CVE-2021-25298 is a significant vulnerability affecting Nagios XI version 5.7.5. This vulnerability allows OS command injection, which can be exploited due to improper sanitization of user-controlled input in a specific PHP file. The impact of this vulnerability is critical, as attackers may leverage it to execute arbitrary commands on the Nagios XI server, potentially leading to severe consequences for affected organizations.
The CVSS score for this vulnerability is 8.8, categorizing it as high severity. This score reflects the ease of exploitation and the potential for significant impact on the confidentiality, integrity, and availability of the system. Organizations should prioritize patching immediately to mitigate any risks associated with this vulnerability.
As of now, there is no public exploit confirmed for this vulnerability, but its presence in the Known Exploited Vulnerabilities (KEV) catalog underscores its importance. Organizations must remain vigilant and ensure that they have applied the necessary updates to their systems to prevent potential exploitation.
In light of recent trends in cyber threats, the urgency for defenders to address this vulnerability cannot be overstated. Organizations that fail to act risk exposing their systems to unauthorized access and potential data breaches.
Vulnerability Details
The vulnerability exists in the file /usr/local/nagiosxi/html/includes/configwizards/cloud-vm/cloud-vm.inc.php. It arises from the improper sanitization of authenticated user-controlled input through a single HTTP request, leading to OS command injection on the Nagios XI server. The vulnerability is classified under CWE-78.
The CVSS version 3.1 vector string for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating that the attack vector is network-based with low complexity and low privileges required for exploitation. The impact on confidentiality, integrity, and availability is categorized as high.
Technical Analysis
The root cause of this vulnerability lies in the lack of proper input sanitization for user-controlled data. Attackers can exploit this vulnerability by sending crafted HTTP requests that allow the execution of arbitrary operating system commands. The attack vector is network-based, meaning that exploitation can occur remotely without physical access to the system.
Given the low attack complexity and minimal privileges required, this vulnerability is particularly concerning. It does not require any user interaction, making it easier for attackers to exploit. The potential impacts on confidentiality, integrity, and availability are severe, as successful exploitation can lead to full control over the affected server.
Risk & Impact Analysis
Risk to organizations includes unauthorized access to sensitive data and the potential for system downtime. The blast radius of this vulnerability extends beyond the Nagios XI server, potentially affecting other interconnected systems and services. Organizations must assess their exposure and implement mitigations promptly.
Given the CVSS score of 8.8 and its inclusion in the KEV catalog, organizations should address this vulnerability in their priority patch cycle. The urgency to remediate is critical, as failure to do so could lead to widespread exploitation and significant operational disruption.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The affected product is Nagios XI, specifically versions from 5.5.6 to 5.7.5. Organizations using these versions should prioritize updating to the latest patched version to mitigate the risk associated with this vulnerability.
Mitigation & Remediation
To remediate this vulnerability, organizations should apply updates per vendor instructions as soon as possible. Those unable to immediately patch should consider implementing network controls to restrict access to affected systems. Additionally, organizations can enhance their security posture by conducting regular security assessments and ensuring proper input validation in all user-facing applications.
Organizations may find value in engaging in penetration testing to identify and remediate similar vulnerabilities.
Detection Guidance
Organizations should monitor logs for unusual command executions and review user activity for any signs of exploitation. Behavioral anomalies should be flagged, and network signatures associated with exploitation attempts should be analyzed. Any changes to system files or configurations should also be scrutinized.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-25298 lies in its demonstration of the risks associated with insufficient input validation in web applications. Security teams should take this as a reminder to enhance their application security practices, focusing on input sanitization and regular code reviews. Additionally, organizations should be aware of the patterns emerging from vulnerabilities like these, as they often lead to large-scale attacks when left unaddressed.
To further strengthen security defenses, organizations are encouraged to implement comprehensive application security assessments and engage in proactive threat modeling to address potential vulnerabilities before they can be exploited.
Overall, the lessons learned from CVE-2021-25298 underscore the importance of ongoing vigilance and adaptation in the face of evolving cyber threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)