Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1818 USN-4968-1: LZ4 vulnerability 27 May 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: LZ4 Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-3520 Reference: ESB-2021.1748 ESB-2021.1661 Original Bulletin: https://ubuntu.com/security/notices/USN-4968-1 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4968-1: LZ4 vulnerability 26 May 2021 LZ4 could be made to crash or run programs if it opened a specially crafted file. Releases o Ubuntu 21.04 o Ubuntu 20.10 o Ubuntu 20.04 LTS o Ubuntu 18.04 LTS Packages o lz4 - Extremely fast compression algorithm Details It was discovered that LZ4 incorrectly handled certain memory operations. If a user or automated system were tricked into uncompressing a specially- crafted LZ4 file, a remote attacker could use this issue to cause LZ4 to crash, resulting in a denial of service, or possibly execute arbitrary code. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 21.04 o liblz4-1 - 1.9.3-1ubuntu0.1 Ubuntu 20.10 o liblz4-1 - 1.9.2-2ubuntu0.20.10.1 Ubuntu 20.04 o liblz4-1 - 1.9.2-2ubuntu0.20.04.1 Ubuntu 18.04 o liblz4-1 - 0.0~r131-2ubuntu3.1 In general, a standard system update will make all the necessary changes. References o CVE-2021-3520 - --------------------------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. 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: 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 iQIVAwUBYK8D7eNLKJtyKPYoAQhlYQ//WoF5BdLd0rV+E3VviXJOW5ZRghxh0DCG hrAxvbrdvN6z7ixhjyJzkqkg6qUJbcJR6/MKtEXhyMDzu0LH3wbIlAvbVjcK/XQB oJFDcwyjrCGpZlJVDtQCF7eKLeWxMU6i1F2rac+MIYSc+RT1M8HdVMspxd8aG9YQ eORY8NNUg5d/0G1zqr4AArTe5H/ikxTisauWf0AG+8gekoOQykjT3SMKQ1BbUaIl Y90tWgPvgCzBbpP6+0P2qr8cen4byS6dIAKo+Mvah5uvNAODb16FpNk6lxoULLpc 8WY10lM/06qqgWLprLnhDa7E/S/4KVVBXDCgJlHoukX/R1dtO6gP1d7a1Fl7XgnL +RfzVDteLOIcFO0JL9S8SyjpqXXo9YJRRhqs0x+lyFvK9YlonErs2YbSywQBbxsn lI0nTDeoZNFMAf60CVX5Xi8OGCD4LoIJhqPuSxpwIikXrZDNWzGnp5fXAwJlSIh+ 2XgqDMTMCSyUKocg3wcHg6Z62IXVomcL4D6l+064+v+DiFwwHxR/mx34n9oABGGa vijDb1STLBCrJgKxW0Udv4FZU0QR68F51KSGG+qJut9vAS25K1JoPnrCNr8EJljx VL+dqrPbesA+2XMD/fHeOqReQmKPgpFPLMDv1Wip9QlMHYUPc8uWd9+3H57Z359q Lv3ObcDr+bU= =MLxG -----END PGP SIGNATURE-----