CVE-2021-23382 : Vulnerability Insights and Analysis
Discover the details of CVE-2021-23382, a vulnerability in postcss before 8.2.13 allowing Regular Expression Denial of Service attacks. Learn about impact, affected systems, and mitigation steps.
A detailed overview of CVE-2021-23382, a vulnerability found in the package postcss before version 8.2.13 that is susceptible to Regular Expression Denial of Service (ReDoS) attacks.
Understanding CVE-2021-20657
This section provides insights into the nature of the vulnerability and its potential impact on affected systems.
What is CVE-2021-20657?
The vulnerability in the postcss package prior to version 8.2.13 exposes it to Regular Expression Denial of Service (ReDoS) attacks through specific functions in the code.
The Impact of CVE-2021-20657
The vulnerability has a CVSS base score of 5.3, indicating a medium severity level. Attack vector is through the network with low attack complexity and impact on availability.
Technical Details of CVE-2021-20657
Explore the technical aspects of the vulnerability to understand affected systems, exploitation mechanisms, and mitigation strategies.
Vulnerability Description
The vulnerability resides in the getAnnotationURL() and loadAnnotation() functions in lib/previous-map.js, allowing malicious actors to trigger ReDoS attacks through crafted regular expressions.
Affected Systems and Versions
The postcss versions prior to 8.2.13 are affected by this vulnerability. Users with custom-built versions are particularly at risk.
Exploitation Mechanism
The vulnerable regex patterns in the code, specifically related to sourceMappingURL, can be exploited to launch ReDoS attacks, impacting the availability of the system.
Mitigation and Prevention
Learn about immediate actions to secure systems, best security practices for long-term protection, and the importance of prompt patching and updates.
Immediate Steps to Take
Users are advised to update the postcss package to version 8.2.13 or above to mitigate the vulnerability. Monitoring for any suspicious activities is recommended.
Long-Term Security Practices
Incorporate regular security audits, implement secure coding practices, and stay informed about potential threats to enhance long-term security posture.
Patching and Updates
Regularly check for security patches and updates from the official sources to address known vulnerabilities and strengthen the resilience of the system.