities before they can be exploited.
Lastly, organizations should stay informed about emerging threats and trends in vulnerability management by following relevant resources and industry best practices.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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