CVE-2021-3803 identifies a high-severity vulnerability in the nth-check library, specifically relating to inefficient regular expression complexity. This vulnerability can lead to significant availability issues, especially within applications relying on this library. The CVSS score for this vulnerability is 7.5, categorizing it as high severity, which necessitates immediate attention from affected organizations.
The vulnerability was published on September 17, 2021, and has since been modified as new information has emerged. Organizations utilizing the nth-check library, particularly those in Debian environments, are urged to assess their exposure to this vulnerability and take appropriate action.
Risk to organizations includes potential downtime or degraded service due to the library's inefficient handling of regular expressions. This could impact the performance of applications that depend on this library, leading to disruptions in availability.
Currently, there is no known exploit for this vulnerability in the wild, which is a positive aspect for organizations. However, it remains crucial to prioritize patching, as the absence of known exploits does not eliminate the risk.
Vulnerability Details
The official description of this vulnerability states that nth-check is vulnerable to inefficient regular expression complexity. This issue is classified under the Common Weakness Enumeration (CWE-1333). The CVSS v3.1 score indicates a high potential impact on availability, while confidentiality and integrity impacts are noted as none.
The affected products include the nth-check library itself and Debian Linux version 10.0. The vulnerability affects all versions of the nth-check library prior to 2.0.1.
Technical Analysis
The root cause of CVE-2021-3803 stems from inefficient regular expression patterns that can lead to excessive resource consumption. This vulnerability can be exploited over a network, requiring no privileges or user interaction, characterizing it as having low attack complexity.
The vulnerability's attack vector is network-based, allowing attackers to potentially disrupt service availability without needing to authenticate. The impact on availability is characterized as high, making this vulnerability particularly concerning for organizations.
Risk & Impact Analysis
Organizations utilizing the nth-check library must understand the real-world risks associated with CVE-2021-3803. The potential for service disruption highlights the need for immediate remediation efforts. The blast radius of this vulnerability could extend to any application relying on nth-check, emphasizing its importance in operational contexts.
Given its CVSS score of 7.5 and the absence of known exploits, organizations should address this vulnerability in their priority patch cycle. The urgency to mitigate the risk is further underscored by the potential for significant impacts on availability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The nth-check library is vulnerable in all versions prior to 2.0.1. Additionally, Debian Linux version 10.0 is also affected by this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching immediately. A patch for the nth-check library is available, which resolves the vulnerability by replacing the inefficient regex with a more efficient parser. Upgrading to version 2.0.1 or later will mitigate the risk.
In the event that an immediate upgrade is not feasible, organizations may consider implementing configuration hardening to limit the impact of this vulnerability, such as restricting access to affected applications or employing monitoring to detect unusual behavior.
Detection Guidance
To detect potential exploitation of CVE-2021-3803, organizations should monitor application logs for anomalies that could indicate service disruption. Additionally, network monitoring tools can help identify unusual traffic patterns that may suggest attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-3803 lies in its representation of how inefficient coding practices can lead to vulnerabilities impacting availability. Security teams should learn from this incident to adopt better coding standards, particularly in library development.
Furthermore, security teams should remain vigilant about emerging trends in vulnerabilities like this, as they can inform defensive strategies. Reviewing resources on penetration testing methodology can enhance awareness of the evolving threat landscape.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)