Ubuntu alert USN-5142-1 (samba)
| From: | Marc Deslauriers <marc.deslauriers@canonical.com> | |
| To: | ubuntu-security-announce@lists.ubuntu.com | |
| Subject: | [USN-5142-1] Samba vulnerabilities | |
| Date: | Thu, 11 Nov 2021 08:11:03 -0500 | |
| Message-ID: | <62abfb90-b2ce-41b5-daa6-3ef08df1062e@canonical.com> |
========================================================================== Ubuntu Security Notice USN-5142-1 November 11, 2021 samba vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 21.10 - Ubuntu 21.04 - Ubuntu 20.04 LTS Summary: Several security issues were fixed in Samba. Software Description: - samba: SMB/CIFS file, print, and login server for Unix Details: Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client connections. A remote attacker could possibly use this issue to downgrade connections to plaintext authentication. (CVE-2016-2124) Andrew Bartlett discovered that Samba incorrectly mapping domain users to local users. An authenticated attacker could possibly use this issue to become root on domain members. (CVE-2020-25717) Andrew Bartlett discovered that Samba did not correctly sandbox Kerberos tickets issues by an RODC. An RODC could print administrator tickets, contrary to expectations. (CVE-2020-25718) Andrew Bartlett discovered that Samba incorrectly handled Kerberos tickets. Delegated administrators could possibly use this issue to impersonate accounts, leading to total domain compromise. (CVE-2020-25719) Andrew Bartlett discovered that Samba did not provide stable AD identifiers to Kerberos acceptors. (CVE-2020-25721) Andrew Bartlett discovered that Samba did not properly check sensitive attributes. An authenticated attacker could possibly use this issue to escalate privileges. (CVE-2020-25722) Stefan Metzmacher discovered that Samba incorrectly handled certain large DCE/RPC requests. A remote attacker could possibly use this issue to bypass signature requirements. (CVE-2021-23192) William Ross discovered that Samba incorrectly handled memory. A remote attacker could use this issue to cause Samba to crash, resulting in a denial of service, or possibly escalate privileges. (CVE-2021-3738) Joseph Sutton discovered that Samba incorrectly handled certain TGS requests. An authenticated attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2021-3671) The fix for CVE-2020-25717 results in possible behaviour changes that could affect certain environments. Please see the upstream advisory for more information: https://www.samba.org/samba/security/CVE-2020-25717.html Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 21.10: samba 2:4.13.14+dfsg-0ubuntu0.21.10.1 Ubuntu 21.04: samba 2:4.13.14+dfsg-0ubuntu0.21.04.1 Ubuntu 20.04 LTS: samba 2:4.13.14+dfsg-0ubuntu0.20.04.1 This update uses a new upstream release, which includes additional bug fixes. In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-5142-1 CVE-2016-2124, CVE-2020-25717, CVE-2020-25718, CVE-2020-25719, CVE-2020-25721, CVE-2020-25722, CVE-2021-23192, CVE-2021-3671, CVE-2021-3738 Package Information: https://launchpad.net/ubuntu/+source/samba/2:4.13.14+dfsg... https://launchpad.net/ubuntu/+source/samba/2:4.13.14+dfsg... https://launchpad.net/ubuntu/+source/samba/2:4.13.14+dfsg... -- ubuntu-security-announce mailing list ubuntu-security-announce@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-security...