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AUSCERT Security Bulletin
ASB-2020.0076
Oracle CPU April 2020 for Java SE
15 April 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Oracle Java SE
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Modify Arbitrary Files -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-2830 CVE-2020-2816 CVE-2020-2805
CVE-2020-2803 CVE-2020-2800 CVE-2020-2781
CVE-2020-2778 CVE-2020-2773 CVE-2020-2767
CVE-2020-2764 CVE-2020-2757 CVE-2020-2756
CVE-2020-2755 CVE-2020-2754 CVE-2019-18197
Member content until: Friday, May 15 2020
Reference: ASB-2020.0034
ESB-2019.3929
OVERVIEW
Multiple vulnerabilities have been identified in :
o Java Advanced Management Console, version 2.16
o Oracle Java SE, versions 7u251, 8u241, 11.0.6, 14
o Oracle Java SE Embedded, version 8u241
[1]
IMPACT
The vendor has provided the following information regarding the
vulnerabilities:
"This Critical Patch Update contains 15 new security patches for
Oracle Java SE. All of these vulnerabilities may be remotely
exploitable without authentication, i.e., may be exploited over a
network without requiring user credentials." [1]
CVE-2020-2803
8.3 AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H ( legend ) [ Advisory
Supported versions that are affected are Java SE: 7u251, 8u241,
11.0.6 and 14; Java SE Embedded: 8u241. Difficult to exploit
vulnerability allows unauthenticated attacker with network access via
multiple protocols to compromise Java SE, Java SE Embedded.
Successful attacks require human interaction from a person other than
the attacker and while the vulnerability is in Java SE, Java SE
Embedded, attacks may significantly impact additional products.
Successful attacks of this vulnerability can result in takeover of
Java SE, Java SE Embedded.
Note : This vulnerability applies to Java deployments, typically in
clients running sandboxed Java Web Start applications or sandboxed
Java applets, that load and run untrusted code (e.g., code that comes
from the internet) and rely on the Java sandbox for security. This
vulnerability does not apply to Java deployments, typically in
servers, that load and run only trusted code (e.g., code installed by
an administrator).
Affects:
o Java SE, Java SE Embedded Java SE: 7u251, 8u241, 11.0.6, 14;
Java SE Embedded: 8u241
CVE-2020-2805
8.3 AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H ( legend ) [ Advisory
Supported versions that are affected are Java SE: 7u251, 8u241,
11.0.6 and 14; Java SE Embedded: 8u241. Difficult to exploit
vulnerability allows unauthenticated attacker with network access via
multiple protocols to compromise Java SE, Java SE Embedded.
Successful attacks require human interaction from a person other than
the attacker and while the vulnerability is in Java SE, Java SE
Embedded, attacks may significantly impact additional products.
Successful attacks of this vulnerability can result in takeover of
Java SE, Java SE Embedded.
Note : This vulnerability applies to Java deployments, typically in
clients running sandboxed Java Web Start applications or sandboxed
Java applets, that load and run untrusted code (e.g., code that comes
from the internet) and rely on the Java sandbox for security. This
vulnerability does not apply to Java deployments, typically in
servers, that load and run only trusted code (e.g., code installed by
an administrator).
Affects:
o Java SE, Java SE Embedded Java SE: 7u251, 8u241, 11.0.6, 14;
Java SE Embedded: 8u241
CVE-2019-18197
8.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H ( legend ) [ Advisory
The supported version that is affected is Java SE: 8u241. Difficult
to exploit vulnerability allows unauthenticated attacker with network
access via multiple protocols to compromise Java SE. Successful
attacks of this vulnerability can result in takeover of Java SE.
Note : This vulnerability applies to Java deployments, typically in
clients running sandboxed Java Web Start applications or sandboxed
Java applets, that load and run untrusted code (e.g., code that comes
from the internet) and rely on the Java sandbox for security. This
vulnerability does not apply to Java deployments, typically in
servers, that load and run only trusted code (e.g., code installed by
an administrator).
Affects:
o Java SE Java SE: 8u241
CVE-2020-2816
7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N ( legend ) [ Advisory
Supported versions that are affected are Java SE: 11.0.6 and 14.
Easily exploitable vulnerability allows unauthenticated attacker with
network access via HTTPS to compromise Java SE. Successful attacks of
this vulnerability can result in unauthorized creation, deletion or
modification access to critical data or all Java SE accessible data.
Note : This vulnerability can only be exploited by supplying data to
APIs in the specified Component without using Untrusted Java Web
Start applications or Untrusted Java applets, such as through a web
service.
Affects:
o Java SE Java SE: 11.0.6, 14
CVE-2020-2781
5.3 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L ( legend ) [ Advisory
Supported versions that are affected are Java SE: 7u251, 8u241,
11.0.6 and 14; Java SE Embedded: 8u241. Easily exploitable
vulnerability allows unauthenticated attacker with network access via
HTTPS to compromise Java SE, Java SE Embedded. Successful attacks of
this vulnerability can result in unauthorized ability to cause a
partial denial of service (partial DOS) of Java SE, Java SE Embedded.
