External risk intelligence

Apache Solr DataImportHandler Code Injection Vulnerability Advisory

CVE advisoryKnown Exploit

CVE-2019-0193

The Apache Solr DataImportHandler contains a weakness that allows script execution, potentially leading to unauthorized code execution. This impacts organizations by risking data compromise and system compromise. The business risk involves unauthorized access and control over business systems and data.

3Halo Surface Signal

Code Injection

Apache Solr

before 7.7.38.1.0 to before 8.1.28.09.0

External exposure likelihood

Halo Surface Signal score for CVE-2019-0193

Apache Solr is a server-side platform often deployed in enterprise environments. While it frequently handles internal data, it is plausibly reachable from the internet if search or API endpoints are exposed. The vulnerability resides in an optional admin/debugging interface; while not intended for public access, broader application architecture can result in network-reachable configurations.

Horizon Alert

Summary of the vulnerability and why it matters

The Apache Solr DataImportHandler module contains a weakness that can be exploited through its configuration parameter. This flaw allows an attacker to execute arbitrary scripts, potentially leading to unauthorized access and modification of data. The impact on affected organizations could include system compromise and significant business risk.

  • Vulnerable: Solr DataImportHandler
  • Weakness: Allows script execution
  • Impact: Data compromise, system risk

Attack Path

How an attacker could exploit the issue

The DataImportHandler in Apache Solr allows configuration to be provided via a request parameter. This feature, intended for debugging, presents a security risk because the configuration can include executable scripts. An attacker could leverage this to execute arbitrary code on the affected system.

  • Requires an exposed DataImportHandler.
  • Attacker sends crafted request.
  • Results in attacker code execution.

Live Threat

Current exploitation, exposure, and threat context

The Apache Solr DataImportHandler feature presents a security risk due to its ability to process configurations containing scripts from a request parameter. This could allow unauthorized individuals to execute arbitrary code on the affected systems. The vulnerability is particularly concerning given the potential for attackers to gain control over business systems and data. Organizations utilizing this module should consider remediation actions to mitigate this risk.

  • Skilled attackers could exploit this.
  • Requires authenticated access.
  • Significant business risk and urgency.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

The Apache Solr DataImportHandler contains a vulnerability that could allow an attacker to execute scripts. This module, while optional, is popular for data integration and has a feature that can be exploited if a configuration is supplied through a request parameter. The risk is heightened as this configuration can contain scripts, potentially leading to unauthorized code execution. Organizations should prioritize addressing this risk to protect their systems and data.

  • Find exposed Solr assets.
  • Reduce exposure or isolate risk.
  • Apply vendor fix, verify, and monitor.

Frequently asked questions

What is Apache Solr and its DataImportHandler?

Apache Solr is a widely-used open-source search platform. The DataImportHandler (DIH) is an optional module within Solr that facilitates data ingestion from various sources into Solr for indexing.

What type of vulnerability does CVE-2019-0193 describe?

CVE-2019-0193 describes a CWE-94 vulnerability, known as 'Improper Control of Generation of Code'. This weakness affects Apache Solr's DataImportHandler, allowing a request parameter to include a full DIH configuration, potentially leading to code execution when scripts are present.

How is CVE-2019-0193 triggered?

The vulnerability is triggered when a crafted `dataConfig` parameter is sent in a request to the DataImportHandler's debug mode. This parameter can contain scripts that are then executed by Solr.

What is the relevance of CVE-2019-0193 to security?

CVE-2019-0193 allows an attacker to execute arbitrary code on a vulnerable Solr server. This can lead to data compromise, system control, and the installation of malware, posing a significant risk to organizations.

What are the recommended actions for CVE-2019-0193?

To address CVE-2019-0193, it is recommended to upgrade Apache Solr to version 8.2.0 or later. Alternatively, a workaround involves configuring DataImportHandler usages with an 'invariants' section setting the 'dataConfig' parameter to an empty string.

References