CVE-2021-30047 is a vulnerability affecting VSFTPD version 3.0.3. This vulnerability allows attackers to cause a denial of service due to a limited number of connections allowed. Given its CVSS score of 7.5, this vulnerability is classified as high severity, indicating a significant risk for organizations utilizing this software.
The potential impact includes service interruption and loss of availability, which are critical for any operational environment. Organizations running VSFTPD 3.0.3 are strongly urged to evaluate their exposure to this vulnerability.
Currently, there are no known exploits for this vulnerability in the wild. However, organizations should remain vigilant, as the absence of known exploits does not eliminate the risk.
Organizations should prioritize patching immediately to mitigate the risks associated with this vulnerability and ensure the continued availability of their services.
Vulnerability Details
The official description of CVE-2021-30047 states that VSFTPD 3.0.3 allows attackers to cause a denial of service due to a limited number of connections allowed. This vulnerability falls under the category of denial of service, which can render services unavailable to legitimate users.
The CVSS score for this vulnerability is 7.5, indicating a high severity level. The attack vector is network-based, with low complexity and no required privileges or user interaction. The availability impact is high, while confidentiality and integrity impacts are none.
Technical Analysis
The root cause of CVE-2021-30047 lies in the configuration of VSFTPD 3.0.3, which restricts the number of connections. This limitation can be exploited by attackers to overwhelm the service, leading to denial of service.
The attack vector is network-based, allowing attackers to target vulnerable systems remotely without the need for physical access. The complexity of the attack is low, making it easy for attackers to exploit this vulnerability.
No privileges are required to exploit this vulnerability, and user interaction is not necessary. As a result, this vulnerability presents a significant risk to organizations that use VSFTPD 3.0.3.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2021-30047 is substantial, as the potential for denial of service can disrupt business operations significantly. Organizations relying on VSFTPD for file transfers or other critical functions may face substantial downtime and associated costs.
The blast radius potential is considerable, given that many organizations may employ this software without adequate safeguards. The urgency for addressing this vulnerability is highlighted by its high CVSS score and the potential impact it could have on service availability.
Organizations should address this vulnerability in their priority patch cycle to minimize the risk of exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected version for this vulnerability is VSFTPD 3.0.3. Organizations should consider upgrading to a patched version to mitigate the risks associated with this vulnerability, or if no version details are available, they should state: 'All versions prior to vendor patch'.
Mitigation & Remediation
Organizations should prioritize patching to remediate CVE-2021-30047. The vendor should provide a patch or update to address this vulnerability, and it is crucial for organizations to apply this patch promptly. If a patch is unavailable, organizations should implement workarounds such as limiting the number of connections allowed and monitoring for any unusual activity.
Configuration hardening measures should also be taken into account, including ensuring that only necessary services are running and restricting network access to the server. Organizations should consider implementing network controls to limit access to trusted sources.
Monitoring for signs of abuse or exploitation attempts is essential. Regular audits and security assessments can help identify and mitigate vulnerabilities before they can be exploited.
For more information on securing your systems, organizations should consider engaging in penetration testing to validate their security posture.
Detection Guidance
Organizations should monitor logs for indicators of unauthorized access. Behavioral anomalies such as an unusual number of connection requests may indicate an ongoing attack. Network signatures should be established to detect abnormal patterns associated with this vulnerability.
System changes, such as configuration modifications or unauthorized service starts, should also be monitored closely to detect potential exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-30047 highlights the importance of secure configuration and ongoing maintenance for software systems. This vulnerability represents a critical reminder for organizations about the risks associated with outdated software.
The trend of exposing services without adequate protections continues to pose risks, and organizations should learn from this incident to reinforce their security measures. Regular updates and patches must be part of a comprehensive security strategy.
For further guidance on improving security practices, organizations can refer to the following resources: penetration testing methodology, vulnerability management program, and security testing 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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