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CVE-2021-44548 : Security Advisory and Response

Learn about CVE-2021-44548, a vulnerability in Apache Solr allowing SMB network calls leading to data exfiltration and potential remote code execution. Find mitigation steps here.

An Improper Input Validation vulnerability in DataImportHandler of Apache Solr allows an attacker to provide a Windows UNC path resulting in an SMB network call being made from the Solr host to another host on the network. This can lead to various types of attacks, including sensitive data exfiltration and potential remote code execution.

Understanding CVE-2021-44548

What is CVE-2021-44548?

The CVE-2021-44548 vulnerability in Apache Solr affects versions prior to 8.11.1 on Windows systems, allowing attackers to exploit an Input Validation issue in the DataImportHandler component.

The Impact of CVE-2021-44548

This vulnerability may result in:

        Exfiltration of sensitive data (e.g., OS user hashes)
        SMB Relay Attacks for user impersonation or Remote Code Execution

Technical Details of CVE-2021-44548

Vulnerability Description

The issue stems from improper validation in DataImportHandler, enabling attackers to initiate SMB network calls, leading to potential attacks.

Affected Systems and Versions

        Affected Product: Apache Solr
        Vendor: Apache Software Foundation
        Versions: All versions prior to 8.11.1 on Windows platforms

Exploitation Mechanism

Attackers provide a Windows UNC path, triggering unintended SMB network calls, which, if successful, can lead to various attacks.

Mitigation and Prevention

Immediate Steps to Take

        Upgrade Apache Solr to version 8.11.1
        Restrict access to Solr's DataImport handler to trusted clients

Long-Term Security Practices

        Regularly update and patch Apache Solr to ensure the latest security fixes
        Implement network segmentation and access controls to limit attack surfaces

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