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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT Security Bulletin ASB-2021.0076 Oracle Java SE Critical Patch Update 21 April 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Oracle GraalVM Enterprise Edition Oracle Java SE Oracle Java SE Embedded Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Modify Arbitrary Files -- Remote with User Interaction Denial of Service -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-23841 CVE-2021-3450 CVE-2021-2163 CVE-2021-2161 Reference: ASB-2021.0065 ESB-2021.1342 ESB-2021.0701 ESB-2021.0670 OVERVIEW Multiple vulnerabilities have been identified in : o Oracle GraalVM Enterprise Edition, versions 19.3.5, 20.3.1.2, 21.0.0.2 o Oracle Java SE, versions 7u291, 8u281, 11.0.10, 16 o Oracle Java SE Embedded, version 8u281 [1] IMPACT The vendor has provided the following information regarding the vulnerabilities: "This Critical Patch Update contains 4 new security patches for Oracle Java SE. All of these vulnerabilities may be remotely exploitable without authentication, i.e., may be exploited over a network without requiring user credentials." [1] CVE-2021-23841 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Supported versions that are affected are Oracle GraalVM Enterprise Edition: 19.3.5, 20.3.1.2 and 21.0.0.2. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTPS 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: 19.3.5, 20.3.1.2, 21.0.0.2 CVE-2021-3450 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 GraalVM Enterprise Edition: 19.3.5, 20.3.1.2 and 21.0.0.2. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTPS to compromise Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle GraalVM Enterprise Edition accessible data as well as unauthorized access to critical data or complete access to all Oracle GraalVM Enterprise Edition accessible data. Affects: o Oracle GraalVM Enterprise Edition Oracle GraalVM Enterprise Edition: 19.3.5, 20.3.1.2, 21.0.0.2 CVE-2021-2161 5.9 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N Supported versions that are affected are Java SE: 7u291, 8u281, 11.0.10, 16; Java SE Embedded: 8u281; Oracle GraalVM Enterprise Edition: 19.3.5, 20.3.1.2 and 21.0.0.2. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Java SE, Java SE Embedded, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Java SE, Java SE Embedded, Oracle GraalVM Enterprise Edition accessible data. Note : This vulnerability applies to Java deployments that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. It can also be exploited by supplying untrusted data to APIs in the specified Component. Affects: o Java SE, Java SE Embedded, Oracle GraalVM Enterprise Edition Java SE: 7u291, 8u281, 11.0.10, 16; Java SE Embedded: 8u281; Oracle GraalVM Enterprise Edition: 19.3.5, 20.3.1.2, 21.0.0.2 CVE-2021-2163 5.3 AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N Supported versions that are affected are Java SE: 7u291, 8u281, 11.0.10, 16; Java SE Embedded: 8u281; Oracle GraalVM Enterprise Edition: 19.3.5, 20.3.1.2 and 21.0.0.2. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Java SE, Java SE Embedded, 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 creation, deletion or modification access to critical data or all Java SE, Java SE Embedded, Oracle GraalVM Enterprise Edition accessible data. Note : This vulnerability applies to Java deployments that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. Affects: o Java SE, Java SE Embedded, Oracle GraalVM Enterprise Edition Java SE: 7u291, 8u281, 11.0.10, 16; Java SE Embedded: 8u281; Oracle GraalVM Enterprise Edition: 19.3.5, 20.3.1.2, 21.0.0.2 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 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. =========================================================================== 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. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYH+dJONLKJtyKPYoAQj8sA//VDWhpzMCOFySR+7jGneiZkVkspLQ8zuu Zx5EkWAfwk6v58K5FKuQ+KGvo3EzouZUJKRxHhX07HNGkAxnihI1EEVTVp0q8jxx bKIs2wfkRQdwwYufUsD3rn/uRCUCnCU7ksGImttLloT+GcB48+akzzJSvvr2YWoG 351ziJwmvdcmUCh0ZSjl7AmkssLunxh+TibOZ8zMzSS+X6NFtuuV43Y+E0fkAoc4 E2z3Es50WXtzTQqFRt9+qsgkJtAJF908+pjEu+9RS7oxz3K4LTskUsZrCa1xUVsc SXbT7XHBGTxLYft7iDuejsTdCxF/hLQn9RnlhrEDNC4r3IvxNKNJXFjMu9qw+p4W De1nLYqGqtkChwIKaKgVx5p8r526MboYSJherKSbisVn1rjdaEP5XR1U+KHh9Eo9 PUKDsxwXUX4gDrcyaAJn8IpJBT9JriCtef6cFSKa9JMMjDYT2v7uNHYaJvTpq5NR C2ayj0DBrNxHk/JVopn2+LhHcQPscQBwqiV+54MNotLuBsS+/AkJ+JLvT4BZMfWC gNimvoiHqzy294VRvO5yNajLjo74rNuQD3wlxiLIMMTSHpee4hglK/b/3Oy9Km7i fCvpqh0QThlHG9bE3VooKh4+zZa5KYg8lrCz1fteSC78h2iBM7E3I54rSX2jNxXU NcaGny59+hQ= =IDS6 -----END PGP SIGNATURE-----