CVE-2021-20066 is a medium severity vulnerability affecting JSDom, a popular JavaScript implementation of the DOM and HTML standards. This vulnerability allows the loading of local resources improperly, which can lead to manipulation of local files by a malicious web page when script execution is enabled. The CVSS score for this vulnerability is 5.6, indicating a medium level of severity.
The risk to organizations includes potential unauthorized access to local files, which could compromise sensitive data. As web applications become increasingly complex, vulnerabilities like this can be exploited to gain access to user information or modify local configurations.
The exploitation status of CVE-2021-20066 indicates that there are no known public exploits at this time. However, the nature of the vulnerability suggests that the risk remains, particularly for environments where script execution is enabled without adequate safeguards. Organizations should prioritize addressing this vulnerability in their patch cycle.
Given its medium severity, organizations should schedule remediation as part of their ongoing security management efforts. It's essential to maintain updated systems and test for vulnerabilities regularly to mitigate potential exploitation.
Vulnerability Details
The official description states that JSDom improperly allows the loading of local resources, enabling local files to be manipulated by a malicious web page when script execution is enabled. This vulnerability poses a risk to the confidentiality, integrity, and availability of local resources.
The CVSS score of 5.6 classifies this vulnerability as medium severity. The attack vector is network-based, with a high attack complexity and no privileges required for exploitation. User interaction is not necessary, making it easier for attackers to exploit this vulnerability.
JSDom versions prior to the vendor patch are affected, and organizations should verify their current version against the reported vulnerabilities.
Technical Analysis
The root cause of this vulnerability lies in JSDom's handling of local resource loading, which allows script execution to manipulate local files. Attackers may leverage this by crafting a malicious web page that, when visited, executes scripts to access or modify local files.
The attack vector is through the network, requiring the target user to load a malicious web page. The attack complexity is high because it necessitates that the victim enables JavaScript execution within their environment.
No privileges are required to exploit this vulnerability, meaning any user can be targeted. Additionally, no user interaction is necessary apart from visiting the malicious page, which adds to the risk.
The impacts of this vulnerability are categorized as low for confidentiality, integrity, and availability. However, even a low impact can lead to significant issues depending on the context of the organization and the data involved.
Risk & Impact Analysis
Real-world deployment of JSDom in applications can expose organizations to risks if this vulnerability is not mitigated. Attackers may manipulate local files, leading to potential data breaches or application misconfigurations.
The urgency for organizations to address this vulnerability is moderate. With a CVSS score of 5.6 and no known exploits currently available, it should be prioritized in the patch cycle but does not require immediate action.
Organizations should assess the potential blast radius of this vulnerability based on their usage of JSDom and the sensitivity of the data accessed through local files. Proper risk assessment will facilitate effective remediation strategies.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects all versions of JSDom prior to the vendor patch. Organizations should check their JSDom installations against the latest security updates.
Mitigation & Remediation
Organizations should prioritize updating JSDom to the latest patched version to mitigate this vulnerability. Regular security assessments, including penetration testing, should be conducted to identify and remediate vulnerabilities in web applications.
Detection Guidance
Organizations should monitor logs for unusual access patterns to local files and any unauthorized script execution attempts. Behavioral anomalies in web applications could indicate exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-20066 lies in its illustration of the risks associated with local resource loading in web applications. As applications increasingly rely on local resources, vulnerabilities like this can lead to severe security implications if left unaddressed.
Organizations should adopt best practices for input validation and resource loading to prevent similar vulnerabilities from being introduced. Continuous monitoring and security testing will help identify and mitigate risks associated with local resource loading.
In conclusion, CVE-2021-20066 highlights the necessity for robust security practices around local resource handling in web applications. Organizations must prioritize remediation efforts to secure their applications against this and similar vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)