CVE-2021-39145 : What You Need to Know
Learn about CVE-2021-39145 affecting XStream, a library for object serialization. Understand the impact, technical details, and mitigation steps for this critical Arbitrary Code Execution vulnerability.
XStream, a simple library for object serialization, is vulnerable to an Arbitrary Code Execution attack due to a security issue in versions below 1.4.18. This CVE-2021-39145 vulnerability could allow a remote attacker to execute malicious code.
Understanding CVE-2021-39145
XStream has a vulnerability that could be exploited by an attacker to execute arbitrary code remotely. This can lead to severe security risks for systems running affected versions.
What is CVE-2021-39145?
XStream is a library used to serialize objects to XML and back. The security flaw in versions below 1.4.18 enables a remote attacker to execute arbitrary code by manipulating the input stream.
The Impact of CVE-2021-39145
This vulnerability has a high severity impact, with a CVSS v3.1 base score of 8.5. The attack can compromise confidentiality, integrity, and availability of systems, making it critical to address.
Technical Details of CVE-2021-39145
XStream's vulnerability to arbitrary code execution has specific technical aspects that users and system administrators should understand.
Vulnerability Description
The flaw in XStream versions earlier than 1.4.18 allows remote attackers to load and execute arbitrary code by manipulating the input stream. Users who do not follow the recommended security setups are at risk.
Affected Systems and Versions
- Product: XStream
- Vendor: X-Stream
- Versions Affected: < 1.4.18
Exploitation Mechanism
The vulnerability permits attackers to execute arbitrary code by manipulating the input stream. Security measures such as setting up XStream's security framework with whitelists are crucial to mitigating this risk.
Mitigation and Prevention
Dealing with CVE-2021-39145 requires immediate actions and long-term security practices to prevent exploitation.
Immediate Steps to Take
- Update XStream to version 1.4.18 or later to mitigate the vulnerability.
- Implement proper input validation and sanitize user inputs to prevent code injection.
Long-Term Security Practices
- Regularly monitor security advisories and updates from XStream and other relevant sources.
- Conduct security assessments and code reviews to identify and address vulnerabilities proactively.
Patching and Updates
- Apply patches promptly from XStream and follow best practices for secure coding to prevent similar vulnerabilities in the future.