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CVE-2021-21234 : Exploit Details and Defense Strategies

Discover the directory traversal vulnerability (CVE-2021-21234) in spring-boot-actuator-logview library. Learn about the affected versions, impact, and mitigation steps to secure your system.

A directory traversal vulnerability has been discovered in spring-boot-actuator-logview, exposing a log file directory via admin HTTP endpoints. This CVE provides detailed information on the affected versions, impact, and mitigation steps.

Understanding CVE-2021-21234

This section delves into the intricacies of the directory traversal vulnerability in spring-boot-actuator-logview and its implications.

What is CVE-2021-21234?

spring-boot-actuator-logview, a library that adds a simple logfile viewer as a spring boot actuator endpoint, contains a directory traversal vulnerability allowing unauthorized access to files outside the logging base directory.

The Impact of CVE-2021-21234

The CVSS score for this CVE is 7.7, categorizing it as HIGH severity with a confidentiality impact. Attackers can exploit this vulnerability via a low complexity network attack, potentially compromising sensitive information.

Technical Details of CVE-2021-21234

This section provides technical details such as vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability arises from insufficient validation of the base folder parameter, enabling attackers to traverse directories and access unauthorized files.

Affected Systems and Versions

Version < 0.2.13 of spring-boot-actuator-logview is affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating the request parameters to access files outside the intended directory structure.

Mitigation and Prevention

Learn about the immediate steps to take and best practices to prevent exploitation and secure your system.

Immediate Steps to Take

Users are advised to update to version 0.2.13 to patch the vulnerability. Limiting access to unnecessary directories and deploying the application behind a reverse proxy can mitigate the risk.

Long-Term Security Practices

Regularly update dependencies and follow security best practices to prevent future vulnerabilities. Conduct security assessments and monitor for any unusual file access.

Patching and Updates

Ensure timely patching of vulnerable dependencies and stay informed about security advisories to protect your system from potential attacks.

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