Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

ABTV

11/28/2019
09:00 AM
Larry Loeb
Larry Loeb
Larry Loeb
50%
50%

Solr Search Tool Can Allow Remote Code Execution (RCE) by Default

A security vulnerability affecting the Linux enterprise search tool Apache Solr has been reclassified by Tenable as 'high severity status.'

A security vulnerability affecting the Linux enterprise search tool Apache Solr has been reclassified by Tenableas "high severity status." It seems that the default configuration of Solr on Solr 8.1.1 and 8.2.0 for Linux (but not for Windows) allows a remote code execution (RCE).

The NoSQL tool has been maintained since 2006 by open-source organization Apache Software Foundation, news organization CNET having donated it after building on Apache's Lucene. The ASF team has issued an advisory about the situation.

The team describes the vuln as, "If you use the default solr.in.sh file from the affected releases, then JMX monitoring will be enabled and exposed on RMI_PORT (default=18983), without any authentication. If this port is opened for inbound traffic in your firewall, then anyone with network access to your Solr nodes will be able to access JMX, which may in turn allow them to upload malicious code for execution on the Solr server."

The vuln has become recognized as more serious than initially thought when reports of it emerged this past July. It was then thought that it would only allow cybercriminals or other third parties to access monitoring data. However, a full-blown hole was found to exist on port 8983 that would allow RCE to happen.

A revised proof-of-concept has been put up on GitHub showing how such an attack could proceed.

Mitigation for this situation is fairly simple, but may be a bit complicated to implement. The team advises that users should make sure that the effective solr.in.sh file has ENABLE_REMOTE_JMX_OPTS set to "false" on every Solr node and then restart Solr. The effective solr.in.sh file may reside in /etc/defaults/ or another location depending on the install. As a check, validate that the "com.sun.management.jmxremote" family of properties are not listed in the "Java Properties" section of the Solr Admin UI, or configured in a secure way.

Though the team recommends upgrading to version 8.3 because of all the feature modifications they have done, Tenable thinks that 8.3 will still allow the vuln to be active if it is default configured.

Tenable points out that adding authentication to an instance may help. They also note that "unless the Config API is locked down, an attacker could modify the solrconfig.xml file."

— Larry Loeb has written for many of the last century's major "dead tree" computer magazines, having been, among other things, a consulting editor for BYTE magazine and senior editor for the launch of WebWeek.

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Edge-DRsplash-10-edge-articles
I Smell a RAT! New Cybersecurity Threats for the Crypto Industry
David Trepp, Partner, IT Assurance with accounting and advisory firm BPM LLP,  7/9/2021
News
Attacks on Kaseya Servers Led to Ransomware in Less Than 2 Hours
Robert Lemos, Contributing Writer,  7/7/2021
Commentary
It's in the Game (but It Shouldn't Be)
Tal Memran, Cybersecurity Expert, CYE,  7/9/2021
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
Enterprise Cybersecurity Plans in a Post-Pandemic World
Download the Enterprise Cybersecurity Plans in a Post-Pandemic World report to understand how security leaders are maintaining pace with pandemic-related challenges, and where there is room for improvement.
Flash Poll
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2021-21742
PUBLISHED: 2021-09-25
There is an information leak vulnerability in the message service app of a ZTE mobile phone. Due to improper parameter settings, attackers could use this vulnerability to obtain some sensitive information of users by accessing specific pages.
CVE-2020-20508
PUBLISHED: 2021-09-24
Shopkit v2.7 contains a reflective cross-site scripting (XSS) vulnerability in the /account/register component, which allows attackers to hijack user credentials via a crafted payload in the E-Mail text field.
CVE-2020-20514
PUBLISHED: 2021-09-24
A Cross-Site Request Forgery (CSRF) in Maccms v10 via admin.php/admin/admin/del/ids/<id>.html allows authenticated attackers to delete all users.
CVE-2016-6555
PUBLISHED: 2021-09-24
OpenNMS version 18.0.1 and prior are vulnerable to a stored XSS issue due to insufficient filtering of SNMP trap supplied data. By creating a malicious SNMP trap, an attacker can store an XSS payload which will trigger when a user of the web UI views the events list page. This issue was fixed in ver...
CVE-2016-6556
PUBLISHED: 2021-09-24
OpenNMS version 18.0.1 and prior are vulnerable to a stored XSS issue due to insufficient filtering of SNMP agent supplied data. By creating a malicious SNMP 'sysName' or 'sysContact' response, an attacker can store an XSS payload which will trigger when a user of the web UI views the data. This iss...