CVE-2021-3807 exposes the ansi-regex library to an inefficient regular expression complexity vulnerability. This high-severity flaw can allow attackers to exploit the library in a way that could lead to denial-of-service (DoS) conditions. With a CVSS score of 7.5, this vulnerability is particularly concerning for organizations that rely on this library in their Node.js applications.
The vulnerability was published on September 17, 2021, and has been assigned a high severity rating due to its potential impact on availability. Organizations using vulnerable versions should be aware that the attack vector is network-based, and no user interaction is required to exploit this vulnerability. As the situation evolves, it is critical for organizations to monitor their dependency versions and address this issue promptly.
Risk to organizations includes potential service outages, which could lead to significant operational disruptions. Given the increasing reliance on Node.js applications, organizations are urged to prioritize patching immediately.
Currently, there are no known exploits in the wild for this vulnerability, but as with many high-severity vulnerabilities, it is advisable to address it as part of the organization's security posture.
Vulnerability Details
The vulnerability allows attackers to exploit inefficient regular expressions, which can cause the application to consume excessive CPU resources, potentially leading to downtime. The affected versions of ansi-regex include versions 4.0.0 to 4.1.0, as well as versions 3.0.0, 5.0.0, and 6.0.0. The issue has been classified under CWE-1333, which relates to inefficient regular expression complexity.
The CVSS score of 7.5 highlights the high risk associated with this vulnerability. Organizations using affected versions should take immediate action to mitigate the risks.
Technical Analysis
The root cause of CVE-2021-3807 lies in the handling of regular expressions within the ansi-regex library. Attackers may leverage this vulnerability by sending specially crafted input that exploits the inefficient regex patterns, leading to high CPU usage and potential denial-of-service conditions.
The attack vector is network-based, requiring no privileges or user interaction to exploit, contributing to the severity of this vulnerability. The impact on availability is critical, as the exploitation can lead to complete service outages.
Risk & Impact Analysis
The real-world risk associated with CVE-2021-3807 is significant, particularly for organizations that utilize the ansi-regex library in their applications. The potential for service disruptions increases the urgency to address this vulnerability.
With the CVSS score indicating a high severity, organizations should assess their exposure and prioritize patching as part of their risk management strategies. The blast radius of this vulnerability can extend beyond the immediate affected systems, impacting user experience and operational capabilities.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of ansi-regex are affected by this vulnerability: versions 3.0.0, 4.0.0 to 4.1.0, 5.0.0, and 6.0.0. Additionally, the Oracle communications_cloud_native_core_policy version 1.15.0 is also vulnerable.
Mitigation & Remediation
Organizations should prioritize patching their installations of ansi-regex to the latest versions to mitigate the vulnerabilities. If immediate patching is not feasible, implementing network controls to limit exposure to the library can help reduce the risk. Additionally, continuous monitoring for updates and security advisories is crucial.
For more information on penetration testing services, organizations can refer to penetration testing that can help identify vulnerabilities.
Detection Guidance
To detect potential exploitation attempts related to CVE-2021-3807, organizations should monitor system logs for unusual CPU usage patterns that may indicate denial-of-service attacks. Additionally, behavioral anomalies in application performance should be closely observed.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-3807 lies in its representation of broader issues associated with regular expression handling in applications. Security teams should learn from this incident to enhance their regex usage and validation practices.
Organizations should adopt a proactive approach to security, incorporating regular code audits and security testing methodologies. Effective penetration testing methodology can help identify similar vulnerabilities before they are exploited.
In conclusion, CVE-2021-3807 serves as a reminder of the importance of maintaining robust security practices, particularly in the context of rapidly evolving software dependencies. Organizations are encouraged to remain vigilant and adaptable in their defensive strategies.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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