![]() ![]() If you haven't installed it yet, download it from and run the installer. NET Core SDK, if it's not already installed on your machine. Whichever tool you use, you should end up with the same files and you can compare their contents to the contents that we show in the examples. However you are totally free to use Visual Studio (Windows/Mac) or Visual Studio Code (Windows/Unix/Max) to create the console application project and to add references to the Nuget packages. NET CLI because PowerShell provides a command line environment that is also cross platform. We will be using PowerShell to invoke the. NET CLI (Command Line Interface) because it's a cross platform way to generate the project file we need and to add references to Nuget packages. That means that Lucene.NET can be used in Windows and Unix applications, ASP.NET websites (Windows, Mac or Unix), iOS Apps, Android Apps and even on the Raspberry Pi. It's worth mentioning that Lucene.NET runs everywhere that. These example console applications will give you some working code that can serve as a great starting point for trying out various Lucene.NET features. The first example will show how to do exact match searches and the 2nd example will show how to do a full text search. Actually, let's build two apps that do that. Now let's build a simple console application that can index a few documents, search those documents, and return some results. ![]() If you haven't read the Introduction page yet, do that first so that you have some context for understanding the code we are going to write. Get a free 30-day trial of Tenable.io Vulnerability Management.Sometimes the best way to learn is just to see some working code. Learn more about Tenable, the first Cyber Exposure platform for holistic management of your modern attack surface. Join Tenable's Security Response Team on the Tenable Community. jas502n's Exploit Script for Apache Solr RCE (Velocity Template).s00py’s GitHub Gist for Apache Solr RCE (Velocity Template).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).” Identifying affected systemsĪ list of Tenable plugins to identify this vulnerability will appear here as they’re released. 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. ![]() On December 3, Apache released Solr version 8.3.1, which reportedly addressed CVE-2019-17558 as referenced in SOLR-13971. Days later, an exploit script was published to a GitHub repository. Proof of conceptĪs mentioned previously, a PoC was published on October 29 as a Github Gist. 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.Įnabling this parameter would allow an attacker to use the velocity template parameter in a specially crafted Solr request, leading to RCE.ĭespite 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. AnalysisĪccording to the PoC, an attacker could target a vulnerable Apache Solr instance by first identifying a list of Solr core names. After the announcement from Apache was released, we can now confirm versions 5.0.0 to 8.3.1 are affected. Tenable Research confirmed that Apache Solr versions 7.7.2 through 8.3 were vulnerable at the time this blog post was originally published. 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. 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. UPDATE : The background and solution sections below have been updated to reflect the recent security update released by Apache. Apache Solr remained vulnerable to a zero-day weeks after proof-of-concept code became public for CVE-2019-17558.
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