20 December 2021
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.4309 USN-5203-1: Apache Log4j 2 vulnerability 20 December 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: apache-log4j2 Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-45105 Reference: ASB-2021.0244.5 Original Bulletin: https://ubuntu.com/security/notices/USN-5203-1 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-5203-1: Apache Log4j 2 vulnerability 19 December 2021 Apache Log4j 2 could be made to crash if it received specially crafted input. Releases o Ubuntu 21.10 o Ubuntu 21.04 o Ubuntu 20.04 LTS Packages o apache-log4j2 - Apache Log4j - Logging Framework for Java Details Hideki Okamoto and Guy Lederfein discovered that Apache Log4j 2 did not protect against infinite recursion in lookup evaluation. A remote attacker could possibly use this issue to cause Apache Log4j 2 to crash, leading to a denial of service. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 21.10 o liblog4j2-java - 2.17.0-0.21.10.1 Ubuntu 21.04 o liblog4j2-java - 2.17.0-0.21.04.1 Ubuntu 20.04 o liblog4j2-java - 2.17.0-0.20.04.1 In general, a standard system update will make all the necessary changes. References o CVE-2021-45105 - --------------------------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 email@example.com 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. 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. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: firstname.lastname@example.org 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 iQIVAwUBYb/ClONLKJtyKPYoAQhxmBAAm3Ljbc1SzrEsPKQ8wt0fjImC4MEaxp1d en4aHGx5QvJrj3u3CNNDL13mz2sMASgXhLP/uIf1Hz1ozUgETk+pjQINAEGVAr11 yB21Y00qsaZuj0G93noWdHr3Ihem82YbX7wqre1v4GK9NlFKiugVxMWLW5XcpkS+ 2XT390mE8BHZlHCTvQnUpe8n7b5kkg63Z8TbZ/bgLLqmzrWCys0hsAQFQuCNm72G 1XBUOMsOJP3n7hNs4ZfskJSXL3FqOyWJVuxYHgd279RHRR3wiCUs/FNAjvKnZ2tB qKYUIKDKdMVU1H4aDcdgxLQ9jhq3e4C7sSjtdGYGyOzMjiTXGhLKSc35eD1mmbti 4WBUDUB6xU8ptpHQ2KH4888kfJsDZ5T0AxjHp+mrOEme4iwwcS6Kfkvp2JtjbwKb g3e9zDxY2TVUcYqZ8Wj5UnCg8Sw47/0/RQcKslbmcBPmZqimFHXk4YhC3Cm7M93J ICelkxuC1qEhkzQzR0KPy7wGrfCQ1HLqM3QGxWfRCPP3O2g25z1b4/CGGcY0dv9H v3qhADZlGrix3Zq5emOlVEm13VAbxrAZEmWwQssJDmG8h+xZnC7peDgccvZQmgN4 IHuu+wyACnaH5ZgvhZcH33TtzKy2oO9G7hw0csLQCIGg5ZFKXclQVAp7aNdbknNf lh5N8/7cAdE= =U0Ab -----END PGP SIGNATURE-----