CVE-2020-26258 : Security Advisory and Response

XStream is a Java library used for serializing objects to XML and back. This CVE highlights a Server-Side Forgery Request vulnerability in XStream versions prior to 1.4.15.

Understanding CVE-2020-26258

This vulnerability allows a remote attacker to manipulate input streams, potentially accessing internal resources.

What is CVE-2020-26258?

The vulnerability arises during unmarshalling in XStream versions below 1.4.15, enabling a Server-Side Forgery Request.

The Impact of CVE-2020-26258

CVSS Base Score: 7.7 (High Severity)
Attack Vector: Network
Confidentiality Impact: High
Integrity Impact: None
Privileges Required: Low
Scope: Changed
User Interaction: None
Attack Complexity: Low
Availability Impact: None

Technical Details of CVE-2020-26258

This section delves into the specifics of the vulnerability.

Vulnerability Description

The flaw allows remote attackers to request data from internal resources by manipulating input streams.

Affected Systems and Versions

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

Exploitation Mechanism

Attackers can exploit this vulnerability remotely through network access.

Mitigation and Prevention

Protect your systems from CVE-2020-26258 with the following measures:

Immediate Steps to Take

Upgrade XStream to version 1.4.15 or higher to mitigate the vulnerability.
Configure XStream's Security Framework with a whitelist to prevent SSRF attacks.

Long-Term Security Practices

Regularly update XStream and other software components to stay protected against known vulnerabilities.
Implement network security measures to restrict unauthorized access.

Patching and Updates

Stay informed about security advisories and promptly apply patches released by XStream and related vendors.