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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1497 USN-4931-1: Samba vulnerabilities 4 May 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Samba Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Increased Privileges -- Existing Account Denial of Service -- Existing Account Access Confidential Data -- Existing Account Unauthorised Access -- Existing Account Reduced Security -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-20254 CVE-2020-14383 CVE-2020-14323 CVE-2020-14318 Reference: ESB-2021.1481 ESB-2021.0266 ESB-2020.4436 ESB-2020.4143 ESB-2020.3755 Original Bulletin: https://ubuntu.com/security/notices/USN-4931-1 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4931-1: Samba vulnerabilities 03 May 2021 Several security issues were fixed in Samba. Releases o Ubuntu 14.04 ESM Packages o samba - SMB/CIFS file, print, and login server for Unix Details Steven French discovered that Samba incorrectly handled ChangeNotify permissions. A remote attacker could possibly use this issue to obtain file name information. ( CVE-2020-14318 ) Bas Alberts discovered that Samba incorrectly handled certain winbind requests. A remote attacker could possibly use this issue to cause winbind to crash, resulting in a denial of service. ( CVE-2020-14323 ) Francis Brosnan Blazquez discovered that Samba incorrectly handled certain invalid DNS records. A remote attacker could possibly use this issue to cause the DNS server to crash, resulting in a denial of service. ( CVE-2020-14383 ) Peter Eriksson discovered that Samba incorrectly handled certain negative idmap cache entries. This issue could result in certain users gaining unauthorized access to files, contrary to expected behaviour. ( CVE-2021-20254 ) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 o samba - 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11 Available with UA Infra or UA Desktop In general, a standard system update will make all the necessary changes. References o CVE-2020-14318 o CVE-2020-14323 o CVE-2020-14383 o CVE-2021-20254 Related notices o USN-4930-1 : samba o USN-4611-1 : samba - --------------------------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. 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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 iQIVAwUBYJB3EONLKJtyKPYoAQhHEg/5AZI27pPsNz5qn99i57iDIEjhW7K2vBsY S7DKGlZDz2NQLz3XQmpZS9m8OdClQLIHx/1GWaoNXXNyqZFQEOXkceKy6zdUxLwq pvrYyh9KTD2H/pYqgpA9JxO7x+jhARKW/gWl4Q4Ay/PujhnkfjkSZ2AYy3jbxynH TcJ6KuJR4JBsl+cT+TTYdfhzIJZ8LrcHFqBhGri3nZAwDbUOLNrNuAJwkfCE22Ei vnCO5kKNOM25yANqn3/LRL0GGmS314DXq/eKj8lY2rKc5Fxjsfb01Jta77SXaNmO THX0R6x7PsGFkQSDqQy4rBz1uwlrjibwURDO7zZ0z+LQJHI/4YPRLr9Xyogh86Ex lf3p0mxp8M5SFA7GcxfJN8gOdR7jCDy32DwXsYJvAM9ZCV5Fdk6xcV3yqoz82FaP x029eVGlwtDceGVt+XC1OJph/IBC5eMOkzwdwBpI5L1u5xXasJzAYw5I46A1LfHv MxXyLXoQ7NSSfraxKq8WheDLlVHSip9vNbvH9isA7ps4PEER26Vl2bxBV4hpul1Z xpod22yuu6OOVIG6QwVuE4THEXRyPQOenLsN8pKw18dg4Rt03lo7S0hIqwUp3+Ra rvMT1awpBDXS3xVCTyujiAGlMrPS1O1aj7s7AmfcMGAk0J9cznItGxzakADeehJ3 rMMKhBweNms= =sRJb -----END PGP SIGNATURE-----