Important: Red Hat JBoss Web Server security and enhancement update


Important: Red Hat JBoss Web Server security and enhancement update


Security Advisory: Important


An update is now available for Red Hat JBoss Web Server.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.


Red Hat JBoss Web Server is a fully integrated and certified set of components for hosting Java web applications. It is comprised of the Apache HTTP Server, the Apache Tomcat Servlet container, Apache Tomcat Connector (mod_jk), JBoss HTTP Connector (mod_cluster), Hibernate, and the Tomcat Native library.

This release of Red Hat JBoss Web Server 3.1.0 serves as a replacement for Red Hat JBoss Web Server 3.0.3, and includes enhancements.

Security Fix(es):

  • It was reported that the Tomcat init script performed unsafe file handling, which could result in local privilege escalation. (CVE-2016-1240)
  • It was discovered that the Tomcat packages installed certain configuration files read by the Tomcat initialization script as writeable to the tomcat group. A member of the group or a malicious web application deployed on Tomcat could use this flaw to escalate their privileges. (CVE-2016-6325)
  • The JmxRemoteLifecycleListener was not updated to take account of Oracle's fix for CVE-2016-3427. JMXRemoteLifecycleListener is only included in EWS 2.x and JWS 3.x source distributions. If you deploy a Tomcat instance built from source, using the EWS 2.x, or JWS 3.x distributions, an attacker could use this flaw to launch a remote code execution attack on your deployed instance. (CVE-2016-8735)
  • A denial of service vulnerability was identified in Commons FileUpload that occurred when the length of the multipart boundary was just below the size of the buffer (4096 bytes) used to read the uploaded file if the boundary was the typical tens of bytes long. (CVE-2016-3092)
  • It was discovered that the code that parsed the HTTP request line permitted invalid characters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack, or obtain sensitive information from requests other then their own. (CVE-2016-6816)
  • A bug was discovered in the error handling of the send file code for the NIO HTTP connector. This led to the current Processor object being added to the Processor cache multiple times allowing information leakage between requests including, and not limited to, session ID and the response body. (CVE-2016-8745)
  • The Realm implementations did not process the supplied password if the supplied user name did not exist. This made a timing attack possible to determine valid user names. Note that the default configuration includes the LockOutRealm which makes exploitation of this vulnerability harder. (CVE-2016-0762)
  • It was discovered that a malicious web application could bypass a configured SecurityManager via a Tomcat utility method that was accessible to web applications. (CVE-2016-5018)
  • It was discovered that when a SecurityManager is configured Tomcat's system property replacement feature for configuration files could be used by a malicious web application to bypass the SecurityManager and read system properties that should not be visible. (CVE-2016-6794)
  • It was discovered that a malicious web application could bypass a configured SecurityManager via manipulation of the configuration parameters for the JSP Servlet. (CVE-2016-6796)
  • It was discovered that it was possible for a web application to access any global JNDI resource whether an explicit ResourceLink had been configured or not. (CVE-2016-6797)

The CVE-2016-6325 issue was discovered by Red Hat Product Security.


  • This enhancement update adds the Red Hat JBoss Web Server 3.1.0. These packages provide a number of enhancements over the previous version of Red Hat JBoss Web Server.

Users of Red Hat JBoss Web Server are advised to upgrade to these updated packages, which add this enhancement.


Before applying the update, back up your existing Red Hat JBoss Web Server installation (including all applications and configuration files).

The References section of this erratum contains a download link (you must log in to download the update).

Affected Products

  • JBoss Enterprise Web Server Text-Only Advisories x86_64


  • BZ - 1349468 - CVE-2016-3092 tomcat: Usage of vulnerable FileUpload package can result in denial of service
  • BZ - 1367447 - CVE-2016-6325 tomcat: tomcat writable config files allow privilege escalation
  • BZ - 1376712 - CVE-2016-1240 tomcat: unsafe chown of catalina.log in tomcat init script allows privilege escalation
  • BZ - 1390493 - CVE-2016-6797 tomcat: unrestricted access to global resources
  • BZ - 1390515 - CVE-2016-6796 tomcat: security manager bypass via JSP Servlet config parameters
  • BZ - 1390520 - CVE-2016-6794 tomcat: system property disclosure
  • BZ - 1390525 - CVE-2016-5018 tomcat: security manager bypass via IntrospectHelper utility function
  • BZ - 1390526 - CVE-2016-0762 tomcat: timing attack in Realm implementation
  • BZ - 1397484 - CVE-2016-6816 tomcat: HTTP Request smuggling vulnerability due to permitting invalid character in HTTP requests
  • BZ - 1397485 - CVE-2016-8735 tomcat: Remote code execution vulnerability in JmxRemoteLifecycleListener
  • BZ - 1403824 - CVE-2016-8745 tomcat: information disclosure due to incorrect Processor sharing