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AUSCERT Security Bulletin
ASB-2021.0218.2
Oracle Systems Critical Patch Update
20 October 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Oracle Ethernet Switch ES2-64
Oracle Solaris
Oracle ZFS Storage Appliance Kit
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Modify Arbitrary Files -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-35589 CVE-2021-35549 CVE-2021-35539
CVE-2021-26691 CVE-2020-1968
Reference: ASB-2021.0205
ASB-2021.0028
ESB-2021.3431
ESB-2021.3373
ESB-2021.2097
ESB-2020.3170
Revision History: October 20 2021: Tag management
October 20 2021: Initial Release
OVERVIEW
Multiple vulnerabilities have been identified in :
o Oracle Ethernet Switch ES2-64, Oracle Ethernet Switch ES2-72,
version 2.0.0.14
o Oracle Solaris, version 11
o Oracle ZFS Storage Appliance Kit, version 8.8
[1]
IMPACT
The vendor has provided the following information regarding the
vulnerabilities:
"This Critical Patch Update contains 5 new security patches for
Oracle Systems. 2 of these vulnerabilities may be remotely
exploitable without authentication, i.e., may be exploited over a
network without requiring user credentials." [1]
CVE-2021-26691
9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The supported version that is affected is 8.8. Easily exploitable
vulnerability allows unauthenticated attacker with network access via
multiple protocols to compromise Oracle ZFS Storage Appliance Kit.
Successful attacks of this vulnerability can result in takeover of
Oracle ZFS Storage Appliance Kit.
Affects:
o Oracle ZFS Storage Appliance Kit 8.8
CVE-2021-35539
6.5 AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
The supported version that is affected is 11. Easily exploitable
vulnerability allows low privileged attacker with logon to the
infrastructure where Oracle Solaris executes to compromise Oracle
Solaris. While the vulnerability is in Oracle Solaris, attacks may
significantly impact additional products. Successful attacks of this
vulnerability can result in unauthorized ability to cause a hang or
frequently repeatable crash (complete DOS) of Oracle Solaris.
Affects:
o Oracle Solaris 11
CVE-2021-35589
6.0 AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
The supported version that is affected is 11. Easily exploitable
vulnerability allows high privileged attacker with logon to the
infrastructure where Oracle Solaris executes to compromise Oracle
Solaris. While the vulnerability is in Oracle Solaris, attacks may
significantly impact additional products. Successful attacks of this
vulnerability can result in unauthorized ability to cause a hang or
frequently repeatable crash (complete DOS) of Oracle Solaris.
Affects:
o Oracle Solaris 11
CVE-2021-35549
3.9 AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L
The supported version that is affected is 11. Easily exploitable
vulnerability allows low privileged attacker with logon to the
infrastructure where Oracle Solaris executes to compromise Oracle
Solaris. 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
Oracle Solaris accessible data and unauthorized ability to cause a
partial denial of service (partial DOS) of Oracle Solaris.
Affects:
o Oracle Solaris 11
CVE-2020-1968
3.7 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
The supported version that is affected is 2.0.0.14. Difficult to
exploit vulnerability allows unauthenticated attacker with network
access via HTTPS to compromise Oracle Ethernet Switch ES2-64, Oracle
Ethernet Switch ES2-72. Successful attacks of this vulnerability can
result in unauthorized read access to a subset of Oracle Ethernet
Switch ES2-64, Oracle Ethernet Switch ES2-72 accessible data.
Affects:
o Oracle Ethernet Switch ES2-64, Oracle Ethernet Switch ES2-72
2.0.0.14
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 - October 2021
https://www.oracle.com/security-alerts/cpuoct2021.html
[2] Text Form of Oracle Critical Patch Update - October 2021 Risk
Matrices
https://www.oracle.com/security-alerts/cpuoct2021verbose.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.
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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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