CVE-2021-3499 is a vulnerability found in OVN Kubernetes, specifically in versions up to and including 0.3.0. This vulnerability allows the Egress Firewall to fail in applying firewall rules reliably when multiple DNS rules are present. As a result, there is a potential risk to the confidentiality, integrity, and availability of services that rely on these firewall configurations.
The vulnerability has a CVSS score of 5.6, categorizing it as medium severity. This rating indicates a notable risk that organizations must address. Failure to remediate this vulnerability could lead to significant impacts, including unauthorized access to sensitive data and disruption of service.
Currently, there are no known exploits available for this vulnerability, and it is not listed in the Known Exploited Vulnerabilities (KEV) catalog. However, organizations should still prioritize patching this vulnerability to mitigate any potential risks.
Organizations should prioritize patching immediately to protect their infrastructure from potential exploitation of this vulnerability.
Vulnerability Details
The vulnerability is characterized by the inability of the Egress Firewall in OVN Kubernetes to apply firewall rules properly when faced with multiple DNS rules. This flaw could lead to the unintended exposure of services and data, impacting their confidentiality, integrity, and availability.
The CVSS score of 5.6 indicates a medium severity level, suggesting that while the vulnerability poses a risk, the complexity of exploitation is high, requiring advanced skills or conditions. The affected product is OVN Kubernetes, with a specific focus on versions prior to 0.3.0. This issue was published on June 2, 2021.
Technical Analysis
The root cause of this vulnerability relates to the Egress Firewall's handling of multiple DNS rules, which it does not manage effectively. This oversight can allow unauthorized access to or manipulation of services relying on these rules.
The attack vector is classified as NETWORK, with a high attack complexity. The vulnerability requires no privileges and does not necessitate user interaction, making it easier for an attacker to exploit if they can reach the affected system.
In terms of impact, the vulnerability poses low risks to confidentiality, integrity, and availability. However, the cumulative effect of these low impacts could lead to significant issues if exploited in conjunction with other vulnerabilities.
Risk & Impact Analysis
The risk to organizations includes potential unauthorized access to sensitive data and the compromise of service integrity. Given the nature of the Egress Firewall's functionality, the inability to enforce firewall rules effectively can expose organizations to various attack vectors, resulting in data loss or service disruptions.
Organizations should assess their deployment of OVN Kubernetes and evaluate the impact of this vulnerability on their systems. The urgency of remediation is classified as medium, reflecting the need for organizations to schedule a patching strategy without delay.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of OVN Kubernetes prior to version 0.3.0 are affected by this vulnerability. Organizations should ensure they upgrade to the latest version to mitigate the risk.
Mitigation & Remediation
To remediate this vulnerability, organizations should upgrade to the latest version of OVN Kubernetes. If immediate patching is not possible, consider implementing network segmentation and monitoring to reduce exposure to potential attacks.
For additional assistance, organizations can engage in penetration testing to identify similar weaknesses.
Detection Guidance
Organizations should monitor logs for unusual Egress Firewall activity and DNS requests that deviate from normal patterns. Additionally, network signatures related to unauthorized access attempts should be promptly investigated.
AppSecure Threat Intelligence Insight
This vulnerability underlines the importance of rigorous testing and validation of firewall rules in cloud-native environments. Security teams should implement best practices for configuration management and regularly review firewall rules to mitigate similar vulnerabilities.
For further reading on improving application security, organizations may refer to our vulnerability management program and consider engaging in penetration testing methodology for proactive security measures.
Finally, organizations should stay informed about security trends and updates, which can be found in our analysis of vulnerability exposure severity trends to better prepare for future risks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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