RHSA-2017:0061 - Security Advisory

Topic

An update for java-1.6.0-openjdk is now available for Red Hat Enterprise Linux
5, Red Hat Enterprise Linux 6, and Red Hat Enterprise Linux 7.

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.

Description

The java-1.6.0-openjdk packages provide the OpenJDK 6 Java Runtime Environment
and the OpenJDK 6 Java Software Development Kit.

Security Fix(es):

• It was discovered that the Hotspot component of OpenJDK did not properly check

arguments of the System.arraycopy() function in certain cases. An untrusted Java
application or applet could use this flaw to corrupt virtual machine's memory
and completely bypass Java sandbox restrictions. (CVE-2016-5582)

• It was discovered that the Hotspot component of OpenJDK did not properly check

received Java Debug Wire Protocol (JDWP) packets. An attacker could possibly use
this flaw to send debugging commands to a Java program running with debugging
enabled if they could make victim's browser send HTTP requests to the JDWP port
of the debugged application. (CVE-2016-5573)

• It was discovered that the Libraries component of OpenJDK did not restrict the

set of algorithms used for Jar integrity verification. This flaw could allow an
attacker to modify content of the Jar file that used weak signing key or hash
algorithm. (CVE-2016-5542)

Note: After this update, MD2 hash algorithm and RSA keys with less than 1024
bits are no longer allowed to be used for Jar integrity verification by default.
MD5 hash algorithm is expected to be disabled by default in the future updates.
A newly introduced security property jdk.jar.disabledAlgorithms can be used to
control the set of disabled algorithms.

• A flaw was found in the way the JMX component of OpenJDK handled classloaders.

An untrusted Java application or applet could use this flaw to bypass certain
Java sandbox restrictions. (CVE-2016-5554)

• A flaw was found in the way the Networking component of OpenJDK handled HTTP

proxy authentication. A Java application could possibly expose HTTPS server
authentication credentials via a plain text network connection to an HTTP proxy
if proxy asked for authentication. (CVE-2016-5597)

Note: After this update, Basic HTTP proxy authentication can no longer be used
when tunneling HTTPS connection through an HTTP proxy. Newly introduced system
properties jdk.http.auth.proxying.disabledSchemes and
jdk.http.auth.tunneling.disabledSchemes can be used to control which
authentication schemes can be requested by an HTTP proxy when proxying HTTP and
HTTPS connections respectively.

Solution

For details on how to apply this update, which includes the changes described in
this advisory, refer to:

https://access.redhat.com/articles/11258

All running instances of OpenJDK Java must be restarted for this update to take
effect.

Affected Products

• Red Hat Enterprise Linux Server 7 x86_64
• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.7 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.6 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.5 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.3 x86_64
• Red Hat Enterprise Linux Server - AUS 7.7 x86_64
• Red Hat Enterprise Linux Server - AUS 7.6 x86_64
• Red Hat Enterprise Linux Server - AUS 7.4 x86_64
• Red Hat Enterprise Linux Server - AUS 7.3 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 7 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.7 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.6 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.5 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.4 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.3 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.7 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.6 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.5 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.4 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.3 ppc64
• Red Hat Enterprise Linux for Scientific Computing 7 x86_64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server - TUS 7.7 x86_64
• Red Hat Enterprise Linux Server - TUS 7.6 x86_64
• Red Hat Enterprise Linux Server - TUS 7.3 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 7 s390x
• Red Hat Enterprise Linux EUS Compute Node 7.7 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.6 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.5 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.4 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.3 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.7 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.6 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.3 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, big endian 7 ppc64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386

Fixes

• BZ - 1385402 - CVE-2016-5582 OpenJDK: incomplete type checks of System.arraycopy arguments (Hotspot, 8160591)
• BZ - 1385544 - CVE-2016-5573 OpenJDK: insufficient checks of JDWP packets (Hotspot, 8159519)
• BZ - 1385714 - CVE-2016-5554 OpenJDK: insufficient classloader consistency checks in ClassLoaderWithRepository (JMX, 8157739)
• BZ - 1385723 - CVE-2016-5542 OpenJDK: missing algorithm restrictions for jar verification (Libraries, 8155973)
• BZ - 1386103 - CVE-2016-5597 OpenJDK: exposure of server authentication credentials to proxy (Networking, 8160838)

CVEs

• CVE-2016-5542
• CVE-2016-5554
• CVE-2016-5597
• CVE-2016-5573
• CVE-2016-5582

References

• https://access.redhat.com/security/updates/classification/#important