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AUSCERT Security Bulletin
ASB-2023.0095
Oracle Systems Critical Patch Update
19 April 2023
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AusCERT Security Bulletin Summary
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Product: Oracle Solaris
Operating System: Solaris
Resolution: Patch/Upgrade
CVE Names: CVE-2023-22003 CVE-2023-21985 CVE-2023-21984
CVE-2023-21948 CVE-2023-21928 CVE-2023-21896
Comment: CVSS (Max): 7.8 CVE-2023-21948 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: Oracle
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
OVERVIEW
Multiple vulnerabilities have been identified in :
o Oracle Solaris, versions 10, 11
[1]
IMPACT
The vendor has provided the following information regarding the
vulnerabilities:
"This Critical Patch Update contains 6 new security patches for
Oracle Systems. None of these vulnerabilities may be remotely
exploitable without authentication, i.e., none may be exploited over
a network without requiring user credentials." [1]
"CVE-2023-21948
7.8 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
The supported version that is affected is 10. Easily exploitable
vulnerability allows low privileged attacker with logon to the
infrastructure where Oracle Solaris executes to compromise Oracle
Solaris. Successful attacks of this vulnerability can result in
takeover of Oracle Solaris.
Affects:
o Oracle Solaris 10
CVE-2023-21985
7.7 AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
Supported versions that are affected are 10 and 11. Easily
exploitable vulnerability allows high 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 and while the vulnerability is in
Oracle Solaris, attacks may significantly impact additional products
(scope change). Successful attacks of this vulnerability can result
in takeover of Oracle Solaris.
Affects:
o Oracle Solaris 10, 11
CVE-2023-21896
7.0 AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Supported versions that are affected are 10 and 11. Difficult to
exploit vulnerability allows low privileged attacker with logon to
the infrastructure where Oracle Solaris executes to compromise Oracle
Solaris. Successful attacks of this vulnerability can result in
takeover of Oracle Solaris.
Affects:
o Oracle Solaris 10, 11
CVE-2023-21984
6.5 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
The supported version that is affected is 11. Easily exploitable
vulnerability allows low privileged attacker with network access via
HTTP to compromise Oracle Solaris. 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-2023-22003
3.3 AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Supported versions that are affected are 10 and 11. Easily
exploitable vulnerability allows unauthenticated 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.
Affects:
o Oracle Solaris 10, 11
CVE-2023-21928
1.8 AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N
The supported version that is affected is 11. Difficult to exploit
vulnerability allows high 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.
Affects:
o Oracle Solaris 11" [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.
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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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