CVE-2021-27292 : Vulnerability Insights and Analysis

This article provides detailed information about CVE-2021-27292, which involves a vulnerability in ua-parser-js that can lead to denial of service attacks.

Understanding CVE-2021-27292

CVE-2021-27292 is a security vulnerability in ua-parser-js versions greater than or equal to 0.7.14, which was fixed in version 0.7.24. The issue arises from a vulnerable regular expression that can be exploited by attackers to trigger denial of service attacks.

What is CVE-2021-27292?

CVE-2021-27292 is a vulnerability in ua-parser-js that allows attackers to cause denial of service by sending malicious User-Agent headers, leading to extended processing times.

The Impact of CVE-2021-27292

The impact of this vulnerability is significant as it can result in service disruption and prolonged unresponsiveness due to the processing of malicious input.

Technical Details of CVE-2021-27292

CVE-2021-27292 involves:

Vulnerability Description

ua-parser-js versions 0.7.14 and above contain a regular expression vulnerability that could be exploited by sending a specially crafted User-Agent header to trigger denial of service.

Affected Systems and Versions

Any system or application that uses vulnerable versions of ua-parser-js (>= 0.7.14) until the fix in version 0.7.24 is susceptible to this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending malicious User-Agent headers, causing ua-parser-js to become unresponsive while processing the crafted input.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-27292, consider the following steps:

Immediate Steps to Take

Update ua-parser-js to version 0.7.24 or higher to ensure the vulnerability is patched.
Monitor system logs for any signs of denial of service attacks or unusual processing delays.

Long-Term Security Practices

Regularly update software components and libraries to prevent the exploitation of known vulnerabilities.
Implement input validation mechanisms to filter out potentially malicious requests.

Patching and Updates

Stay informed about security updates and patches released by ua-parser-js and other relevant software vendors to protect against emerging threats.