CVE-2019-17558:Apache Solr Vulnerable to Remote Code Execution Zero-Day Vulnerability
Apache Solr remained vulnerable to a zero-day weeks after proof-of-concept code became public for CVE-2019-17558.
UPDATE 12/31/2019: The background and solution sections below have been updated to reflect the recent security update released by Apache.
Antecedentes
On October 29, a proof of concept (PoC) for a remote code execution (RCE) vulnerability in Apache Solr, a popular open-source search platform built on Apache Lucene, was published as a GitHub Gist. At the time this blog post was published, this vulnerability did not have a CVE identifier and no confirmation or indication of a solution available from Apache. However, Apache recently announced releases of Solr to address this vulnerability, which is now identified as CVE-2019-17558. Tenable Research confirmed that Apache Solr versions 7.7.2 through 8.3 were vulnerable at the time this blog post was originally published. After the announcement from Apache was released, we can now confirm versions 5.0.0 to 8.3.1 are affected.
Análisis
According to the PoC, an attacker could target a vulnerable Apache Solr instance by first identifying a list of Solr core names. Once the core names have been identified, an attacker can send a specially crafted HTTP POST request to the Config API to toggle the params resource loader value for the Velocity Response Writer in the solrconfig.xml file to true.
Enabling this parameter would allow an attacker to use the velocity template parameter in a specially crafted Solr request, leading to RCE.
Despite the recent release of Apache Solr 8.3 that addresses a default configuration flaw that was reported back in July, this flaw remained a zero-day until December 29.
Prueba de concepto
As mentioned previously, a PoC was published on October 29 as a Github Gist. Days later, an exploit script was published to a GitHub repository.
Solución
On December 3, Apache released Solr version 8.3.1, which reportedly addressed CVE-2019-17558 as referenced in SOLR-13971. However, following the release of 8.3.1, researcher Peter Cseh of Cloudera reported the fix as incomplete to the Apache Solr team, resulting in the hardening of VelocityResponseWriter as part of Solr version 8.4. According to the advisory, “Solr 8.4 removed the params resource loader entirely, and only enables the configset-provided template rendering when the configset is `trusted` (has been uploaded by an authenticated user).”
Identificación de los sistemas afectados
A list of Tenable plugins to identify this vulnerability will appear here as they’re released.
Obtenga más información
- s00py’s GitHub Gist for Apache Solr RCE (Velocity Template)
- jas502n's Exploit Script for Apache Solr RCE (Velocity Template)
- Apache Solr Security Notices
Únase al Equipo de respuesta de seguridad de Tenable en Tenable Community.
Obtenga más información sobre Tenable, la primera plataforma de Cyber Exposure para el control integral de la superficie de ataque moderna.
Obtenga una prueba gratuita por 30 días de Tenable.io Vulnerability Management.
Artículos relacionados
Cybersecurity Snapshot: CISA Says Midnight Blizzard Swiped U.S. Gov’t Emails During Microsoft Hack, Tells Fed Agencies To Take Immediate Action
April 12, 2024Check out CISA’s urgent call for federal agencies to protect themselves from Midnight Blizzard’s breach of Microsoft corporate emails. Plus, a new survey shows cybersecurity pros are guardedly optimistic about AI. Meanwhile, SANS pinpoints the four trends CISOs absolutely must focus on this year. And the NSA is sharing best practices for data security. And much more!
Cybersecurity Snapshot: U.S. Gov’t Unpacks AI Threat to Banks, as NCSC Urges OT Teams to Protect Cloud SCADA Systems
March 29, 2024Check out new guidance for banks on combating AI-boosted fraud. Plus, how to cut cyber risk when migrating SCADA systems to the cloud. Meanwhile, why CISA is fed up with SQLi flaws. And best practices to prevent and respond to DDoS attacks. And much more!
Recent NVD Delays Won’t Affect Tenable Vulnerability Management Customers Thanks To Our Diverse Scoring Sources
March 19, 2024NIST has announced delays in the CVE enrichment process of its National Vulnerability Database (NVD), but the situation doesn’t impact Tenable VM customers because our vulnerability scoring is based on multiple sources.
Navigating Security Challenges Around OT in the DoD’s Manufacturing Lines
April 15, 2024How operational technology can revolutionize logistics, supply chain management, and overall efficiency.
CVE-2024-3400: Zero-Day Vulnerability in Palo Alto Networks PAN-OS GlobalProtect Gateway Exploited in the Wild
April 12, 2024A critical severity command injection vulnerability in Palo Alto Networks PAN-OS has been exploited in limited targeted attacks. While a fix is not yet available, patches are expected to be released on April 14 and mitigation steps are available.
Cybersecurity Snapshot: CISA Says Midnight Blizzard Swiped U.S. Gov’t Emails During Microsoft Hack, Tells Fed Agencies To Take Immediate Action
April 12, 2024Check out CISA’s urgent call for federal agencies to protect themselves from Midnight Blizzard’s breach of Microsoft corporate emails. Plus, a new survey shows cybersecurity pros are guardedly optimistic about AI. Meanwhile, SANS pinpoints the four trends CISOs absolutely must focus on this year. And the NSA is sharing best practices for data security. And much more!
- Vulnerability Management