A flaw was found in the Open Virtual Network (OVN). Specially crafted UDP packets may bypass egress access control lists (ACLs) in OVN installations configured with a logical switch with DNS records set on it and if the same switch has any egress ACLs configured. This issue can lead to unauthorized access to virtual machines and containers running on the OVN network. The severity of this vulnerability is classified as high with a CVSS score of 8.1.
Risk to organizations includes potential unauthorized access to sensitive data and services, which could have severe operational implications. Organizations should prioritize patching immediately.
As of now, there is no public exploit confirmed for this vulnerability, but organizations should remain vigilant. The vulnerability was published on January 23, 2025, and is currently marked as deferred.
Security teams must assess their OVN configurations and apply necessary mitigations to ensure that egress ACLs are effectively enforced.
Vulnerability Details
The Open Virtual Network (OVN) vulnerability allows attackers to bypass egress ACLs through specially crafted UDP packets. This can lead to unauthorized access to virtual machines and containers. The vulnerability is categorized under CWE-284, which pertains to improper access control.
The CVSS score for this issue is 8.1, indicating a high severity level. The attack vector is network-based, and the attack complexity is classified as high, requiring no privileges or user interaction.
The publication date for this vulnerability is January 23, 2025, and it remains under a deferred status.
Technical Analysis
The root cause of this vulnerability lies in the way OVN handles egress access control lists when DNS records are configured on logical switches. Attackers may exploit this flaw by sending specially crafted UDP packets that bypass the ACLs, allowing them unauthorized access to resources.
The attack vector is network-based, meaning attackers can execute this from a remote location without needing physical access to the OVN environment. The attack complexity is high, suggesting that extensive knowledge of the OVN configuration is required to successfully exploit this vulnerability.
No privileges are required for exploitation, and user interaction is not necessary. The impact on confidentiality, integrity, and availability is classified as high, indicating that successful exploitation could have significant consequences.
Risk & Impact Analysis
The vulnerability poses a serious risk to organizations using OVN, as unauthorized access to virtual machines and containers could lead to data breaches or service disruptions. The potential blast radius is significant, especially for environments where sensitive applications are hosted.
Organizations should assess their exposure and prioritize remediation efforts based on the CVSS score. Given that the vulnerability is categorized as high severity, it is critical to address this issue in the next patch cycle.
The urgency for remediation is high, and organizations should schedule patching activities as soon as possible to mitigate risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch are affected by this vulnerability. Organizations are advised to check for the latest updates from their OVN provider.
Mitigation & Remediation
Organizations should apply patches provided by their OVN vendor as soon as they become available. In the meantime, consider implementing temporary workarounds such as restricting DNS configurations or monitoring network traffic for unusual patterns.
For continuous security testing, organizations may consider utilizing continuous penetration testing services to identify any potential weaknesses in their configurations.
Detection Guidance
Monitor logs for unusual access patterns, specifically related to UDP traffic that bypasses ACLs. Behavioral anomalies in network traffic may indicate attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
This vulnerability underscores the importance of robust access control measures in network configurations. Security teams should note trends in network vulnerabilities and prioritize security assessments to mitigate similar risks in the future.
Organizations can benefit from reviewing their incident response strategies, enhancing their ability to react to potential exploits. For more information on security best practices, refer to the penetration testing methodology and other resources available on our site.
In summary, CVE-2025-0650 presents a significant risk to organizations using OVN. Timely updates and continuous monitoring will be crucial in mitigating the impact of this vulnerability.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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