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AUSCERT Security Bulletin
ASB-2021.0144
Oracle Java SE Critical Patch Update
21 July 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Oracle Java SE
Oracle GraalVM Enterprise Edition
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Modify Arbitrary Files -- Remote with User Interaction
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-29921 CVE-2021-2432 CVE-2021-2388
CVE-2021-2369 CVE-2021-2341 CVE-2020-28928
Reference: ESB-2021.1882
ESB-2021.1292
ESB-2021.1291
OVERVIEW
Multiple vulnerabilities have been identified in :
o Oracle GraalVM Enterprise Edition, versions 20.3.2, 21.1.0
o Oracle Java SE, versions 7u301, 8u291, 11.0.11, 16.0.1
[1]
IMPACT
The vendor has provided the following information regarding the
vulnerabilities:
"This Critical Patch Update contains 6 new security patches for
Oracle Java SE. 5 of these vulnerabilities may be remotely
exploitable without authentication, i.e., may be exploited over a
network without requiring user credentials." [1]
CVE-2021-29921
9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Supported versions that are affected are Oracle GraalVM Enterprise
Edition: 20.3.2 and 21.1.0. Easily exploitable vulnerability allows
unauthenticated attacker with network access via multiple protocols
to compromise Oracle GraalVM Enterprise Edition. Successful attacks
of this vulnerability can result in takeover of Oracle GraalVM
Enterprise Edition.
Affects:
o Oracle GraalVM Enterprise Edition Oracle GraalVM Enterprise
Edition: 20.3.2, 21.1.0
CVE-2021-2388
7.5 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Supported versions that are affected are Java SE: 8u291, 11.0.11,
16.0.1; Oracle GraalVM Enterprise Edition: 20.3.2 and 21.1.0.
Difficult to exploit vulnerability allows unauthenticated attacker
with network access via multiple protocols to compromise Java SE,
Oracle GraalVM Enterprise Edition. Successful attacks require human
interaction from a person other than the attacker. Successful attacks
of this vulnerability can result in takeover of 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 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, Oracle GraalVM Enterprise Edition Java SE: 8u291,
11.0.11, 16.0.1; Oracle GraalVM Enterprise Edition: 20.3.2,
21.1.0
CVE-2020-28928
5.5 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Supported versions that are affected are Oracle GraalVM Enterprise
Edition: 20.3.2 and 21.1.0. Easily exploitable vulnerability allows
low privileged attacker with logon to the infrastructure where Oracle
GraalVM Enterprise Edition executes to compromise 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 GraalVM Enterprise Edition.
Affects:
o Oracle GraalVM Enterprise Edition Oracle GraalVM Enterprise
Edition: 20.3.2, 21.1.0
CVE-2021-2369
4.3 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Supported versions that are affected are Java SE: 7u301, 8u291,
11.0.11, 16.0.1; Oracle GraalVM Enterprise Edition: 20.3.2 and
21.1.0. Easily exploitable vulnerability allows unauthenticated
attacker with network access via multiple protocols to compromise
Java SE, Oracle GraalVM Enterprise Edition. Successful attacks
require human interaction from a person other than the attacker.
Successful attacks of this vulnerability can result in unauthorized
update, insert or delete access to some of 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 Java SE, Oracle GraalVM Enterprise Edition Java SE: 7u301,
8u291, 11.0.11, 16.0.1; Oracle GraalVM Enterprise Edition:
20.3.2, 21.1.0
CVE-2021-2432
3.7 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
The supported version that is affected is Java SE: 7u301. 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 ability to
cause a partial denial of service (partial DOS) 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 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 Java SE Java SE: 7u301
CVE-2021-2341
3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Supported versions that are affected are Java SE: 7u301, 8u291,
11.0.11, 16.0.1; Oracle GraalVM Enterprise Edition: 20.3.2 and
21.1.0. Difficult to exploit vulnerability allows unauthenticated
attacker with network access via multiple protocols to compromise
Java SE, Oracle GraalVM Enterprise Edition. Successful attacks
require human interaction from a person other than the attacker.
Successful attacks of this vulnerability can result in unauthorized
read access to a subset of 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 Java SE, Oracle GraalVM Enterprise Edition Java SE: 7u301,
8u291, 11.0.11, 16.0.1; Oracle GraalVM Enterprise Edition:
20.3.2, 21.1.0
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 - July 2021
https://www.oracle.com/security-alerts/cpujul2021.html
[2] Text Form of Oracle Critical Patch Update - July 2021 Risk Matrices
https://www.oracle.com/security-alerts/cpujul2021verbose.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
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On call after hours for member emergencies only.
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