CVE-2021-21976 is a high-severity vulnerability in VMware vSphere Replication, affecting versions prior to 8.3.1.2, 8.2.1.1, 8.1.2.3, and 6.5.1.5. This vulnerability allows post-authentication command injection which may permit an authenticated admin user to execute arbitrary code remotely. The CVSS score of 7.2 indicates a significant risk, primarily due to the combination of high impact on confidentiality, integrity, and availability.
Organizations utilizing affected versions of VMware vSphere Replication should be aware of the potential for exploitation, especially in network environments where the vulnerability could be leveraged. As the exploitability is rated high, it is critical for organizations to prioritize patching to mitigate any risk associated with this vulnerability.
Risk to organizations includes unauthorized remote code execution by authenticated users, which could lead to significant security breaches. Organizations should assess their exposure and implement necessary patches without delay.
Urgency for defenders is high due to the nature of the vulnerability and its potential impact. Organizations should prioritize patching immediately.
Vulnerability Details
The vulnerability is described in the CVE database as a post-authentication command injection vulnerability, specifically categorized under CWE-78. This indicates that the flaw allows for command injection after an admin user has authenticated, thus bypassing initial security measures.
The CVSS score of 7.2 signifies a high severity level, with the attack vector being network-based, low attack complexity, and requiring high privileges. There is no user interaction required for exploitation, making it particularly dangerous.
The affected products include various versions of VMware vSphere Replication. The vulnerability was first published on February 11, 2021.
Technical Analysis
The root cause of CVE-2021-21976 lies in the improper handling of user inputs after authentication, which allows attackers to inject malicious commands that the server executes. The attack vector is the network, meaning that an attacker can exploit this vulnerability remotely.
With low attack complexity, this vulnerability can be exploited even by those with limited technical skills, provided they have authenticated access. The attacker requires high privileges, specifically administrative rights, to leverage this vulnerability effectively.
The confidentiality, integrity, and availability impacts are all rated high, indicating that successful exploitation could lead to significant breaches, including complete system compromise.
Risk & Impact Analysis
The real-world deployment risk includes the possibility of an attacker gaining control over critical systems through the exploitation of this vulnerability. Given that attackers may leverage this flaw to execute arbitrary commands remotely, the implications for organizations can be severe, including data theft, system manipulation, and potential regulatory breaches.
This vulnerability poses a significant blast radius, particularly in environments where multiple systems interact with vSphere Replication. Organizations must recognize the urgency of addressing this vulnerability based on its CVSS score and exploitability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected versions of VMware vSphere Replication include:
All versions prior to 8.3.1.2, 8.2.1.1, 8.1.2.3, and 6.5.1.5.
Mitigation & Remediation
Organizations should apply the latest patches provided by VMware to remediate this vulnerability. Details about the patches can be found in the official advisory.
In addition to patching, organizations are encouraged to conduct a thorough review of their security configurations and apply necessary hardening measures to minimize the risk of exploitation.
Continuous security testing can also help identify potential vulnerabilities in the environment.
Detection Guidance
Monitoring for unusual command execution patterns and logging access attempts can help in detecting potential exploitation attempts of this vulnerability.
Organizations should also review their logs for any signs of unauthorized access or suspicious activities that may indicate an attempt to exploit CVE-2021-21976.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-21976 lies in its demonstration of how even authenticated users can pose a risk if vulnerabilities exist within critical systems. It highlights the need for rigorous security protocols.
This incident reflects a broader trend of increased command injection vulnerabilities within enterprise applications, urging security teams to enhance their defensive strategies.
Penetration testing methodologies should be regularly reviewed and updated to address new vulnerabilities effectively.
Security teams must also focus on continuous training to ensure that all personnel are aware of the latest threats and best practices for preventing exploitation.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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