Note : Applies to client and server deployment of Java. This
vulnerability can be exploited through sandboxed Java Web Start
applications and sandboxed Java applets. It can also be exploited by
supplying data to APIs in the specified Component without using
sandboxed Java Web Start applications or sandboxed Java applets, such
as through a web service.
Affects:
o Java SE, Java SE Embedded Java SE: 7u251, 8u241, 11.0.6, 14;
Java SE Embedded: 8u241
CVE-2020-2830
5.3 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L ( legend ) [ Advisory
Supported versions that are affected are Java SE: 7u251, 8u241,
11.0.6 and 14; Java SE Embedded: 8u241. Easily exploitable
vulnerability allows unauthenticated attacker with network access via
multiple protocols to compromise Java SE, Java SE Embedded.
Successful attacks of this vulnerability can result in unauthorized
ability to cause a partial denial of service (partial DOS) of Java
SE, Java SE Embedded.
Note : Applies to client and server deployment of Java. This
vulnerability can be exploited through sandboxed Java Web Start
applications and sandboxed Java applets. It can also be exploited by
supplying data to APIs in the specified Component without using
sandboxed Java Web Start applications or sandboxed Java applets, such
as through a web service.
Affects:
o Java SE, Java SE Embedded Java SE: 7u251, 8u241, 11.0.6, 14;
Java SE Embedded: 8u241
CVE-2020-2767
4.8 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N ( legend ) [ Advisory
Supported versions that are affected are Java SE: 11.0.6 and 14.
Difficult to exploit vulnerability allows unauthenticated attacker
with network access via HTTPS to compromise Java SE. Successful
attacks of this vulnerability can result in unauthorized update,
insert or delete access to some of Java SE accessible data as well as
unauthorized read access to a subset of Java SE accessible data.
Note : Applies to client and server deployment of Java. This
vulnerability can be exploited through sandboxed Java Web Start
applications and sandboxed Java applets. It can also be exploited by
supplying data to APIs in the specified Component without using
sandboxed Java Web Start applications or sandboxed Java applets, such
as through a web service.
Affects:
o Java SE Java SE: 11.0.6, 14
CVE-2020-2800
4.8 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N ( legend ) [ Advisory
Supported versions that are affected are Java SE: 7u251, 8u241,
11.0.6 and 14; Java SE Embedded: 8u241. Difficult to exploit
vulnerability allows unauthenticated attacker with network access via
multiple protocols to compromise Java SE, Java SE Embedded.
Successful attacks of this vulnerability can result in unauthorized
update, insert or delete access to some of Java SE, Java SE Embedded
accessible data as well as unauthorized read access to a subset of
Java SE, Java SE Embedded accessible data.
Note : This vulnerability can only be exploited by supplying data to
APIs in the specified Component without using Untrusted Java Web
Start applications or Untrusted Java applets, such as through a web
service.
Affects:
o Java SE, Java SE Embedded Java SE: 7u251, 8u241, 11.0.6, 14;
Java SE Embedded: 8u241
CVE-2020-2778
3.7 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N ( legend ) [ Advisory
Supported versions that are affected are Java SE: 11.0.6 and 14.
Difficult to exploit vulnerability allows unauthenticated attacker
with network access via HTTPS to compromise Java SE. Successful
attacks of this vulnerability can result in unauthorized read access
to a subset of Java SE accessible data.
Note : Applies to client and server deployment of Java. This
vulnerability can be exploited through sandboxed Java Web Start
applications and sandboxed Java applets. It can also be exploited by
supplying data to APIs in the specified Component without using
sandboxed Java Web Start applications or sandboxed Java applets, such
as through a web service.
Affects:
o Java SE Java SE: 11.0.6, 14
CVE-2020-2764
3.7 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N ( legend ) [ Advisory
The supported version that is affected is Java Advanced Management
Console: 2.16. Difficult to exploit vulnerability allows
unauthenticated attacker with network access via multiple protocols
to compromise Java SE. Successful attacks of this vulnerability can
result in unauthorized read access to a subset of Java SE accessible
data. Note : This
vulnerability can only be exploited by supplying data to APIs in the
specified Component without using Untrusted Java Web Start
applications or Untrusted Java applets, such as through a web
service.
Affects:
o Java SE Java Advanced Management Console: 2.16
CVE-2020-2754
3.7 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L ( legend ) [ Advisory
Supported versions that are affected are Java SE: 8u241, 11.0.6 and
14; Java SE Embedded: 8u241. Difficult to exploit vulnerability
allows unauthenticated attacker with network access via multiple
protocols to compromise Java SE, Java SE Embedded. Successful attacks
of this vulnerability can result in unauthorized ability to cause a
partial denial of service (partial DOS) of Java SE, Java SE Embedded.
