CVE-2021-41018 is a high-severity vulnerability that affects Fortinet FortiWeb versions 6.4.1 and below, as well as 6.3.15 and below. This vulnerability allows improper neutralization of special elements used in an OS command, specifically an 'os command injection'. This flaw enables attackers to execute unauthorized code or commands through crafted HTTP requests, posing a significant risk to organizations using affected versions.
With a CVSS score of 8.8, the severity of this vulnerability is classified as high. The attack vector is network-based, and the attack complexity is low, meaning that exploiting this vulnerability does not require advanced skills or conditions. Organizations should recognize that the potential impact on confidentiality, integrity, and availability is high, making this vulnerability a critical concern.
Currently, there is no public exploit confirmed for CVE-2021-41018, and it is not included in the Known Exploited Vulnerabilities (KEV) catalog. However, organizations should not assume safety; the potential for exploitation still exists, especially considering the vulnerability's characteristics.
Organizations should prioritize patching immediately to mitigate risks associated with CVE-2021-41018. Ensuring that systems are updated to the latest versions will significantly reduce the attack surface and enhance overall security posture.
Vulnerability Details
The vulnerability allows attackers to exploit improper neutralization of special elements in an OS command. The affected products include Fortinet FortiWeb, specifically versions 6.4.1 and below, 6.3.15 and below. The vulnerability was published on February 2, 2022, and is categorized under CWE-78, which refers to OS Command Injection.
The CVSS score for CVE-2021-41018 is 8.8, with the following characteristics: attack vector is network, attack complexity is low, privileges required are low, and user interaction is not required. The impacts on confidentiality, integrity, and availability are all rated as high.
Technical Analysis
The root cause of CVE-2021-41018 stems from insufficient input validation in the FortiWeb product. Attackers can inject malicious commands into the system through crafted HTTP requests, taking advantage of the improper neutralization of inputs. The attack vector is network-based, indicating that an attacker can exploit this vulnerability remotely.
The complexity of the attack is low, requiring minimal technical expertise from the attacker. No user interaction is needed, making it easier for attackers to exploit this vulnerability. The potential impacts include unauthorized access to system resources, data leakage, and service disruptions.
Risk & Impact Analysis
The real-world risk associated with CVE-2021-41018 is significant. Organizations that deploy FortiWeb without timely updates are exposed to the risk of attackers executing arbitrary commands, which can lead to data breaches, loss of integrity, and service outages. Given the high CVSS score, the urgency for remediation is critical.
The blast radius of this vulnerability is broad, as it affects multiple versions of FortiWeb. Organizations should assess their deployment of Fortinet products and prioritize updates to versions that mitigate this vulnerability.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Fortinet FortiWeb are affected by CVE-2021-41018: versions 6.4.1 and below, 6.3.15 and below, and versions 6.2.0 to 6.2.6. Organizations should ensure they upgrade to the latest versions to mitigate this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching by upgrading FortiWeb to versions that address CVE-2021-41018. If an immediate patch is unavailable, consider implementing network controls to limit access and monitoring to detect any suspicious activity. Continuous security testing, such as continuous penetration testing, can help identify weaknesses in the interim.
Detection Guidance
To detect potential exploitation of CVE-2021-41018, monitor logs for unusual command execution patterns or HTTP request anomalies. Behavioral anomalies in user activity may also indicate attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
CVEs like CVE-2021-41018 highlight the ongoing challenges organizations face in securing web applications. As attackers continue to evolve their techniques, security teams must adopt a proactive approach to vulnerability management. Regularly updating software, conducting penetration testing, and implementing secure coding practices are critical steps in defending against potential exploits.
Understanding vulnerabilities like CVE-2021-41018 helps organizations fortify their defenses and prepare for future threats. Security teams should leverage this knowledge to enhance their overall security strategies and ensure robust protection against emerging vulnerabilities.
For further insights, organizations can explore resources on application security and vulnerability management by visiting the AppSecure website.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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