========================================================================== Ubuntu Security Notice USN-4931-1 May 03, 2021 samba vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 14.04 ESM Summary: Several security issues were fixed in Samba. Software Description: - 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 Blázquez 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 ESM: samba 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-4931-1 CVE-2020-14318, CVE-2020-14323, CVE-2020-14383, CVE-2021-20254