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AUSCERT Security Bulletin
ASB-2023.0076
Oracle Java SE Critical Patch Update
19 April 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: Oracle GraalVM Enterprise Edition
Oracle Java SE
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Resolution: Patch/Upgrade
CVE Names: CVE-2023-21986 CVE-2023-21968 CVE-2023-21967
CVE-2023-21954 CVE-2023-21939 CVE-2023-21938
CVE-2023-21937 CVE-2023-21930
Comment: CVSS (Max): 7.4 CVE-2023-21930 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
CVSS Source: Oracle
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
OVERVIEW
Multiple vulnerabilities have been identified in :
o Oracle GraalVM Enterprise Edition, versions 20.3.8, 20.3.9,
21.3.4, 21.3.5, 22.3.0, 22.3.1
o Oracle Java SE, versions 8u361, 8u361-perf, 11.0.18, 17.0.6, 20
[1]
IMPACT
The vendor has provided the following information regarding the
vulnerabilities:
"This Critical Patch Update contains 8 new security patches, plus
additional third party patches noted below, for Oracle Java SE. 7 of
these vulnerabilities may be remotely exploitable without
authentication, i.e., may be exploited over a network without
requiring user credentials." [1]
"CVE-2023-21930
7.4 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Supported versions that are affected are Oracle Java SE: 8u361,
8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM Enterprise Edition:
20.3.9, 21.3.5 and 22.3.1. Difficult to exploit vulnerability allows
unauthenticated attacker with network access via TLS to compromise
Oracle Java SE, Oracle GraalVM Enterprise Edition. Successful attacks
of this vulnerability can result in unauthorized creation, deletion
or modification access to critical data or all Oracle Java SE, Oracle
GraalVM Enterprise Edition accessible data as well as unauthorized
access to critical data or complete access to all Oracle Java SE,
Oracle GraalVM Enterprise Edition accessible data. 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 can also be exploited by using APIs in the specified
Component, e.g., through a web service which supplies data to the
APIs.
Affects:
o Oracle Java SE, Oracle GraalVM Enterprise Edition Oracle Java
SE: 8u361, 8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM
Enterprise Edition: 20.3.9, 21.3.5, 22.3.1
CVE-2023-21967
5.9 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Supported versions that are affected are Oracle Java SE: 8u361,
8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM Enterprise Edition:
20.3.9, 21.3.5 and 22.3.1. Difficult to exploit vulnerability allows
unauthenticated attacker with network access via HTTPS to compromise
Oracle Java SE, Oracle GraalVM Enterprise Edition. Successful attacks
of this vulnerability can result in unauthorized ability to cause a
hang or frequently repeatable crash (complete DOS) of Oracle Java SE,
Oracle GraalVM Enterprise Edition. 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 can also be
exploited by using APIs in the specified Component, e.g., through a
web service which supplies data to the APIs.
Affects:
o Oracle Java SE, Oracle GraalVM Enterprise Edition Oracle Java
SE: 8u361, 8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM
Enterprise Edition: 20.3.9, 21.3.5, 22.3.1
CVE-2023-21954
5.9 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Supported versions that are affected are Oracle Java SE: 8u361,
8u361-perf, 11.0.18, 17.0.6; Oracle GraalVM Enterprise Edition:
20.3.9, 21.3.5 and 22.3.1. Difficult to exploit vulnerability allows
unauthenticated attacker with network access via multiple protocols
to compromise Oracle Java SE, Oracle GraalVM Enterprise Edition.
Successful attacks of this vulnerability can result in unauthorized
access to critical data or complete access to all Oracle Java SE,
Oracle GraalVM Enterprise Edition accessible data. 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 can also be exploited by using APIs in the specified
Component, e.g., through a web service which supplies data to the
APIs.
