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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.0044.2 Security Bulletin: Multiple vulnerabilities in Apache log4j affect IBM WebSphere Application Server (CVE-2021-45105, CVE-2021-44832) 10 January 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: WebSphere Application Server Publisher: IBM Operating System: IBM i AIX HP-UX Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-45105 CVE-2021-44832 Reference: ASB-2021.0244.6 Original Bulletin: https://www.ibm.com/support/pages/node/6538148 Revision History: January 10 2022: Vendor added references re temporary mitigation January 5 2022: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Multiple vulnerabilities in Apache log4j affect IBM WebSphere Application Server (CVE-2021-45105, CVE-2021-44832) Document Information Document number : 6538148 Modified date : 07 January 2022 Product : WebSphere Application Server Software version : 8.5, 9.0 Operating system(s): AIX HP-UX IBM i Linux Solaris Windows z/OS Edition : Advanced,Base,Developer,Enterprise,Express,Network Deployment,Single Server Summary There is a vulnerability in the Apache log4j library used by IBM WebSphere Application Server traditional in the Admin Console and UDDI Registry application. This has been addressed in IBM WebSphere Application Server by removing log4j from the Admin Console and UDDI Registry application. Vulnerability Details CVEID: CVE-2021-45105 DESCRIPTION: Apache Log4j is vulnerable to a denial of service, caused by the failure to protect from uncontrolled recursion from self-referential lookups. A remote attacker with control over Thread Context Map (MDC) input data could craft malicious input data that contains a recursive lookup to cause a StackOverflowError that will terminate the process. Note: The vulnerability is also called LOG4J2-3230. CVSS Base score: 7.5 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/ 215647 for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVEID: CVE-2021-44832 DESCRIPTION: Apache Log4j could allow a remote attacker with permission to modify the logging configuration file to execute arbitrary code on the system. By constructing a malicious configuration using a JDBC Appender with a data source referencing a JNDI URI , an attacker could exploit this vulnerability to execute remote code. CVSS Base score: 6.6 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/ 216189 for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H) Affected Products and Versions +----------------------------+----------+ |Affected Product(s) |Version(s)| +----------------------------+----------+ |WebSphere Application Server|9.0 | +----------------------------+----------+ |WebSphere Application Server|8.5 | +----------------------------+----------+ Remediation/Fixes The recommended solution is to apply the interim fix, Fix Pack or PTF containing the APAR PH42762 for each named product as soon as possible. The interim fix PH42762 was provided previously with Security Bulletin: Multiple vulnerabilities in Apache log4j affect the IBM WebSphere Application Server and IBM WebSphere Application Server Liberty (CVE-2021-4104, CVE-2021-45046) and the interim fix PH42762 addresses these vulnerabilities for the affected IBM WebSphere Application Server 8.5 and 9.0 versions. Note: IBM WebSphere Application Server 7.0, 8.0 and IBM WebSphere Application Server Liberty are not affected. For WebSphere Application Server traditional: For V9.0.0.0 through 9.0.5.10: . Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH42762 - --OR-- . Apply Fix Pack 9.0.5.11 or later (when available). For V8.5.0.0 through 8.5.5.20: . Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH42762 - --OR-- . Apply Fix Pack 8.5.5.21 or later (when available). Additional interim fixes may be available and linked off the interim fix download page. Workarounds and Mitigations If the interim fixes in PH42762 cannot be applied immediately, and the mitigation steps have not been applied previously for Security Bulletin: Multiple vulnerabilities in Apache log4j affect the IBM WebSphere Application Server and IBM WebSphere Application Server Liberty (CVE-2021-4104, CVE-2021-45046) , then follow the temporary mitigation steps for WebSphere Application Server traditional in Security Bulletin: Multiple vulnerabilities in Apache log4j affect the IBM WebSphere Application Server and IBM WebSphere Application Server Liberty (CVE-2021-4104, CVE-2021-45046) . Due to the severity, complexity, and evolving nature of the situation, no mitigation is recommended as a substitute for patching. Security Bulletin: Multiple vulnerabilities in Apache log4j affect the IBM WebSphere Application Server and IBM WebSphere Application Server Liberty (CVE-2021-4104, CVE-2021-45046) Acknowledgement Change History 04 Jan 2022: Initial Publication 07 Jan 2022: Added reference to temporary mitigation - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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