CVE-2021-21341 Explained : Impact and Mitigation

XStream is a Java library used for serializing objects to XML and vice versa. An issue in XStream before version 1.4.16 could allow a remote attacker to consume 100% CPU resources on the target system, potentially leading to a denial of service. Users are advised to set up XStream's security framework with a whitelist to mitigate this vulnerability.

Understanding CVE-2021-21341

XStream vulnerability leading to denial of service attack.

What is CVE-2021-21341?

XStream Java library vulnerability allows an attacker to exhaust CPU resources by manipulating input stream, causing denial of service.

The Impact of CVE-2021-21341

The vulnerability can be exploited remotely to consume CPU resources and cause a denial of service, affecting system availability.

Technical Details of CVE-2021-21341

Overview of the vulnerability in XStream, affected systems, and exploitation mechanisms.

Vulnerability Description

XStream vulnerability allows remote attackers to consume CPU resources, potentially leading to denial of service.

Affected Systems and Versions

XStream versions prior to 1.4.16 are affected by this vulnerability.

Exploitation Mechanism

The vulnerability can be exploited by manipulating the input stream, causing excessive CPU usage and denying service to legitimate users.

Mitigation and Prevention

Recommended steps to address and prevent the CVE-2021-21341 vulnerability.

Immediate Steps to Take

Users should update XStream to at least version 1.4.16 and configure the security framework with a minimal whitelist to prevent attacks.

Long-Term Security Practices

Regularly update software libraries and follow security best practices to prevent similar vulnerabilities.

Patching and Updates

Stay informed about security advisories and apply patches promptly to protect systems from known vulnerabilities.