Protect yourself against future threats.
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AUSCERT Security Bulletin
ASB-2021.0095
Oracle REST Data Services Critical Patch Update
21 April 2021
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AusCERT Security Bulletin Summary
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Product: Oracle REST Data Services
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-27223
Reference: ESB-2021.1017
OVERVIEW
Multiple vulnerabilities have been identified in :
o Oracle REST Data Services, versions prior to 20.4.3.50.1904
[1]
IMPACT
The vendor has provided the following information regarding the
vulnerabilities:
"This Critical Patch Update contains 1 new security patch plus
additional third party patches noted below for Oracle REST Data
Services. This vulnerability is remotely exploitable without
authentication, i.e., may be exploited over a network without
requiring user credentials." [1]
CVE-2020-27223
5.3 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
The supported version that is affected is Prior to 20.4.3.050.1904.
Easily exploitable vulnerability allows unauthenticated attacker with
network access via HTTP to compromise Oracle REST Data Services.
Successful attacks of this vulnerability can result in unauthorized
ability to cause a partial denial of service (partial DOS) of Oracle
REST Data Services.
Affects:
o Oracle REST Data Services Prior to 20.4.3.050.1904
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 2021
https://www.oracle.com/security-alerts/cpuapr2021.html
[2] Text Form of Oracle Critical Patch Update - April 2021 Risk
Matrices
https://www.oracle.com/security-alerts/cpuapr2021verbose.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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