ClassGraph before 4.8.112 was not resistant to XML eXternal Entity (XXE) attacks. This vulnerability allows attackers to exploit the software by sending specially crafted XML data, which could lead to unauthorized access to sensitive information. With a CVSS score of 7.5, this vulnerability is classified as high severity, indicating a significant risk to organizations relying on this software.
The potential for exploitation is notable, as the attack vector is network-based and requires no user interaction, meaning that attackers can exploit the vulnerability remotely without needing to authenticate. Therefore, organizations must prioritize remediation to prevent possible data breaches and ensure the integrity of their systems.
Organizations should address this vulnerability in their patch management cycle as soon as possible. The urgency is underscored by the high impact on confidentiality, where sensitive data could be compromised. Timely remediation is crucial to maintain security postures against such vulnerabilities.
Currently, there are no known exploits or public proof of concepts for this vulnerability, which means that while the risk is high, active exploitation in the wild has not been confirmed. However, organizations should remain vigilant and take proactive steps to mitigate this risk.
Vulnerability Details
The vulnerability identified as CVE-2021-47621 affects ClassGraph versions prior to 4.8.112. The official description states that the software is susceptible to XML eXternal Entity (XXE) attacks, which can lead to the disclosure of sensitive information. The CVSS score of 7.5 reflects this high-severity vulnerability's potential impact on confidentiality, with a high impact on data exposure.
This vulnerability has been categorized under CWE-611, indicating improper restriction of XML external entity references. The publication date for this vulnerability is June 21, 2024, and it remains under analysis as of the last update.
Technical Analysis
The root cause of CVE-2021-47621 stems from the inability of ClassGraph to properly handle XML external entity references. Attackers may leverage this weakness by sending crafted XML input that triggers the processing of external entities, potentially exposing sensitive data stored on the server or accessible through the application's context.
The attack vector is classified as network-based (AV:N), with a low complexity (AC:L), and no privileges are required (PR:N). As such, user interaction is also not needed (UI:N). The attack's impact is significant in terms of confidentiality (C:H), but it does not affect integrity (I:N) or availability (A:N).
Risk & Impact Analysis
Risk to organizations includes potential exposure of sensitive data, which could lead to significant reputational damage and loss of customer trust. Given that the vulnerability requires no authentication and can be exploited remotely, organizations may face a broad attack surface. The urgency is categorized as high due to the severity of the vulnerability and the potential for exploitation.
Organizations should assess their deployment of ClassGraph and prioritize patching to version 4.8.112 or later. Failure to address this vulnerability could result in severe consequences, including data breaches and compliance violations.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch (version 4.8.112) are affected by this vulnerability. Organizations are encouraged to upgrade to the patched version to mitigate risks associated with this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching ClassGraph to version 4.8.112 or later to remediate this vulnerability. If immediate patching is not possible, consider implementing workarounds such as disabling XML parsing features that may expose the application to XXE attacks. Additionally, organizations should enforce strict input validation and monitor for unusual activity that may indicate exploitation attempts.
For comprehensive security, organizations may consider engaging in penetration testing to continuously assess the application for vulnerabilities and ensure compliance with security best practices.
Detection Guidance
Organizations should monitor logs for indicators of XXE exploitation attempts, such as unusual XML parsing errors or unexpected data retrieval actions. Behavioral anomalies that deviate from normal patterns in data handling should also be investigated. Implementing network signatures that detect suspicious XML payloads can further enhance detection capabilities.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-47621 lies in the ongoing threat posed by XXE vulnerabilities, which continue to be relevant in the context of web application security. Security teams must recognize the patterns of these vulnerabilities and incorporate lessons learned into their security frameworks. A strategic takeaway is the importance of implementing secure coding practices and regular security assessments to protect against such vulnerabilities.
Organizations should continuously enhance their security posture by investing in penetration testing methodology and integrating findings into their development lifecycle.
By fostering a culture of security awareness, organizations can effectively mitigate risks associated with vulnerabilities like CVE-2021-47621. This includes training developers on secure coding practices and utilizing tools that aid in vulnerability detection.
For further resources on security practices, organizations may find valuable insights in the following guides: vulnerability management programs and API penetration testing that can aid in strengthening application security.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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