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CVE-2020-26259 : Exploit Details and Defense Strategies

Learn about CVE-2020-26259, a vulnerability in XStream Java library allowing arbitrary file deletion. Find out the impact, affected systems, exploitation mechanism, and mitigation steps.

XStream, a Java library for object serialization to XML, is vulnerable to Arbitrary File Deletion before version 1.4.15.

Understanding CVE-2020-26259

XStream's vulnerability allows remote attackers to delete files on the host by manipulating input streams.

What is CVE-2020-26259?

XStream's vulnerability enables arbitrary file deletion on the local host during unmarshalling, affecting versions prior to 1.4.15.

The Impact of CVE-2020-26259

        CVSS Score: 6.8 (Medium Severity)
        Attack Vector: Network
        Integrity Impact: High
        Scope: Changed
        Attack Complexity: High

Technical Details of CVE-2020-26259

XStream's vulnerability stems from unmarshalling processes, allowing attackers to delete files on the host.

Vulnerability Description

        The flaw permits remote attackers to delete arbitrary files on the host.

Affected Systems and Versions

        Product: XStream
        Vendor: x-stream
        Versions Affected: < 1.4.15

Exploitation Mechanism

        Attackers can exploit the vulnerability by manipulating input streams during unmarshalling.

Mitigation and Prevention

To address CVE-2020-26259, users should take immediate steps and adopt long-term security practices.

Immediate Steps to Take

        Upgrade to XStream version 1.4.15 or higher.
        Implement XStream's Security Framework with a whitelist.

Long-Term Security Practices

        Regularly update XStream to the latest version.
        Follow security advisories and apply patches promptly.

Patching and Updates

        Apply the workaround described in the referenced advisories for users of XStream 1.4.14 or below.

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