CVE-2021-43307 : Vulnerability Insights and Analysis
Learn about CVE-2021-43307, a vulnerability in semver-regex npm package allowing ReDoS attacks. Find mitigation steps and impact details here.
An exponential ReDoS (Regular Expression Denial of Service) vulnerability exists in the semver-regex npm package, allowing attackers to trigger the issue by providing arbitrary input to the test() method.
Understanding CVE-2021-43307
This CVE involves a high-risk Regular Expression Denial of Service vulnerability in the semver-regex npm package.
What is CVE-2021-43307?
- Affects the semver-regex npm package
- Allows triggering ReDoS through the test() method
The Impact of CVE-2021-43307
- CVSS v3.1 Base Score: 5.9 (Medium)
- Attack Complexity: High
- Attack Vector: Network
- Availability Impact: High
- CWE-1333: Inefficient Regular Expression Complexity
Technical Details of CVE-2021-43307
This section delves into the technical aspects of the vulnerability.
Vulnerability Description
The vulnerability allows for the triggering of an exponential ReDoS by exploiting the semver-regex npm package.
Affected Systems and Versions
- Vulnerable Versions: < 3.1.4
- Unaffected Version: 4.0.3
Exploitation Mechanism
Attackers can exploit the vulnerability by providing specially crafted input to the test() method.
Mitigation and Prevention
Protect your systems against CVE-2021-43307 with appropriate measures.
Immediate Steps to Take
- Update the semver-regex npm package to version 4.0.3
- Monitor and restrict input to the test() method
Long-Term Security Practices
- Regularly update npm packages to the latest secure versions
- Implement input validation to prevent malicious inputs
Patching and Updates
- Apply patches and updates promptly to mitigate the vulnerability.