Affects:
o Oracle Java SE, Oracle GraalVM Enterprise Edition Oracle Java
SE: 8u361, 8u361-perf, 11.0.18, 17.0.6; Oracle GraalVM
Enterprise Edition: 20.3.9, 21.3.5, 22.3.1
CVE-2023-21986
5.7 AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
Supported versions that are affected are Oracle GraalVM Enterprise
Edition: 20.3.9, 21.3.5 and 22.3.1. Easily exploitable vulnerability
allows unauthenticated attacker with logon to the infrastructure
where Oracle GraalVM Enterprise Edition executes to compromise Oracle
GraalVM Enterprise Edition. While the vulnerability is in Oracle
GraalVM Enterprise Edition, attacks may significantly impact
additional products (scope change). Successful attacks of this
vulnerability can result in unauthorized update, insert or delete
access to some of Oracle GraalVM Enterprise Edition accessible data
and unauthorized ability to cause a partial denial of service
(partial DOS) of Oracle GraalVM Enterprise Edition.
Affects:
o Oracle GraalVM Enterprise Edition Oracle GraalVM Enterprise
Edition: 20.3.9, 21.3.5, 22.3.1
CVE-2023-21939
5.3 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Supported versions that are affected are Oracle Java SE: 8u361,
8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM Enterprise Edition:
20.3.9, 21.3.5 and 22.3.1. Easily exploitable vulnerability allows
unauthenticated attacker with network access via HTTP to compromise
Oracle Java SE, Oracle GraalVM Enterprise Edition. Successful attacks
of this vulnerability can result in unauthorized update, insert or
delete access to some of Oracle Java SE, Oracle GraalVM Enterprise
Edition accessible data. 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 can also be exploited by
using APIs in the specified Component, e.g., through a web service
which supplies data to the APIs.
Affects:
o Oracle Java SE, Oracle GraalVM Enterprise Edition Oracle Java
SE: 8u361, 8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM
Enterprise Edition: 20.3.9, 21.3.5, 22.3.1
CVE-2023-21938
3.7 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Supported versions that are affected are Oracle Java SE: 8u361,
8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM Enterprise Edition:
20.3.8, 21.3.4 and 22.3.0. Difficult to exploit vulnerability allows
unauthenticated attacker with network access via multiple protocols
to compromise Oracle Java SE, Oracle GraalVM Enterprise Edition.
Successful attacks of this vulnerability can result in unauthorized
update, insert or delete access to some of Oracle Java SE, Oracle
GraalVM Enterprise Edition accessible data. 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 Oracle Java SE, Oracle GraalVM Enterprise Edition Oracle Java
SE: 8u361, 8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM
Enterprise Edition: 20.3.8, 21.3.4, 22.3.0
CVE-2023-21968
3.7 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Supported versions that are affected are Oracle Java SE: 8u361,
8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM Enterprise Edition:
20.3.9, 21.3.5 and 22.3.1. Difficult to exploit vulnerability allows
unauthenticated attacker with network access via multiple protocols
to compromise Oracle Java SE, Oracle GraalVM Enterprise Edition.
Successful attacks of this vulnerability can result in unauthorized
update, insert or delete access to some of Oracle Java SE, Oracle
GraalVM Enterprise Edition accessible data. 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 can also be exploited by using APIs in the specified
Component, e.g., through a web service which supplies data to the
APIs.
Affects:
o Oracle Java SE, Oracle GraalVM Enterprise Edition Oracle Java
SE: 8u361, 8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM
Enterprise Edition: 20.3.9, 21.3.5, 22.3.1
CVE-2023-21937
3.7 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Supported versions that are affected are Oracle Java SE: 8u361,
8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM Enterprise Edition:
20.3.9, 21.3.5 and 22.3.1. Difficult to exploit vulnerability allows
unauthenticated attacker with network access via multiple protocols
to compromise Oracle Java SE, Oracle GraalVM Enterprise Edition.
Successful attacks of this vulnerability can result in unauthorized
update, insert or delete access to some of Oracle Java SE, Oracle
GraalVM Enterprise Edition accessible data. 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 can also be exploited by using APIs in the specified
Component, e.g., through a web service which supplies data to the
APIs.
Affects:
o Oracle Java SE, Oracle GraalVM Enterprise Edition Oracle Java
SE: 8u361, 8u361-perf, 11.0.18, 17.0.6, 20; Oracle GraalVM
Enterprise Edition: 20.3.9, 21.3.5, 22.3.1" [2]
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 2023
https://www.oracle.com/security-alerts/cpuapr2023.html
[2] Text Form of Oracle Critical Patch Update - April 2023 Risk
Matrices
https://www.oracle.com/security-alerts/cpuapr2023verbose.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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