Note : Applies to client and server deployment of Java. This
vulnerability can be exploited through sandboxed Java Web Start
applications and sandboxed Java applets. It can also be exploited by
supplying data to APIs in the specified Component without using
sandboxed Java Web Start applications or sandboxed Java applets, such
as through a web service.
Affects:
o Java SE, Java SE Embedded Java SE: 8u241, 11.0.6, 14; Java SE
Embedded: 8u241
CVE-2020-2755
3.7 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L ( legend ) [ Advisory
Supported versions that are affected are Java SE: 8u241, 11.0.6 and
14; Java SE Embedded: 8u241. Difficult to exploit vulnerability
allows unauthenticated attacker with network access via multiple
protocols to compromise Java SE, Java SE Embedded. Successful attacks
of this vulnerability can result in unauthorized ability to cause a
partial denial of service (partial DOS) of Java SE, Java SE Embedded.
Note : Applies to client and server deployment of Java. This
vulnerability can be exploited through sandboxed Java Web Start
applications and sandboxed Java applets. It can also be exploited by
supplying data to APIs in the specified Component without using
sandboxed Java Web Start applications or sandboxed Java applets, such
as through a web service.
Affects:
o Java SE, Java SE Embedded Java SE: 8u241, 11.0.6, 14; Java SE
Embedded: 8u241
CVE-2020-2773
3.7 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L ( legend ) [ Advisory
Supported versions that are affected are Java SE: 7u251, 8u241,
11.0.6 and 14; Java SE Embedded: 8u241. Difficult to exploit
vulnerability allows unauthenticated attacker with network access via
multiple protocols to compromise Java SE, Java SE Embedded.
Successful attacks of this vulnerability can result in unauthorized
ability to cause a partial denial of service (partial DOS) of Java
SE, Java SE Embedded.
Note : Applies to client and server deployment of Java. This
vulnerability can be exploited through sandboxed Java Web Start
applications and sandboxed Java applets. It can also be exploited by
supplying data to APIs in the specified Component without using
sandboxed Java Web Start applications or sandboxed Java applets, such
as through a web service.
Affects:
o Java SE, Java SE Embedded Java SE: 7u251, 8u241, 11.0.6, 14;
Java SE Embedded: 8u241
CVE-2020-2756
3.7 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L ( legend ) [ Advisory
Supported versions that are affected are Java SE: 7u251, 8u241,
11.0.6 and 14; Java SE Embedded: 8u241. Difficult to exploit
vulnerability allows unauthenticated attacker with network access via
multiple protocols to compromise Java SE, Java SE Embedded.
Successful attacks of this vulnerability can result in unauthorized
ability to cause a partial denial of service (partial DOS) of Java
SE, Java SE Embedded.
Note : Applies to client and server deployment of Java. This
vulnerability can be exploited through sandboxed Java Web Start
applications and sandboxed Java applets. It can also be exploited by
supplying data to APIs in the specified Component without using
sandboxed Java Web Start applications or sandboxed Java applets, such
as through a web service.
Affects:
o Java SE, Java SE Embedded Java SE: 7u251, 8u241, 11.0.6, 14;
Java SE Embedded: 8u241
CVE-2020-2757
3.7 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L ( legend ) [ Advisory
Supported versions that are affected are Java SE: 7u251, 8u241,
11.0.6 and 14; Java SE Embedded: 8u241. Difficult to exploit
vulnerability allows unauthenticated attacker with network access via
multiple protocols to compromise Java SE, Java SE Embedded.
Successful attacks of this vulnerability can result in unauthorized
ability to cause a partial denial of service (partial DOS) of Java
SE, Java SE Embedded.
Note : Applies to client and server deployment of Java. This
vulnerability can be exploited through sandboxed Java Web Start
applications and sandboxed Java applets. It can also be exploited by
supplying data to APIs in the specified Component without using
sandboxed Java Web Start applications or sandboxed Java applets, such
as through a web service.
Affects:
o Java SE, Java SE Embedded Java SE: 7u251, 8u241, 11.0.6, 14;
Java SE Embedded: 8u241
[1]
MITIGATION
Oracle states:
"Due to the threat posed by a successful attack, Oracle strongly
recommends that customers apply CPU fixes as soon as possible. Until
you apply the CPU fixes, it may be possible to reduce the risk of
successful attack by blocking network protocols required by an
attack. For attacks that require certain privileges or access to
certain packages, removing the privileges or the ability to access
the packages from users that do not need the privileges may help
reduce the risk of successful attack. Both approaches may break
application functionality, so Oracle strongly recommends that
customers test changes on non-production systems. Neither approach
should be considered a long-term solution as neither corrects the
underlying problem." [1]
REFERENCES
[1] Oracle Critical Patch Update Advisory - April 2020
https://www.oracle.com/security-alerts/cpuapr2020.html
[2] Text Form of Oracle Critical Patch Update - April 2020 Risk
Matrices
https://www.oracle.com/security-alerts/cpuapr2020verbose.html
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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