CVE-2021-21351 Explained : Impact and Mitigation

XStream, a Java library for object serialization to XML, is vulnerable to an attack that may allow remote code execution by manipulating input streams. Users should update to version 1.4.16 to mitigate this risk.

Understanding CVE-2021-21351

This CVE pertains to a vulnerability in XStream before version 1.4.16, allowing a remote attacker to execute arbitrary code by manipulating input streams.

What is CVE-2021-21351?

XStream, a Java library for object serialization to XML, has a vulnerability that can be exploited by a remote attacker to execute arbitrary code through manipulated input streams.

The Impact of CVE-2021-21351

The vulnerability poses a medium severity risk with a CVSS base score of 5.4. Attack complexity is high, requiring network access and user interaction, impacting integrity significantly.

Technical Details of CVE-2021-21351

XStream's vulnerability allows attackers to load and execute malicious code from a remote host by manipulating input streams.

Vulnerability Description

The security flaw in XStream before version 1.4.16 enables remote code execution by abusing processed input streams.

Affected Systems and Versions

XStream versions prior to 1.4.16 are impacted by this arbitrary code execution vulnerability.

Exploitation Mechanism

Remote attackers can exploit this vulnerability through manipulated input streams to execute malicious code.

Mitigation and Prevention

To protect systems from CVE-2021-21351, immediate updates and security measures are essential.

Immediate Steps to Take

Users are advised to upgrade XStream to version 1.4.16 to prevent the execution of arbitrary code and enhance overall system security.

Long-Term Security Practices

Implementing whitelist-based security frameworks and regular updates can help mitigate risks associated with code execution vulnerabilities.

Patching and Updates

Regularly check for security updates and patches for XStream to ensure systems are protected against potential exploits.